diff --git a/.opencode/scripts/project-status.py b/.opencode/scripts/project-status.py
index 1eef4a9..a6b2a12 100644
--- a/.opencode/scripts/project-status.py
+++ b/.opencode/scripts/project-status.py
@@ -31,6 +31,8 @@ from __future__ import annotations
 
 import argparse
 import ast
+import importlib.util
+import json
 import re
 import subprocess
 import sys
@@ -40,6 +42,12 @@ from enum import StrEnum
 from pathlib import Path
 from typing import Any
 
+# Load project_contract.py via importlib.util (no sys.path mutation).
+_contract_path = Path(__file__).resolve().parent / "project_contract.py"
+_pc_spec = importlib.util.spec_from_file_location("project_contract", _contract_path)
+project_contract = importlib.util.module_from_spec(_pc_spec)  # type: ignore[arg-type]
+_pc_spec.loader.exec_module(project_contract)  # type: ignore[union-attr]
+
 # ── repo root + config ─────────────────────────────────────────────────────────
 
 
@@ -67,6 +75,7 @@ DEFAULT_CONFIG: dict[str, Any] = {
     "route_line_limit": 50,
     "min_test_count": 1,
     "require_branch_protection": False,
+    "no_db": False,
 }
 
 
@@ -75,6 +84,10 @@ def load_config(root: Path | None = None) -> dict[str, Any]:
 
     Falls back to ``DEFAULT_CONFIG`` if the section or file is missing.
     Uses ``tomllib`` (stdlib, Python 3.11+). Reads only — never writes.
+
+    Supports ``no_db: bool`` — when true, BACKEND skips the ``db/models``
+    structure check (cookiecutter ``use_db=no`` writes this marker in
+    ``post_gen_project.py``).
     """
     base = root if root is not None else REPO_ROOT
     cfg: dict[str, Any] = dict(DEFAULT_CONFIG)
@@ -109,15 +122,9 @@ class CheckStatus(StrEnum):
     FAIL = "FAIL"
 
 
-class ProjectType(StrEnum):
-    """Auto-detected project type."""
-
-    FULLSTACK = "fullstack"
-    BACKEND = "backend"
-    CLI = "cli"
-    BOT = "bot"
-    WORKER = "worker"
-    UNKNOWN = "unknown"
+# Re-exported from project_contract.py for backward compatibility
+# (tests use ``ps.ProjectType.X``).
+ProjectType = project_contract.ProjectType
 
 
 @dataclass(frozen=True)
@@ -303,24 +310,20 @@ def detect_project_type(ctx: RepoCtx | None = None) -> ProjectType:
 # ── expected structure per type ──────────────────────────────────────────────
 
 
-STRUCTURE_EXPECTED: dict[ProjectType, list[str]] = {
-    # BACKEND is resolved dynamically by ``_expected_backend_paths`` — the
-    # paths are ``src/<package_name>/...`` where ``<package_name>`` comes from
-    # ``[project].name`` normalized (``my-project`` → ``my_project``).
-    ProjectType.FULLSTACK: ["backend", "frontend"],
-    ProjectType.CLI: ["src"],  # src/<package>/ — checked generically
-    ProjectType.BOT: ["src/bot.py"],
-    ProjectType.WORKER: ["src/flow.py"],
-    ProjectType.UNKNOWN: [],
-}
+# Re-exported from project_contract.py for backward compatibility
+# (tests use ``ps.STRUCTURE_EXPECTED``).
+STRUCTURE_EXPECTED: dict[str, list[str]] = project_contract.STRUCTURE_EXPECTED
 
 
-def _expected_backend_paths(pkg: str) -> list[str]:
+def _expected_backend_paths(pkg: str, no_db: bool = False) -> list[str]:
     """Return the nested ``src/<package>/`` structure for the backend type.
 
     ``pkg`` is the normalized ``[project].name`` (``my-project`` → ``my_project``).
+    When ``no_db`` is true (``[tool.project-status] no_db = true`` in
+    pyproject.toml), ``db/models`` is excluded from the expected paths —
+    cookiecutter ``use_db=no`` removes the ``db/`` dir.
     """
-    return [
+    paths = [
         f"src/{pkg}/api/v1",
         f"src/{pkg}/db/models",
         f"src/{pkg}/schemas",
@@ -328,6 +331,9 @@ def _expected_backend_paths(pkg: str) -> list[str]:
         f"src/{pkg}/config/settings.py",
         "main.py",
     ]
+    if no_db:
+        paths.pop(1)  # remove ``src/<pkg>/db/models``
+    return paths
 
 
 # ── README delimiter tags (12) — ported from create-readme.ts:140-199 ───────
@@ -533,16 +539,65 @@ def _check_scattered_models(ctx: RepoCtx, ptype: ProjectType) -> list[CheckResul
     return results
 
 
+def _check_frontend_stack(ctx: RepoCtx) -> CheckResult | None:
+    """Fullstack frontend stack detection: tailwindcss + bits-ui in
+    ``frontend/package.json`` deps + ``components.json`` + ``tsconfig.json``
+    existence (4 markers).
+
+    Returns ``None`` if ``frontend/package.json`` does not exist (caller
+    surfaces the missing-package.json WARN separately). Returns a WARN
+    ``CheckResult`` listing the missing markers when any are absent. Returns
+    ``None`` (no CheckResult) when all 4 markers are present — the caller
+    emits an OK in the structure loop is not needed; we return ``None`` so
+    nothing extra is appended, keeping the structure group clean.
+
+    Actually: returns an OK ``CheckResult`` when all markers present, so the
+    audit explicitly confirms the frontend stack is up-to-date.
+    """
+    pkg_path = ctx.root / "frontend" / "package.json"
+    if not pkg_path.exists():
+        return None  # surfaced by the existing ``frontend/package.json`` check
+    required_deps = project_contract.FRONTEND_STACK_MARKERS["fullstack_package_deps"]
+    required_files = project_contract.FRONTEND_STACK_MARKERS["fullstack_files"]
+    missing: list[str] = []
+    try:
+        pkg = json.loads(pkg_path.read_text(encoding="utf-8-sig"))
+    except (json.JSONDecodeError, OSError):
+        missing.extend(f"{d} in package.json" for d in required_deps)
+        pkg = {}
+    if not missing:
+        deps = {**pkg.get("dependencies", {}), **pkg.get("devDependencies", {})}
+        for dep in required_deps:
+            if dep not in deps:
+                missing.append(dep)
+    for rel in required_files:
+        if not (ctx.root / rel).exists():
+            missing.append(rel)
+    if missing:
+        return CheckResult(
+            CheckStatus.WARN,
+            "frontend stack",
+            "frontend stack outdated: missing "
+            + ", ".join(missing)
+            + ". Fullstack cookiecutter template includes Tailwind v4 + shadcn-svelte + TS.",
+        )
+    return CheckResult(CheckStatus.OK, "frontend stack", "Tailwind + shadcn-svelte + TS detected")
+
+
 def _check_type_specific_structure(ptype: ProjectType, ctx: RepoCtx) -> list[CheckResult]:
     """Type-specific extra checks beyond the expected dirs list."""
     results: list[CheckResult] = []
     if ptype == ProjectType.BACKEND:
         results.append(_check_backend_lifespan(ctx))
-    elif ptype == ProjectType.FULLSTACK and not path_exists("frontend/package.json", ctx):
+    if ptype == ProjectType.FULLSTACK and not path_exists("frontend/package.json", ctx):
         results.append(
             CheckResult(CheckStatus.WARN, "frontend/package.json", "SvelteKit не обнаружен")
         )
-    elif ptype == ProjectType.CLI:
+    if ptype == ProjectType.FULLSTACK:
+        frontend_stack = _check_frontend_stack(ctx)
+        if frontend_stack is not None:
+            results.append(frontend_stack)
+    if ptype == ProjectType.CLI:
         results.append(_check_cli_package(ctx))
     flat = _check_flat_layout(ptype, ctx)
     if flat is not None:
@@ -565,9 +620,10 @@ def check_structure(ptype: ProjectType, ctx: RepoCtx) -> GroupResult:
                 )
             )
             return group
-        expected = _expected_backend_paths(pkg)
+        no_db = bool(ctx.config.get("no_db", False))
+        expected = _expected_backend_paths(pkg, no_db=no_db)
     else:
-        expected = STRUCTURE_EXPECTED.get(ptype, [])
+        expected = STRUCTURE_EXPECTED.get(ptype.value, [])
     if not expected:
         group.checks.append(
             CheckResult(CheckStatus.WARN, "auto-detect", f"тип={ptype.value}: нет контракта")
diff --git a/.opencode/scripts/project_contract.py b/.opencode/scripts/project_contract.py
new file mode 100644
index 0000000..9df4a30
--- /dev/null
+++ b/.opencode/scripts/project_contract.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+"""Project contract: single source of truth for project types, stacks,
+expected structure, frontend markers and no_db support.
+
+Imported by both ``spec-status.py`` and ``project-status.py`` via
+``importlib.util.spec_from_file_location`` (no ``sys.path`` mutation).
+Stdlib-only imports.
+
+Contract symbols:
+    ProjectType              — StrEnum with 7 members (incl. MCP_SERVER + UNKNOWN)
+    VALID_TYPES              — set[str] excluding "unknown"
+    STACK_REQUIRED           — dict[type -> list[str]] of mandatory stack items
+    STRUCTURE_EXPECTED       — dict[type -> list[str]] of expected top-level dirs/files
+    FRONTEND_STACK_MARKERS   — dict with keys for fullstack frontend detection
+    NO_DB_SUPPORTED          — set[str] of types that support no_db=true
+"""
+
+from __future__ import annotations
+
+from enum import StrEnum
+
+
+class ProjectType(StrEnum):
+    """Project type enum (auto-detected or spec-declared)."""
+
+    FULLSTACK = "fullstack"
+    BACKEND = "backend"
+    CLI = "cli"
+    BOT = "bot"
+    WORKER = "worker"
+    MCP_SERVER = "mcp-server"
+    UNKNOWN = "unknown"
+
+
+# Excludes "unknown" — used by spec-status PROJECT_TYPE phase validation.
+VALID_TYPES: set[str] = {t.value for t in ProjectType if t != ProjectType.UNKNOWN}
+
+# Mandatory stack items per project type (spec-status Phase 2 STACK).
+# `uv` stays in ALL stacks (build-tool, mentioned in stack.md).
+STACK_REQUIRED: dict[str, list[str]] = {
+    "backend": ["fastapi", "tortoise", "uv", "pytest", "ruff", "mypy", "loguru", "pydantic"],
+    "fullstack": [
+        "fastapi",
+        "tortoise",
+        "svelte",
+        "sveltekit",
+        "biome",
+        "uv",
+        "ruff",
+        "mypy",
+        "pytest",
+        "tailwind",
+        "shadcn",
+        "typescript",
+    ],
+    "mcp-server": ["fastapi", "mcp", "patchright", "uv"],
+    "cli": ["typer", "uv", "hatchling", "ruff", "mypy", "pytest"],
+    "bot": ["aiogram", "fastapi", "uv", "ruff", "mypy", "pytest"],
+    "worker": ["prefect", "uv", "ruff", "mypy", "pytest"],
+}
+
+# Expected top-level structure per type (project-status check_structure).
+# BACKEND is resolved dynamically by ``_expected_backend_paths`` (src/<pkg>/...),
+# so it is NOT in this dict. mcp-server structure is TBD out of scope.
+# Keys are strings (project type values), NOT ProjectType enum members —
+# kept as plain strings for portability across both oracles.
+STRUCTURE_EXPECTED: dict[str, list[str]] = {
+    "fullstack": ["backend", "frontend"],
+    "cli": ["src"],  # src/<package>/ — checked generically
+    "bot": ["src/bot.py"],
+    "worker": ["src/flow.py"],
+    "unknown": [],
+}
+
+# Fullstack frontend stack markers (project-status _check_type_specific_structure).
+# `tailwindcss` + `bits-ui` (shadcn-svelte proxy) in package.json deps, plus
+# `components.json` (shadcn config) and `tsconfig.json` (TypeScript) existence.
+FRONTEND_STACK_MARKERS: dict[str, list[str]] = {
+    "fullstack_package_deps": ["tailwindcss", "bits-ui"],
+    "fullstack_files": ["frontend/components.json", "frontend/tsconfig.json"],
+}
+
+# Project types that support ``[tool.project-status] no_db = true`` in
+# pyproject.toml (skip ``db/models`` check). Backend is the primary case;
+# fullstack is included for completeness (latent — _check_scattered_models
+# already early-returns when db/models absent).
+NO_DB_SUPPORTED: set[str] = {"backend", "fullstack"}
diff --git a/.opencode/scripts/spec-status.py b/.opencode/scripts/spec-status.py
index 723955e..70c7e94 100644
--- a/.opencode/scripts/spec-status.py
+++ b/.opencode/scripts/spec-status.py
@@ -37,6 +37,7 @@ Nine phases:
 from __future__ import annotations
 
 import functools
+import importlib.util
 import re
 import subprocess
 import sys
@@ -44,6 +45,12 @@ from dataclasses import dataclass
 from enum import StrEnum
 from pathlib import Path
 
+# Load project_contract.py via importlib.util (no sys.path mutation).
+_contract_path = Path(__file__).resolve().parent / "project_contract.py"
+_pc_spec = importlib.util.spec_from_file_location("project_contract", _contract_path)
+project_contract = importlib.util.module_from_spec(_pc_spec)  # type: ignore[arg-type]
+_pc_spec.loader.exec_module(project_contract)  # type: ignore[union-attr]
+
 
 def _resolve_repo_root() -> Path:
     """Resolve repo root via git (cwd-aware), fallback to script location."""
@@ -67,29 +74,10 @@ PHASE_FILES: dict[int, str] = {
     6: "roadmap.md",
 }
 
-VALID_TYPES = {"backend", "fullstack", "mcp-server", "cli", "bot", "worker"}
-
-STACK_REQUIRED: dict[str, list[str]] = {
-    "backend": ["fastapi", "tortoise", "uv", "pytest", "ruff", "mypy", "loguru", "pydantic"],
-    "fullstack": [
-        "fastapi",
-        "tortoise",
-        "svelte",
-        "sveltekit",
-        "biome",
-        "uv",
-        "ruff",
-        "mypy",
-        "pytest",
-        "tailwind",
-        "shadcn",
-        "typescript",
-    ],
-    "mcp-server": ["fastapi", "mcp", "patchright", "uv"],
-    "cli": ["typer", "uv", "hatchling", "ruff", "mypy", "pytest"],
-    "bot": ["aiogram", "fastapi", "uv", "ruff", "mypy", "pytest"],
-    "worker": ["prefect", "uv", "ruff", "mypy", "pytest"],
-}
+# Re-exported from project_contract.py for backward compatibility
+# (tests use ``ss.VALID_TYPES`` / ``ss.STACK_REQUIRED``).
+VALID_TYPES = project_contract.VALID_TYPES
+STACK_REQUIRED = project_contract.STACK_REQUIRED
 
 PHASE_NAMES = [
     "DETECT",
@@ -254,8 +242,13 @@ def check_stack() -> PhaseResult:
         return PhaseResult(PhaseStatus.NOT_DONE, "docs/spec/stack.md не заполнен")
     required = STACK_REQUIRED[ptype]
     stack_body = stack_file.read_text()
-    stack_lower = stack_body.lower()
-    missing = [item for item in required if item not in stack_lower]
+    # Word-boundary regex: ``uv`` does NOT match ``uvicorn``, ``tailwind``
+    # does NOT match ``tailwindcss``. Case-insensitive.
+    missing = [
+        item
+        for item in required
+        if not re.search(rf"\b{re.escape(item)}\b", stack_body, re.IGNORECASE)
+    ]
     if missing:
         return PhaseResult(
             PhaseStatus.NOT_DONE,
diff --git a/.opencode/templates/backend/hooks/post_gen_project.py b/.opencode/templates/backend/hooks/post_gen_project.py
index 2422648..4706e84 100644
--- a/.opencode/templates/backend/hooks/post_gen_project.py
+++ b/.opencode/templates/backend/hooks/post_gen_project.py
@@ -54,6 +54,13 @@ def main() -> None:
             _remove(f"src/{pkg}/api/v1/routes/auth.py")
             _remove(f"src/{pkg}/services/auth_service.py")
             _remove(f"tests/test_auth.py")
+        # Write ``no_db = true`` into the existing ``[tool.project-status]``
+        # section so the project-status oracle skips the ``db/models``
+        # structure check for this no-db project (issue #266: no_db polarity
+        # fix). Append the key to the section at the end of the file.
+        pyproject = PROJECT_DIR / "pyproject.toml"
+        with open(pyproject, "a") as f:
+            f.write("\nno_db = true\n")
 
 
 if __name__ == "__main__":
diff --git a/.opencode/templates/fullstack/hooks/post_gen_project.py b/.opencode/templates/fullstack/hooks/post_gen_project.py
index b0a0d87..c25b5b5 100644
--- a/.opencode/templates/fullstack/hooks/post_gen_project.py
+++ b/.opencode/templates/fullstack/hooks/post_gen_project.py
@@ -50,6 +50,13 @@ def main() -> None:
             _remove(f"backend/src/{pkg}/api/v1/routes/auth.py")
             _remove(f"backend/src/{pkg}/services/auth_service.py")
             _remove(f"backend/tests/test_auth.py")
+        # Write ``no_db = true`` into the existing ``[tool.project-status]``
+        # section so the project-status oracle skips the ``db/models``
+        # structure check for this no-db project (issue #266: no_db polarity
+        # fix). Append the key to the section at the end of the file.
+        pyproject = PROJECT_DIR / "backend" / "pyproject.toml"
+        with open(pyproject, "a") as f:
+            f.write("\nno_db = true\n")
 
 
 if __name__ == "__main__":
diff --git a/tests/test_cookiecutter_templates.py b/tests/test_cookiecutter_templates.py
index d8d20e5..73d2027 100644
--- a/tests/test_cookiecutter_templates.py
+++ b/tests/test_cookiecutter_templates.py
@@ -984,6 +984,42 @@ def test_cookiecutter_json_default_is_valid_identifier(template_name):
     )
 
 
+# ── issue #266: cookiecutter use_db=no writes no_db marker ─────────────────
+
+
+@pytest.mark.parametrize(
+    "template_name, extra_context",
+    [("backend", {"project_name": "be", "use_db": "no", "use_auth": "no"})],
+)
+def test_backend_use_db_no_has_no_db_in_pyproject(render):
+    """Backend rendered with ``use_db=no`` contains ``no_db = true`` in
+    ``[tool.project-status]`` section of ``pyproject.toml`` (issue #266).
+
+    The post-gen hook appends ``no_db = true`` to the existing
+    ``[tool.project-status]`` section so the project-status oracle skips
+    the ``db/models`` structure check.
+    """
+    pyproject = (render / "pyproject.toml").read_text()
+    assert "[tool.project-status]" in pyproject
+    assert "no_db = true" in pyproject, (
+        f"expected 'no_db = true' in [tool.project-status], got:\n{pyproject}"
+    )
+
+
+@pytest.mark.parametrize(
+    "template_name, extra_context",
+    [("fullstack", {"project_name": "fs", "use_db": "no", "use_auth": "no"})],
+)
+def test_fullstack_use_db_no_has_no_db_in_pyproject(render):
+    """Fullstack rendered with ``use_db=no`` contains ``no_db = true`` in
+    ``[tool.project-status]`` section of ``backend/pyproject.toml``."""
+    pyproject = (render / "backend" / "pyproject.toml").read_text()
+    assert "[tool.project-status]" in pyproject
+    assert "no_db = true" in pyproject, (
+        f"expected 'no_db = true' in [tool.project-status], got:\n{pyproject}"
+    )
+
+
 @pytest.mark.parametrize(
     "template_name, extra_context",
     [
diff --git a/tests/test_project_contract.py b/tests/test_project_contract.py
new file mode 100644
index 0000000..c920932
--- /dev/null
+++ b/tests/test_project_contract.py
@@ -0,0 +1,140 @@
+"""Tests for ``.opencode/scripts/project_contract.py`` — single source of
+truth for project types, stacks, structure, frontend markers, no_db.
+
+The contract module is imported via ``importlib.util`` (no ``sys.path``
+mutation), mirroring how ``spec-status.py`` and ``project-status.py`` load it.
+"""
+
+from __future__ import annotations
+
+import importlib.util
+import sys
+from pathlib import Path
+
+SCRIPT_PATH = (
+    Path(__file__).resolve().parent.parent / ".opencode" / "scripts" / "project_contract.py"
+)
+_spec = importlib.util.spec_from_file_location("project_contract", SCRIPT_PATH)
+pc = importlib.util.module_from_spec(_spec)  # type: ignore[arg-type]
+_spec.loader.exec_module(pc)  # type: ignore[union-attr]
+
+
+# ── ProjectType enum ────────────────────────────────────────────────────────
+
+
+def test_project_type_enum_values():
+    """ProjectType has exactly 7 members including MCP_SERVER and UNKNOWN."""
+    members = {t.name for t in pc.ProjectType}
+    assert members == {
+        "FULLSTACK",
+        "BACKEND",
+        "CLI",
+        "BOT",
+        "WORKER",
+        "MCP_SERVER",
+        "UNKNOWN",
+    }, f"unexpected members: {members}"
+    # Values are lowercase strings.
+    values = {t.value for t in pc.ProjectType}
+    assert values == {
+        "fullstack",
+        "backend",
+        "cli",
+        "bot",
+        "worker",
+        "mcp-server",
+        "unknown",
+    }
+
+
+def test_valid_types_excludes_unknown():
+    """VALID_TYPES excludes ``"unknown"`` (used by spec-status PROJECT_TYPE)."""
+    assert "unknown" not in pc.VALID_TYPES
+    assert "mcp-server" in pc.VALID_TYPES
+    assert {
+        "fullstack",
+        "backend",
+        "cli",
+        "bot",
+        "worker",
+        "mcp-server",
+    } == pc.VALID_TYPES
+
+
+def test_stack_required_keys_match_valid_types():
+    """STACK_REQUIRED keys == VALID_TYPES (all 6 types including mcp-server)."""
+    assert set(pc.STACK_REQUIRED.keys()) == pc.VALID_TYPES
+
+
+def test_stack_required_uv_in_all_types():
+    """``uv`` stays in ALL stacks (build-tool, mentioned in stack.md)."""
+    for ptype, required in pc.STACK_REQUIRED.items():
+        assert "uv" in required, f"missing 'uv' in {ptype} stack: {required}"
+
+
+def test_structure_expected_keys_subset():
+    """STRUCTURE_EXPECTED keys ⊆ VALID_TYPES ∪ {"unknown"}.
+
+    BACKEND is resolved dynamically (not in dict); mcp-server TBD out of scope.
+    """
+    keys = set(pc.STRUCTURE_EXPECTED.keys())
+    valid_plus_unknown = pc.VALID_TYPES | {"unknown"}
+    assert keys.issubset(valid_plus_unknown), f"unexpected keys: {keys - valid_plus_unknown}"
+    # Backend NOT in dict (resolved dynamically via _expected_backend_paths)
+    assert "backend" not in keys
+    # mcp-server NOT in dict (out of scope)
+    assert "mcp-server" not in keys
+
+
+def test_no_db_supported_subset():
+    """NO_DB_SUPPORTED ⊆ VALID_TYPES (backend + fullstack only)."""
+    assert pc.NO_DB_SUPPORTED.issubset(pc.VALID_TYPES)
+    assert {"backend", "fullstack"} == pc.NO_DB_SUPPORTED
+
+
+def test_frontend_stack_markers_keys():
+    """FRONTEND_STACK_MARKERS has the expected keys with correct marker lists."""
+    assert set(pc.FRONTEND_STACK_MARKERS.keys()) == {
+        "fullstack_package_deps",
+        "fullstack_files",
+    }
+    assert pc.FRONTEND_STACK_MARKERS["fullstack_package_deps"] == [
+        "tailwindcss",
+        "bits-ui",
+    ]
+    assert pc.FRONTEND_STACK_MARKERS["fullstack_files"] == [
+        "frontend/components.json",
+        "frontend/tsconfig.json",
+    ]
+
+
+# ── re-export sanity (backward compat) ─────────────────────────────────────
+
+
+def test_spec_status_reexports_match_contract():
+    """``spec-status.py`` re-exports VALID_TYPES / STACK_REQUIRED from contract."""
+    spec_status_path = (
+        Path(__file__).resolve().parent.parent / ".opencode" / "scripts" / "spec-status.py"
+    )
+    ss_spec = importlib.util.spec_from_file_location("spec_status", spec_status_path)
+    ss = importlib.util.module_from_spec(ss_spec)  # type: ignore[arg-type]
+    sys.modules["spec_status"] = ss
+    ss_spec.loader.exec_module(ss)  # type: ignore[union-attr]
+    assert ss.VALID_TYPES is pc.VALID_TYPES or ss.VALID_TYPES == pc.VALID_TYPES
+    assert ss.STACK_REQUIRED == pc.STACK_REQUIRED
+
+
+def test_project_status_reexports_match_contract():
+    """``project-status.py`` re-exports ProjectType / STRUCTURE_EXPECTED."""
+    project_status_path = (
+        Path(__file__).resolve().parent.parent / ".opencode" / "scripts" / "project-status.py"
+    )
+    ps_spec = importlib.util.spec_from_file_location("project_status", project_status_path)
+    ps = importlib.util.module_from_spec(ps_spec)  # type: ignore[arg-type]
+    sys.modules["project_status"] = ps
+    ps_spec.loader.exec_module(ps)  # type: ignore[union-attr]
+    # Note: ProjectType is loaded twice (once here, once inside project-status
+    # via importlib.util with a different module name) so identity differs,
+    # but the enum members compare equal by value.
+    assert list(ps.ProjectType) == list(pc.ProjectType)
+    assert ps.STRUCTURE_EXPECTED == pc.STRUCTURE_EXPECTED
diff --git a/tests/test_project_status.py b/tests/test_project_status.py
index 2f91afe..bab9462 100644
--- a/tests/test_project_status.py
+++ b/tests/test_project_status.py
@@ -10,6 +10,7 @@ Covers: auto-detect (5 types + unknown), 7 check groups, format output
 """
 
 import importlib.util
+import shutil
 import sys
 from pathlib import Path
 
@@ -236,7 +237,15 @@ def _make_fullstack_repo(tmp_path: Path) -> None:
         "@router.get('/users')\nasync def list_users():\n    return []\n"
     )
     _write_pyproject(tmp_path / "backend", deps=["fastapi", "uvicorn"], cov_source=["src"])
-    (tmp_path / "frontend" / "package.json").write_text('{"name": "test-frontend"}\n')
+    # Fullstack cookiecutter template includes Tailwind v4 + shadcn-svelte + TS
+    # (issue #266): package.json deps + components.json + tsconfig.json are the
+    # 4 frontend stack markers checked by ``_check_frontend_stack``.
+    (tmp_path / "frontend" / "package.json").write_text(
+        '{"name": "test-frontend", "dependencies": {"tailwindcss": "^4.0.0", '
+        '"bits-ui": "^1.0.0"}}\n'
+    )
+    (tmp_path / "frontend" / "tsconfig.json").write_text('{"compilerOptions": {}}\n')
+    (tmp_path / "frontend" / "components.json").write_text("{}\n")
 
 
 # ── parse_remote_url ─────────────────────────────────────────────────────────
@@ -290,6 +299,19 @@ def test_load_config_defaults_when_no_pyproject(tmp_path):
     cfg = ps.load_config()
     assert cfg["route_line_limit"] == 50
     assert cfg["min_test_count"] == 1
+    assert cfg["no_db"] is False
+
+
+def test_load_config_reads_no_db(tmp_path):
+    """``[tool.project-status] no_db = true`` is parsed into config (issue #266)."""
+    monkeypatch = pytest.MonkeyPatch()
+    monkeypatch.setattr(ps, "REPO_ROOT", tmp_path)
+    (tmp_path / "pyproject.toml").write_text(
+        "[tool.project-status]\nroute_line_limit = 80\nno_db = true\n"
+    )
+    cfg = ps.load_config()
+    assert cfg["no_db"] is True
+    assert cfg["route_line_limit"] == 80
 
 
 def test_load_config_reads_section(tmp_path):
@@ -2142,3 +2164,102 @@ def test_scattered_models_no_pyproject_skip(tmp_path, ctx):
     )
     results = ps._check_scattered_models(ctx, ps.ProjectType.BACKEND)
     assert results == [], f"no pyproject should skip, got: {results}"
+
+
+# ── issue #266: frontend stack detection (fullstack) ────────────────────────
+
+
+def test_fullstack_frontend_stack_ok(tmp_path, ctx):
+    """All 4 frontend markers present (tailwindcss + bits-ui + components.json
+    + tsconfig.json) → OK."""
+    _make_fullstack_repo(tmp_path)
+    group = ps.check_structure(ps.ProjectType.FULLSTACK, ctx)
+    frontend_checks = [c for c in group.checks if c.name == "frontend stack"]
+    assert frontend_checks, f"expected 'frontend stack' check, got: {group.checks}"
+    assert frontend_checks[0].status == ps.CheckStatus.OK, (
+        f"expected OK, got {frontend_checks[0].status}: {frontend_checks[0].detail}"
+    )
+
+
+def test_fullstack_frontend_stack_missing_tailwind(tmp_path, ctx):
+    """package.json without ``tailwindcss`` dep → WARN."""
+    _make_fullstack_repo(tmp_path)
+    pkg = tmp_path / "frontend" / "package.json"
+    pkg.write_text('{"name": "test-frontend", "dependencies": {"bits-ui": "^1.0.0"}}\n')
+    group = ps.check_structure(ps.ProjectType.FULLSTACK, ctx)
+    frontend = [c for c in group.checks if c.name == "frontend stack"]
+    assert frontend and frontend[0].status == ps.CheckStatus.WARN
+    assert "tailwindcss" in frontend[0].detail
+
+
+def test_fullstack_frontend_stack_missing_shadcn(tmp_path, ctx):
+    """package.json without ``bits-ui`` dep (shadcn-svelte proxy) → WARN."""
+    _make_fullstack_repo(tmp_path)
+    pkg = tmp_path / "frontend" / "package.json"
+    pkg.write_text('{"name": "test-frontend", "dependencies": {"tailwindcss": "^4.0.0"}}\n')
+    group = ps.check_structure(ps.ProjectType.FULLSTACK, ctx)
+    frontend = [c for c in group.checks if c.name == "frontend stack"]
+    assert frontend and frontend[0].status == ps.CheckStatus.WARN
+    assert "bits-ui" in frontend[0].detail
+
+
+def test_fullstack_frontend_stack_missing_components_json(tmp_path, ctx):
+    """Missing ``frontend/components.json`` → WARN."""
+    _make_fullstack_repo(tmp_path)
+    (tmp_path / "frontend" / "components.json").unlink()
+    group = ps.check_structure(ps.ProjectType.FULLSTACK, ctx)
+    frontend = [c for c in group.checks if c.name == "frontend stack"]
+    assert frontend and frontend[0].status == ps.CheckStatus.WARN
+    assert "components.json" in frontend[0].detail
+
+
+def test_fullstack_frontend_stack_missing_tsconfig(tmp_path, ctx):
+    """Missing ``frontend/tsconfig.json`` → WARN."""
+    _make_fullstack_repo(tmp_path)
+    (tmp_path / "frontend" / "tsconfig.json").unlink()
+    group = ps.check_structure(ps.ProjectType.FULLSTACK, ctx)
+    frontend = [c for c in group.checks if c.name == "frontend stack"]
+    assert frontend and frontend[0].status == ps.CheckStatus.WARN
+    assert "tsconfig.json" in frontend[0].detail
+
+
+# ── issue #266: no_db polarity fix (backend) ────────────────────────────────
+
+
+def test_backend_no_db_skips_db_models(tmp_path, ctx):
+    """Backend with ``[tool.project-status] no_db = true`` in pyproject.toml
+    → ``db/models`` is NOT in the expected paths (no FAIL when absent)."""
+    _make_backend_repo(tmp_path)
+    # Remove the db/models dir (simulating cookiecutter use_db=no)
+    shutil.rmtree(tmp_path / "src" / "test_repo" / "db")
+    # Write a [tool.project-status] section with no_db=true into pyproject.toml
+    # (cookiecutter post_gen_project.py appends this to the existing section).
+    pyproject = tmp_path / "pyproject.toml"
+    pyproject.write_text(pyproject.read_text() + "\n[tool.project-status]\nno_db = true\n")
+    # Reload config so no_db is picked up
+    ctx_fresh = ps.RepoCtx(root=tmp_path, config=ps.load_config(tmp_path))
+    assert ctx_fresh.config["no_db"] is True, f"no_db not parsed: {ctx_fresh.config}"
+    group = ps.check_structure(ps.ProjectType.BACKEND, ctx_fresh)
+    # db/models should NOT be among expected checks (skipped by no_db)
+    db_models_checks = [c for c in group.checks if "db/models" in c.name]
+    assert not db_models_checks, (
+        f"db/models should be skipped with no_db=true, got: {db_models_checks}"
+    )
+    # And overall should not FAIL on db/models
+    assert group.overall() != ps.CheckStatus.FAIL or not any(
+        "db/models" in c.name and c.status == ps.CheckStatus.FAIL for c in group.checks
+    ), f"db/models FAIL despite no_db=true: {group.checks}"
+
+
+def test_backend_with_db_requires_db_models(tmp_path, ctx):
+    """Backend WITHOUT no_db marker → ``db/models`` required (FAIL if absent)."""
+    _make_backend_repo(tmp_path)
+    # Remove the db/models dir
+    shutil.rmtree(tmp_path / "src" / "test_repo" / "db")
+    # No no_db marker in pyproject — default config has no_db=False
+    assert ctx.config.get("no_db", False) is False
+    group = ps.check_structure(ps.ProjectType.BACKEND, ctx)
+    db_models_fail = [
+        c for c in group.checks if "db/models" in c.name and c.status == ps.CheckStatus.FAIL
+    ]
+    assert db_models_fail, f"expected db/models FAIL without no_db marker, got: {group.checks}"
diff --git a/tests/test_spec_status.py b/tests/test_spec_status.py
index 3754cfc..10d4f9b 100644
--- a/tests/test_spec_status.py
+++ b/tests/test_spec_status.py
@@ -521,6 +521,26 @@ def test_check_stack_case_insensitive(monkeypatch, tmp_path):
     assert result.status == ss.PhaseStatus.DONE
 
 
+def test_check_stack_word_boundary_uv_not_in_uvicorn(monkeypatch, tmp_path):
+    """Word-boundary regex: ``uv`` does NOT match ``uvicorn`` (issue #266).
+
+    stack.md contains ``uvicorn`` but no standalone ``uv`` → NOT_DONE with
+    ``uv`` in the missing list. Previously the substring match (``"uv" in
+    "uvicorn"``) gave a false positive.
+    """
+    spec_dir = _set_spec_dir(monkeypatch, tmp_path)
+    _write_meta(spec_dir, project="foo", type="backend")
+    # ``uvicorn`` contains the substring ``uv`` but \buv\b does not match it.
+    (spec_dir / "stack.md").write_text(
+        "- fastapi\n- tortoise\n- uvicorn\n- pytest\n- ruff\n- mypy\n- loguru\n- pydantic\n"
+    )
+    result = ss.check_stack()
+    assert result.status == ss.PhaseStatus.NOT_DONE, (
+        f"uvicorn should NOT satisfy 'uv' (word-boundary), got: {result.detail}"
+    )
+    assert "uv" in result.detail
+
+
 # ── check_modules (Phase 3) ──────────────────────────────────────────────────