* fix(config): rename CONTEX7_API_KEY to CONTEXT7_API_KEY
* fix(permissions): update stale config/scripts paths to .opencode/scripts
* test(config): add tests for typo fix and updated paths
* docs(handoff): add handoff and ADR-018 for hotfix
* docs(handoff): set PR number
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Co-authored-by: opencode-agent <agent@slaid098.dev>
