Consolidate approved policies and add local lease, document CAS, commit, candidate and environment gates. Preserve conservative recovery and cleanup limits.
*.md was excluding templates/docs from Docker context, so COPY and
go:embed could not see prelim_design.md at /app. Un-ignore those trees
and assert the smoke image can cat the official file.
Co-authored-by: Cursor <cursoragent@cursor.com>
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