docs(repo): add scope map

[stacknil]

Summary

• add docs/repo-scope-map.md as a short flagship/supporting/non-claim boundary map
• link the scope map from the root README and reviewer brief
• include the scope map in the reviewer route validation contract

Validation

• python scripts\validate-reviewer-routes.py
• python -m py_compile scripts\validate-reviewer-routes.py
• git diff --cached --check
• git ls-files --eol -- README.md docs/reviewer-brief.md docs/repo-scope-map.md scripts/validate-reviewer-routes.py

Privacy

• changed-file diff scanned for sensitive path, identity, and secret patterns

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