docs(impl): PR7 implementation note + STATUS update
Adds `pr7-ci-boundary-scan.md`:
- Scope summary (allowlist + AST scanner + TYPE_CHECKING exemption + self-tests + CLAUDE.md docs)
- Per-task commit table (T7.1-T7.5; T7.4 is the revert-after-prove injection drill — no commit by design)
- Acceptance: RED->GREEN cycle, 9 self-tests, T7.4 inject/revert, 3241 passed + 31 skipped + 18 caplog flake
- Architecture decisions (TYPE_CHECKING exemption vs allowlist inclusion, toml path-list shape, pytest-not-separate-CI-step, scope kept narrow, plan-draft vs ground-truth allowlist)
- File structure index (new vs modified)
Updates STATUS.md:
- One-line status moves to PR7 merged; Stage 0 now only PR8 left
- 8-PR status table: PR7 row marked merged with commit range and impl note link; commit count notes T7.4 has no commit by design
- Test baseline line: PR7 末 3241 + 31 + 18 (PR6 末 3214 + 30 + 17, +27/+1/+1 explained)
- Next-step suggestion switches to PR8 (parallel-eligible since PR4); PR7 inline-mode retro added
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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