docs(evidence): retain clean-ladder rung evidence behind a verified post-run step (#1530)

[DecisionNerd]

Completed ladder reports must remain inspectable after loss of the host work directory. This change adds a documented retention command, verifies receipt and projection digests and consistent commit identities, and commits the surviving baseline receipts and seven controller summaries with manifests. It records historical evidence loss without claiming the missing receipts were recovered.

The archive regression verifies every retained manifest payload. Controller summaries retain their exact original bytes, including whitespace, so their recorded digests remain valid. The evidence work root stays protected from tests and cleanup tools.

Fixes #1530

Validation:

• PYTHONPATH=harness uv run --locked --with pytest python -m pytest -o addopts= -o 'python_classes=*Tests' tests/test_ladder_retention.py -q --tb=short (from benchmarks): 15 passed, 33 subtests passed.
• uv run ruff format --check benchmarks/ and uv run ruff check benchmarks/: passed.
• make gate-registry-check: valid registry, 14 tests passed.
• Read all manifest payloads from committed Git objects: 29 files present with matching digests.
• Independently verified review findings fixed: omitted ignored summaries, conflicting commit identities, missing/corrupt projection acceptance, and incorrect relative documentation destination.
• Required exact-head CI remains the merge gate.

[coderabbitai]

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