Harden peer file artifact lifecycle - #77
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What changed
Why
The core peer file retrieval implementation is already present on main via PR #62, but lifecycle edge cases and the document status were not aligned.
Impact
Artifact references continue to fail closed after expiry or source-file removal. Host-to-peer ephemeral artifact grants remain explicitly out of scope for this PR.
Validation
uv run --no-sync pytest tests/nodes/test_peer_file_registry.py tests/nodes/test_peer_file_retrieval.py tests/nodes/test_auth_boundary.py(20 passed)