[nikiwang-125]

Summary

Fixes #120.

An asset that a generation config pins directly (binding=pinned, no canvas node) disappeared from the asset list ("all" and "hidden") and became available=false in reference-catalog once another asset listed it in provenance.sources, for example after a generation result was registered. The file and the live reference were still there.

Cause: CreationHistory._inventory puts every provenance.sources asset into historical, while current only counted canvas items, current results, and subject documents. It did not count live pinned references. Both asset_list and reference_catalog hide historical - current.

Fix: _inventory now adds the assets of active pinned references to current.

• Listing: with no canvas owner, the asset shows under "hidden" (未显示).
• Removing the reference: the asset goes back to being filtered as a historical source, as before.
• Deletion protection: unchanged. _usage_many already treats live references, provenance, and history as dependencies.

Test plan

New test test_asset_used_only_by_an_active_pinned_reference_stays_listed_after_becoming_a_source:

• pins an asset with no canvas node, then makes it another asset's provenance.sources;
• checks it is still in "all" and "hidden", catalog available and fileAvailable are true, the result survives a fresh store (reopen), and usage still reports it as used;
• after reference.remove, checks it is filtered as before and still protected from deletion.

Results:

• The new test fails on main and passes with the fix.
• tests/test_creation_history_service.py: 17 passed.
• History, reference editor, API, node versions, workflow, canvas service, and assets test files: 113 passed, 1 failed (Windows).
• The 1 failure is test_symlinked_content_and_asset_paths_are_rejected_without_external_writes. It fails identically on unmodified main on Windows (symlink permissions).

Not covered: this was run on Windows only, not Linux, and there is no browser end-to-end check. The new test makes the asset a source through asset.writeText with previousAsset, which writes the same provenance.sources as a registered result, instead of going through artifact.publish, which does not run on Windows.

Note for review: a canvas-derived pinned reference (with sourceVersion) that still pins an older node version will now also be listed as hidden, because it is a live reference too. Pure historical versions that nothing references are still filtered.

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