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* fix(artifacts): serve SHA-256 via ETag so preview/edit work on non-secure contexts crypto.subtle is only available in secure contexts (HTTPS or localhost). The frontend fell back to it to compute an artifact's SHA-256 when the Gateway did not return one, which threw on http://<lan-ip>:<port> and broke both artifact preview and inline editing (issue #4864). - Gateway now returns the real SHA-256 as an ETag header for inline text and active-content artifact responses (and skill-archive members). - Frontend prefers the ETag and only computes a hash as a last resort, falling back gracefully (FNV-1a) instead of throwing when crypto.subtle is missing. * fix(artifacts): address PR review feedback for #4864 - Cache SHA-256 digests by (path, mtime_ns, size) so the many small Range requests a browser issues while scrubbing/paginating a preview do not each re-hash a potentially huge artifact from scratch (performance). - Gate inline editing on a real 64-hex revision: hasRevision requires sha256.length === 64, so the FNV-1a fallback on non-secure origins keeps preview working but no longer 422s on save (contract). - Anchor and lowercase the ETag regex and accept the weak W/ prefix gzip emits, so uppercase hex and longer digests (sha-384/512) can't masquerade as sha-256. - Cover the forced-download ETag on the backend and add frontend tests for weak-ETag parsing and the non-secure-context FNV fallback. Feedback from reviewer willem-bd on PR #4865. * style: fix ruff format and prettier issues - test_artifacts_router.py: collapse two over-split client.get() calls to satisfy ruff format (line-length 240) - loader.ts / artifact-file-detail.tsx / loader.test.ts: apply prettier formatting and restore LF line endings * style: fix ruff format and prettier issues - test_artifacts_router.py: collapse two over-split client.get() calls to satisfy ruff format (line-length 240) - loader.ts / artifact-file-detail.tsx / loader.test.ts: apply prettier formatting and restore LF line endings * style: fix ruff format and prettier issues - test_artifacts_router.py: collapse two over-split client.get() calls to satisfy ruff format (line-length 240) - loader.ts / artifact-file-detail.tsx / loader.test.ts: apply prettier formatting and restore LF line endings * style: fix ruff format and prettier issues - test_artifacts_router.py: collapse two over-split client.get() calls to satisfy ruff format (line-length 240) - loader.ts / artifact-file-detail.tsx / loader.test.ts: apply prettier formatting and restore LF line endings * style: reformat artifact-file-detail.tsx for prettier with tailwind class ordering * fix: invalidate SHA-256 cache after artifact edit Clear the LRU cache after os.replace() so the next preview request computes the new digest. Edits are rare, so clearing the whole 256-entry cache costs nothing (addressing PR review comment #5). * fix(artifacts): skip ETag for oversized files + CRLF->LF + cache invalidation (#4865) * fix(loader): use real empty-content SHA-256 for empty 416 range (#4865) * test(artifacts): assert oversized artifacts carry no SHA-256 ETag (#4865) * style(frontend): format long sha256 constant (prettier) * test(backend): fix oversized-artifact ETag assertions and formatting (ruff) * test(backend): keep oversized-payload line within ruff 240-col config