Adds a version-evolution capability to the Artifacts pane:
- Evolution chain: LCS-based diff across successive versions of the
same logical artifact; when a blob is missing, the chain honestly
surfaces a placeholder rather than fabricating diff content.
- Board / Timeline tab switcher on the Artifacts page.
- Auto-grouping into 5 kinds so the Board reads at a glance.
Files:
src/renderer/artifacts-board.js — new Board / Timeline / Evolution views
src/renderer/artifacts.js — wire Board tab + evolution rail
src/renderer/index.html — script tag + tab markup
src/renderer/style.css — tail append (~200 lines)
test/artifact-evolution-board.test.js — 23 new tests
docs/artifact-board-fixture.json — fixture seed
docs/qa-artifact-evolution/ — 3 QA screenshots + fixture.html
scripts/qa-cdp-shoot-artifact-v2.mjs — QA capture harness
Merged as source-repo test-real @ 7279870 (with lane-side conflict
resolution against test-real @ c1d93aa: style.css tail-append union;
independent of Lanes C/A/D CSS sections).
Test suite: 1727/1727 pass (+23 over Lane C+A+D baseline of 1704).
Follow-up L-3 (in upstream ledger): runtime ArtifactServer to grow
a snapshot store so the "missing blob" fallback becomes rare.
ZiyaZhang
c8f5ca3d5b