Pin backend e7fb276 (PR #68): wide sparse columns (>=1024, XFD-styled cells) skip per-sheet instead of firing the cell-cap warning and dropping later worksheets; malformed sheet XML warns explicitly; builtin:legacy-office joins the parser registry. Evidence: SELF make test rows on .task/fix-ext-5-wide-cols.md (final-tree rerun); GATE = CI make test + make build on this head.
Pin backend e7fb276 (PR #68): wide sparse columns (>=1024, XFD-styled cells) skip per-sheet instead of firing the cell-cap warning and dropping later worksheets; malformed sheet XML warns explicitly; builtin:legacy-office joins the parser registry. Evidence: SELF make test rows on .task/fix-ext-5-wide-cols.md (final-tree rerun); GATE = CI make test + make build on this head.
Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/fix-ext-5-wide-cols.md; R0=c06da5735904e63db4cbcdb75b3b10b48aeffc32.
Impact: task metadata only; the feature workspace starts at c06da57359.
Refs: .task/fix-ext-5-wide-cols.md
Why: backend e7fb276 fixes the EXT-5 review findings; pin it and keep the verification row with it.
Evidence: SELF receipt exit=0 (full make test green); backend PR #68 CI pending as GATE.
Impact: modules/backend gitlink 727f370 -> e7fb276; task card row.
Refs: .task/fix-ext-5-wide-cols.md
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Pin backend e7fb276 (PR #68): wide sparse columns (>=1024, XFD-styled cells) skip per-sheet instead of firing the cell-cap warning and dropping later worksheets; malformed sheet XML warns explicitly; builtin:legacy-office joins the parser registry. Evidence: SELF make test rows on .task/fix-ext-5-wide-cols.md (final-tree rerun); GATE = CI make test + make build on this head.