fix(birss-tables): correct 5 Table 4f transcription errors (print-verified 2026-07-09)

[manganite]

Print-verification corrections to Table 4f (rank-4 tensor components) against the printed book pages 62–66 (maintainer-provided scans). All 21 rows × 25 columns are confirmed except five transcription-error sites, all in the Part II c4 column block — y/z resp. x/z glyph misreadings plus two impossible column headers.

Corrections (identical in table-4f.md and birss-tables.tex)

Site	Rows	Columns	Before → After
Header	—	c4 block cols 2–3	yxzz(c4)→xyxz(c4), yxxx(c4)→yxxz(c4)
Self-cells	A4, C4	same two	yxzz→xyxz, yxxx→yxxz
Value	K4, M4, O4, R4	xxyz/xyxz/yxxz	-yyyy→-yyyz
Value	K4, L4, O4	yyxz/yxyz/xyyz	-xxxx→-xxxz

The six c4 columns are the six arrangements of {x,x,y,z}: xxyz, xyxz, yxxz, yyxz, yxyz, xyyz.

Scope / safety

• Part I is unchanged. In particular the -xxxx cells in rows G4/J4 (the yyyy column) are correct as printed and are preserved — only the Part II c4 block was touched.
• Post-edit checks: yxzz, yxxx(c4), -yyyy no longer occur; xyxz(c4)/yxxz(c4) occur once each (header); -yyyz×4 and -xxxz×3 at the corrected rows; .md and .tex agree.
• Added a "Print-verified 2026-07-09" header line and a dated changelog entry to table-4f.md.
• Data-only reference correction; table-4f is not parsed by any guard test, so the suite is unchanged (lint clean, npm run test 1731 pass, build green).

Follow-ups (out of this PR)

• Canonical repo github.com/manganite/birss-tables: the app carries a vendored subtree copy; the identical corrections must also land canonically so table-4f.md ends up byte-identical in both. Direction (fix canonical + subtree-sync vs. apply in both) is the maintainer's call.
• PDF rebuild from the corrected .tex: maintainer's call.
• This unblocks the Phase-1 rank-4 guard tests (Tables engine, Part D blocker). The seven rank-3 VERIFY sign-offs remain a separate open loop.

⚠️ One note on the work order

Its sanity-check line said -xxxx "must no longer occur anywhere in the file," but rows G4/J4 legitimately carry -xxxx in Part I (confirmed-unchanged). That self-check is over-broad; the corrective action itself is unambiguous (item 5 lists only K4/L4/O4, and "all of Part I unchanged"), so I scoped the check to the c4 block and preserved G4/J4.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Data-only correction PR that updates the vendored Birss Table 4f (rank-4 tensor components) transcription to match print-verified sources, keeping the Markdown (table-4f.md) and LaTeX (birss-tables.tex) versions consistent.

Changes:

• Corrects the Part II c4 block column headers and the corresponding self-cells in rows A4/C4 (yxzz/yxxx → xyxz/yxxz).
• Fixes affected Part II c4 block values in rows K4/L4/M4/O4/R4 (-yyyy → -yyyz, -xxxx → -xxxz in the specified columns).
• Adds a print-verification note and a dated changelog entry documenting the five corrected transcription sites.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
birss-tables/table-4f.md	Updates the Part II c4 headers and specific cells/values; adds a print-verification note and changelog entry documenting the corrections.
birss-tables/birss-tables.tex	Mirrors the same Part II c4 header/cell/value corrections in the LaTeX source to keep the published tables consistent.

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