docs: one Last updated line per parity doc after merging

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/file-format-parity.md

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 # File-format parity
 
-> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-19 · **Change:** minor (.xls dialog sheets are skipped instead of read as worksheets) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-19 · **Change:** minor (`.xls` import reads each sheet's display options from WINDOW2: right-to-left, gridlines, headings, zeros, formulas) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-19 · **Change:** trivial (XLSX text boxes and shapes keep their paragraphs' right-to-left direction on save; previously trivial: formulas over Excel's 8,192 characters, and `%` or call chains past the nesting limit, are parse errors instead of stack overflows when a file is opened) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-18 · **Change:** trivial (CSV/TSV/TXT can open with every field kept as text via `file.open {csvAsText}`; formulas over Excel's 8,192 characters, and `%` or call chains past the nesting limit, are parse errors instead of stack overflows when a file is opened; previously trivial: XLSX chart sheets are kept on save (#727)) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-18 · **Change:** trivial (XLSX PivotTables read and write `rowGrandTotals`/`colGrandTotals` the way Excel does, so a table saved with only one grand total opens with the right one; previously trivial: formulas over Excel's 8,192 characters, and `%` or call chains past the nesting limit, are parse errors instead of stack overflows when a file is opened) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
+> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-19 · **Change:** minor (.xls dialog sheets are skipped instead of read as worksheets; `.xls` import reads each sheet's display options from WINDOW2: right-to-left, gridlines, headings, zeros, formulas; XLSX text boxes and shapes keep their paragraphs' right-to-left direction on save; CSV/TSV/TXT can open with every field kept as text via `file.open {csvAsText}`; formulas over Excel's 8,192 characters, and `%` or call chains past the nesting limit, are parse errors instead of stack overflows when a file is opened; XLSX PivotTables read and write `rowGrandTotals`/`colGrandTotals` the way Excel does, so a table saved with only one grand total opens with the right one) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
 
 Every format Excel opens or saves, with GridCraft's read and write support, fidelity and tests.
 Part of [target-app-parity.md](target-app-parity.md). **File formats: ~50% ready, 80–120 h**

docs/localization-parity.md

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 # Localization parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-19 · **Change:** minor (defined-name length limit counts characters, so long Arabic names are accepted) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-19 · **Change:** minor (Table names are limited to 255 characters) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-19 · **Change:** minor (right-to-left sheets in `.xls` files open right-to-left) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-19 · **Change:** trivial (text boxes and shapes keep right-to-left paragraph direction through XLSX save; previously minor: Format Cells dialog looks its labels up in the catalog) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-19 · **Change:** minor (defined-name length limit counts characters, so long Arabic names are accepted; Table names are limited to 255 characters; right-to-left sheets in `.xls` files open right-to-left; text boxes and shapes keep right-to-left paragraph direction through XLSX save) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
 
 Per-language status against Excel, which ships its UI in dozens of languages (Windows language
 packs cover 100+), with localized function names, argument separators, number and date formats,

docs/ui-parity.md

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 # UI parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-19 · **Change:** minor (Ctrl+Enter fill gives each cell the automatic number format typing gives it) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-18 · **Change:** minor (keytip letters typed with Alt held, #1846) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-19 · **Change:** minor (Ctrl+Enter fill gives each cell the automatic number format typing gives it; keytip letters typed with Alt held, #1846) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
 
 Interaction, controls and feel, against Excel. Part of [target-app-parity.md](target-app-parity.md).
 **UI/UX fidelity: ~55% ready, 50–80 h** (estimated). Ribbon command coverage is measured