chore: use single header row for post merge spreadsheet

[jvbriones]

The post validation tracker excel template was updated to use a single header row.

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Note

Medium Risk
Updates the Google Sheets write/read ranges and row insert/delete indices, which can misalign headers vs appended PR data if the spreadsheet template differs from expectations. Changes are isolated to the post-merge tracking script and don’t affect production runtime code.

Overview
Aligns the post-merge validation tracker spreadsheet format to a single header row by writing all headers (including the platform label) into row 1 and shifting data to start on row 3.

Updates sheet creation from template/blank to insert/delete the correct spacer row, and adjusts readRows/appendRows ranges accordingly so deduping and new PR inserts operate on the new row layout.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve headers when creating a non-template sheet

In createSheetFromTemplateOrBlank, the fallback path (when no template tab exists) now only writes A1 and skips writing any column headers. This is a regression from the previous behavior, where A2:H2 was populated via headerRowFor(platformType). If template lookup fails (the exact case this branch handles), the generated tab has unlabeled validation columns, which makes the tracker hard to use and can lead to incorrect manual validation updates.

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