docs(upstream): close the v1.6.1 sync and advance tracked parity

[sunerpy]

Summary

Closes the colby v1.6.1 sync now that every ported row has shipped in codegraph-rs v0.51.0 and the downloaded release has been verified.

• docs/upstream-sync/UPSTREAM.md
  • Current alignment: tracked colby release v1.6.0 → v1.6.1. The last discovery audit is the v1.6.1 tag f4ddf50; the previous boundary is the 2026-09-15 main audit 3ed73bc; the next discovery starts at f4ddf508516332419ea3c95702810765936cf679..origin/main. The UI-epic bullet now records the owner's 2026-10-01 deferral of the viewer and F1–F12.
  • New 1.6.0 → 1.6.1 sync: COMPLETE callout with its exceptions: the UI family; #770; the #1829/#1878 fast path; the KEEP-RUST divergences the audit records row by row.
  • New 2026-10-01 CLOSEOUT sync-log entry:
    • the seven PRs with their merge SHAs, and the extraction-version move from 12 to 17;
    • which goldens and MCP fixtures changed, and in which PR;
    • the two release-gate fixes, test: keep two Windows-only flakes off the release gate #283 and ci: leave release-please's scaffold.json bump out of oxfmt #284;
    • the release PR, the release run and the main CI run IDs, and the Linux musl digest;
    • the black-box acceptance of the downloaded binaries.
• docs/upstream-sync/V1_6_1_AUDIT_2026-09-30.md: the header's tracked-release line no longer says parity waits for the release.
• scripts/docs-check.py: pins the new next-discovery boundary and tracked release, so the ledger can't drift back.

Every fact in the entry was checked against git log v0.50.3..4ce8813, the golden diffs per PR, gh run view and gh release view, and the recorded output of the verification runs.

Verification

• make tools-check fmt-check docs-check: passed, with oxfmt clean and docs-check: OK (34 markdown files).
• This is a docs-only change: no Rust, no fixtures, no workflows. It was pushed without the local pre-push suite, and the PR's CI runs the full gate.
• docs commits are hidden in release-please's default changelog sections, so this merge does not propose a release.

🤖 Generated with Claude Code

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[chatgpt-codex-connector]

Preserve the dated audit snapshot

Restore the audit-time statement that parity was still awaiting release verification. Replacing it with the next day's outcome retroactively rewrites a dated audit, losing the distinction between what was known on September 30 and the October 1 closeout; that outcome is already recorded in the newly appended ledger entry. The repository explicitly treats dated audits as append-only evidence and requires present-day facts to go in the mutable Current alignment block plus a new dated entry.

AGENTS.md reference: docs/AGENTS.md:L19-L21

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main     #285   +/-   ##
=======================================
  Coverage   95.29%   95.29%           
=======================================
  Files         158      158           
  Lines       97623    97623           
=======================================
+ Hits        93031    93032    +1     
+ Misses       4592     4591    -1     

see 1 file with indirect coverage changes

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