[lukemaj]

Why

scripts/fork-check.sh fails a PR once the fork stack exceeds MAX_COMMITS=20, a limit chosen arbitrarily in PR #9 with no supporting evidence. Main is already at 20 commits, so every fork PR fails this check now (e.g. PR #56). Rebase cost comes from upstream-file edits, which the same script already enforces through the allowlist and feature map, so the count adds nothing on top.

What

• scripts/fork-check.sh: remove the --max-commits option and the count-exceeds failure branch; keep the informational stack: N commit(s) line and the commit list.
• docs/fork.md: drop the "at most 20 commits" bullet from the fork-check description.
• No merge-commit check or allowlist check changed.
• No test asserted the removed cap (checked scripts/fork-maintenance.test.ts), so no test changes needed.

Proof

• bash scripts/fork-check.sh --base $(git merge-base HEAD origin/main) → fork-check: OK.
• vitest run scripts/fork-maintenance.test.ts → 12/12 passed.

🤖 Generated with Claude Code

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.5 KiB	13.5 KiB	+7 B (+0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	0 B (0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.5 KiB	6.5 KiB	+7 B (+0.1%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.3 KiB	56.3 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	10	10	0 (0.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.5 KiB	+17 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	−5 B (−0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.4 KiB	6.5 KiB	+22 B (+0.3%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.0 KiB	57.0 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: d11ac07 · PR result: dcf22be · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 113.9 KiB
• Claude decoded thread snapshot: 114.6 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.