chore(upstream): track the compaction message queue fix

[incognitojam]

Problem

Messages sent during context compaction can be rejected as steering instead of queued. Upstream #12824 addresses this regression and is still open.

Change

Add an ordinary watch entry explaining the regression and why we are waiting for upstream merge and chronological intake. The lag and intake reports keep the fix visible without changing queue order.

Scope and approval

Maintainer-requested update to the existing upstream watch list, limited to .github/upstream-tracked-prs.json.

Verification

• vp test run scripts/upstream/lib/tracked-prs.test.ts: all six tests pass, covering watch-entry validation and report/status behavior.
• The updated JSON passes decodeTrackedPRs and vp fmt --check.
• node scripts/upstream/tracked-prs-report.ts --fork-ref HEAD shows fix(v2): queue messages sent while context compaction runs pingdotgg/t3code#12824 as open, with the expected watch reason and no provisional snapshot.

---

Written by an agent (Codex, gpt-6.1-sol).

[github-actions]

Upstream divergence

Both sides are compared with upstream at the in-order tip 263097a8da. Excludes .repos/ and pnpm-lock.yaml.

Measure	Base	This PR	Change
Upstream files the fork changes	1,327	1,327	0
Lines changed in them	59,638	59,638	0
Upstream files the fork removes	37	37	0
Fork-only files	410	410	0
Fork-only lines	71,567	71,571	+4

No upstream file changes how much it differs from upstream.

[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	4.9 KiB	4.9 KiB	−40 B (−0.8%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.7 KiB	3.7 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.1 KiB	−40 B (−3.3%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	20.4 KiB	20.4 KiB	−41 B (−0.2%)	29.3 KiB	✅
Codex	Live turn messages	2	1	−1 (−50.0%)	8	✅
Claude	Total thread wire	4.9 KiB	4.9 KiB	+41 B (+0.8%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.7 KiB	3.7 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	+41 B (+3.5%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	20.7 KiB	20.8 KiB	+41 B (+0.2%)	29.3 KiB	✅
Claude	Live turn messages	1	2	+1 (+100.0%)	8	✅

Baseline: 8d2ebd6 · PR result: 9033105 · 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: 106.1 KiB
• Claude decoded thread snapshot: 106.4 KiB

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