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Reviewed commit: ccd6eec944

Major progress. All prior findings resolved: sync.Once replaced with mutex (last-writer-wins for retries), reference-counted step counter cleanup, ReasoningStart/ToolInput stream parts captured, unconsumed-stream safety net via context.AfterFunc, GenerateObject and normalizeToolResultOutput test coverage, ErrNilModelResult sentinel error, SDK parity tests. The #24137 tracking ticket items are done.

Severity breakdown: 0 P1-P2, 3 P3 (2 new inline, 1 convention scan in body).

All 4 reviewers converged on the same dead code at model.go:489 (and its sibling at 621). The second if condition is unreachable after the first already mutates streamStatus. One new P3 from Chopper on error-typed stream parts with nil Error producing StatusError with no diagnostic context.

Convention scan found 8 em-dash characters (U+2014) across model.go (lines 365, 463), model_coverage_test.go (lines 18, 305, 310, 325), and model_internal_test.go (lines 365, 750). These should be double-hyphens (--) per project convention.

Lower-priority notes not posted inline:

• model_internal_test.go:412 capturedHandle declared but never assigned; test name promises interrupted-status verification it doesn't deliver.
• model.go:997 redundant nil guard on *ToolResultContent inconsistent with other pointer arms (both already guarded by isNilInterfaceValue).
• stubs.go:61 trackRunRef/releaseRunRef has a theoretical TOCTOU between decrement and delete, exploitable only if two ContextWithRun calls with the same UUID overlap with a GC cycle.

Takumi: "The concurrency model is clean. I traced every interleaving. No new concurrency bugs found."

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F16 (dead code) and F17 (nil-error diagnostic) both addressed in ce601d4. The unreachable second if blocks are deleted, and synthetic error payloads are added for nil-Error stream parts.

F18 (em-dash characters in comments) and F19 (capturedHandle never assigned in test) are silent -- no author response or code change since R16. Both were posted in the review body, not as inline comments, which may have contributed to the silence.

Review is blocked until F18 and F19 are addressed, acknowledged, or responded to.

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Reviewed commit: ce601d47dc

All 19 prior findings resolved. F18 (em-dashes) and F19 (test capturedHandle) addressed in 9157a5c. Takumi confirms concurrency is clean for the second consecutive panel round.

Severity breakdown: 0 P0-P2, 2 P3, 5 Nit.

Two new P3s from the panel: Meruem found a concrete TOCTOU interleaving in the reference-counted step counter cleanup, and a tautological test assertion in StreamCompletedAfterFinish. Zoro flagged the rune-truncation duplication between boundText and TruncateLabel.

Netero's first pass caught 3 nits (tc:=tc Go 1.22 artifact, double-hyphen em-dash substitutes, maxInt vs builtin max) and Mafuuu caught 1 (test assertions using len() where production uses rune count).

Zoro: "Same-package duplication that shares an identical edge-case set is a maintenance sibling waiting to diverge."

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All 8 R18 findings addressed in 5ec36e0. The TOCTOU in releaseRunRef is fixed with CompareAndSwap+CompareAndDelete. The tautological test assertion is rewritten with direct handle verification. The rune-truncation duplication is extracted into truncateRunes. All nits (tc:=tc, maxInt, len() in tests, double-hyphen substitutes) cleaned up.

Severity breakdown: 0 P0-P3, 1 Nit.

4 panel reviewers, 0 findings. Takumi: concurrency clean for the 4th consecutive panel round. Razor (wildcard): independently verified all claims match behavior across all source and test files.

One remaining Netero nit (F28): 3 double-hyphen em-dash substitutes in prose comments at model.go:365, 466 and model_internal_test.go:709. The R18 fix caught model_coverage_test.go but missed these.

Takumi: "The CAS-based ref counting in releaseRunRef closes the TOCTOU from F24 to a negligible residual window. All shared state is properly guarded."

Razor: "After full diff review, test execution, and tracing the reference-counting, stream finalization, and normalization paths: no new defects. The code's claims match its behavior at every point I tested."

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Reviewed commit: f3a8793276

Status: APPROVED

F28 (last remaining double-hyphen nit) addressed in f3a8793. All 28 findings resolved across 20 rounds.

Netero first pass: clean across all 8 sections. Panel: 0 findings from all 4 reviewers (Mafuuu, Pariston, Meruem, Knov). Pariston independently tested three adversarial angles (lossy normalization, stream finalization holes, dual-package type drift) and found all three guarded.

The code is clean. The normalization wrapper correctly intercepts at the LLM call boundary, the concurrency model is sound (confirmed by Takumi across 4 consecutive panel rounds and Meruem across 3), the field coverage test catches drift from the fantasy library, and every prior finding has been addressed in code or tracked with a ticket.

Pariston: "I spent the review trying to build a case that this change solves the wrong problem, or solves the right problem at the wrong level. I could not."

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Reviewed commit: f03adedb86

Status: APPROVED

The mutex simplification in f03aded replaces the CAS-based ref counting with a straightforward refCountMu serializing both trackRunRef and releaseRunRef. All 4 panel reviewers + Netero confirm 0 findings. Mafuuu verified the serialization against 3 adversarial scenarios including rapid RunID reuse and double-registration. Pariston independently confirmed the mutex eliminates the TOCTOU window and the nextStepNumber invariant holds (live RunContext implies ref count >= 1, so no deletion races). Kite praised the simplification.

All 28 findings resolved. Two consecutive clean panel rounds (R20, R21) with 0 findings from 9 distinct reviewers across both rounds.

Pariston: "The problem is correctly understood, the solution is proportional to the problem, and the latest mutex simplification is at the right causal level. After 20 rounds and 28 resolved findings, the premises are solid."

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