[sergo] Sergo Report: Clean-Slate Reconcile + New-Linter Day-One Audit - 2026-10-22

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Overview

Run §39719030477. Serena go/typescript/bash language servers ready (gopls healthy, checked first per the R102 hard-stop lesson). Reconcile found the entire R103 backlog landed, two long-running CI-asymmetry sagas genuinely closed, and 2 brand-new linters added same-day as R103 that had never been audited. Filed 1 new, well-evidenced issue.

Key metrics

• Serena tools: 24, stable, no drift.
• Linter registry: 82 -> 84 (PR Add formatintitoa and osisnotexist Go linters #70801, 2026-10-21): new 83rd/84th = formatintitoa, osisnotexist.
• Open sergo issues: 9 -> 0. All of R103 backlog landed (68944,68945,69223,69613,69834,70142 completed; 68590/68591 auto-expired not_planned as usual; sg103a1=contextcancelnotdeferred still enforced on native CI only - wasm LINTER_FLAGS omission unfixed (11th occurrence, lineage #55932) #70770 and sg103a2=sprintferrdot: isErrorDotCall bare CallExpr assertion escapes a parenthesized .Error() call (paren_unwrap_gap) #70771 both completed).
• New issues filed this run: 1.
• Strategy split: cached-reuse went into verifying two reverse-phantom-prone fixes directly against code rather than trusting labels; new-exploration went into day-one auditing the 2 new linters.

Findings

Confirmed fixed (not just labeled closed) - spot-checked directly against cgo.yml rather than trusting GitHub state:

• contextcancelnotdeferred native/wasm CI omission (11-cycle lineage since contextcancelnotdeferred is enforced on native CI but absent from wasm LINTER_FLAGS - the registry-drift guard cannot detect it #55932) - now present in both native (:1668) and wasm (:1695) LINTER_FLAGS. Saga closed.
• consolestderr native-only CI step (consolestderr (78th linter) CI-enforced on native only - omitted from the wasm custom-linters run (ci_target_asymmetry recurrenc #67609) - now has its own step in both native (:1671) and wasm (:1697). Saga closed.

New finding - osisnotexist (84th linter, day-one): idiom_reflag_no_allowlist. The linter flags every os.IsNotExist/IsExist/IsPermission/IsTimeout call with no exception for the ubiquitous, fully-safe same-statement os.Stat(...); os.IsNotExist(err) idiom. Sampled 114 live occurrences across 66 production files (excluding tests and the linter own testdata) - every sample checked is the safe, unwrapped, immediate-check shape, not the wrapped-error case the linter rationale targets. Not yet CI-enforced, so filed now to prevent a future 114-site forced rewrite. Filed as issue (see references).

Audited clean - formatintitoa (83rd linter, day-one). Correctly reuses the already-paren-safe astutil.PackageCall helper, does an exact go/types int64-vs-int identity check, and has zero live production occurrences (fully latent, no bug found).

Full evidence and sample call sites

osisnotexist safe-idiom samples (all unwrapped, same-statement):

• pkg/cli/run_workflow_execution.go:269
• pkg/parser/import_cache.go:86-87
• pkg/workqueue/branch_git.go:261,325
• pkg/cli/mcp_helpers.go:58-59
• pkg/linters/ssljson/ssljson.go:206-208

get_diagnostics_for_file via Serena confirmed osisnotexist.go itself compiles clean (no gopls diagnostics).

Generated task

1. Narrow osisnotexist with a same-statement allow-list before CI-enforcement, reserving the diagnostic for genuinely wrapped/reassigned errors (issue filed, see references).

Historical context

This closes out two patterns that had each reverse-phantomed for years: ci_target_asymmetry (11 cycles on contextcancelnotdeferred alone) now has zero known open instances. idiom_reflag_no_allowlist recurs for the 2nd time (after blankassigncomma/#64681) - worth a standing day-one check on every new linter going forward alongside the existing paren_unwrap_gap check.

Next-run focus

Watch for an 85th linter via the commits?path=pkg/linters/registry.go fast-detector; verify this run issue landed; re-tally open count (expect 0-1).

References:

• Run: §39719030477

Generated by 🤖 Sergo - Serena Go Expert · claude · agent · 196.8 AIC · ⌖ 0.588 AIC · ⊞ 5.3K · ◷

• expires on Oct 22, 2026, 8:03 PM UTC-08:00

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This discussion was automatically closed because it expired on 2026-10-23T04:03:21.827Z.

Closed by Workflow