feat(audit): add sin-code audit --complexity (repo-wide ponytail-audit analog)

[Delqhi]

Closes #180

Summary

Adds sin-code audit complexity as a repo-wide ponytail-audit analog and integrates it as the 48th gate in sin-code ceo-audit.

What changed

• cmd/sin-code/internal/audit/complexity.go — Auditor, Finding, Result types, deterministic static pass (single-impl interfaces, single-product factories, wrappers, one-export files, dead flags/config, hand-rolled stdlib), optional LLM judge pass, // sin-debt: marker approval.
• cmd/sin-code/audit_cmd.go — sin-code audit complexity with --path, --format, --tags, --rank, --since, --max-net-lines, --strict, --no-llm.
• cmd/sin-code/ceo-audit_cmd.go — 48-gate CEO audit with complexity-audit as gate 48; score contribution +1 per 100 removable lines.
• cmd/sin-code/internal/audit/complexity_test.go + cmd/sin-code/audit_cmd_test.go — race-free tests.
• docs/complexity-audit.md, AGENTS.md, CHANGELOG.md — docs.

Verification

• go build ./... ok
• go test -race -count=1 ./cmd/sin-code/internal/audit/ -v ok
• go test -race -count=1 ./cmd/sin-code/ -run 'TestAuditCommand|TestCEOAUDIT' -v ok
• golangci-lint (new files) ok
• govulncheck ./... ok
• gosec audit package clean ok
• python3 scripts/validate_skill.py --all-bundled --strict ok

[vercel]

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Project	Deployment	Actions	Updated (UTC)
sin-code	Ready	Preview, Comment, Open in v0	Jun 16, 2026 7:38pm

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[github-actions]

🏆 CEO Audit — A+ (100.0/100)

Metric	Value
Grade	A+
Score	100.0/100
Critical findings	0
High findings	0
Profile	QUICK
Min grade gate	B

📥 Download full report (Markdown)
📊 Download SARIF (for Code Scanning)

Run ~/.config/opencode/skills/ceo-audit/scripts/audit.sh . --profile=QUICK locally to reproduce.

[github-actions]

🏆 CEO Audit — A+ (100.0/100)

Metric	Value
Grade	A+
Score	100.0/100
Critical findings	0
High findings	0
Medium findings	0
Profile	QUICK
Min grade gate	B

📥 Download full report (Markdown)

Run ID: 27643154812 · Commit: ${github.sha}

Run ~/.config/opencode/skills/ceo-audit/scripts/audit.sh . --profile=QUICK locally to reproduce.