Complete SOW-0049 Opencode complexity reduction

[ktsaou]

Summary

• Complete SOW-0049 Opencode adapter complexity reduction.
• Add deterministic Opencode scan and tail benchmarks, plus benchmark-gate inventory updates.
• Harden read-only SQLite DSN handling, CLI source path normalization, source identity propagation, and cursor target guards.
• Move SOW-0049 to completed.

Validation

• ./scripts/gates.sh passed locally.
• git diff --check && git diff --cached --check passed.
• scripts/spec-drift.sh passed.
• scripts/scan-secrets.sh passed.
• External review converged through Round 12.

---

Summary by cubic

Completes SOW-0049 by simplifying the opencode adapter and hardening its read‑only SQLite handling. Adds deterministic Scan/Tail benchmarks and raises the performance gate to 11 required benchmarks.

• Refactors
  • opencode: split complex paths into helpers (batch collection, row handlers, WAL watcher, LLM op close) for clearer control flow and fewer branches.
  • Cursor safety: added TargetHash; scan/tail now guard against DB target changes and reset watermarks when mismatched; snapshot seeds the hash.
  • Source identity: introduced AdapterOptions.SourceID; all adapters default to format:location when unset; CLI normalizes opencode locations to absolute paths and passes a stable SourceID.
  • Read‑only DSN: rebuilt via strict allowlist; bare paths treated as opaque; supports literal ?/:memory: in filenames; new normalization/validation and tests.
  • Benchmarks/gates: added opencode Scan/Tail benchmarks; stabilized internal/notify bench; updated bench/baseline.txt, scripts/check-bench.sh, and CI to enforce 11 benchmarks; docs/specs updated; SOW moved to done.

^{Written for commit 7502ce8. Summary will update on new commits.}

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 220 complexity · 28 duplication

Metric	Results
Complexity	220
Duplication	28

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[cubic-dev-ai]

No issues found across 48 files

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