test(ultraplan-local): add plan-determinism + review-determinism synthetic fixtures (SC7 floor)

Adds 6 files in tests/synthetic/ exercising the determinism pipeline at the
SC7 brief floor (Jaccard >= 0.833). Plan fixture pair: 40 step titles each
with 38 shared (Jaccard 0.905). Review fixture pair: 30 finding-IDs each
with 28 shared (Jaccard 0.875). Reuses lib/parsers/jaccard.mjs +
lib/parsers/finding-id.mjs.

The new pair coexists with tests/lib/review-determinism.test.mjs which
holds the older SC4 (0.70) floor against tests/fixtures/ultrareview/.
The lower floor protects pipeline regressions; the higher floor anchors
the speedup brief's determinism aspiration.

[skip-docs]

plugins/ultraplan-local/tests/synthetic/plan-run-B.md

@@ -0,0 +1,77 @@
+---
+type: ultraplan-synthetic
+plan_version: "1.7"
+created: 2026-05-04
+task: "Add --verbose flag to CLI"
+slug: verbose-flag
+run_id: B
+steps:
+  - "Add config entry for verbose flag in package.json"
+  - "Define types for verbose mode in types.ts"
+  - "Update parseArgs to recognize --verbose flag"
+  - "Pass verbose context through main entry point"
+  - "Add log level enum (silent, normal, verbose)"
+  - "Wire log level into logger module"
+  - "Replace console.log with logger.info in handler.ts"
+  - "Add tests for parseArgs --verbose recognition"
+  - "Add tests for log level enum mapping"
+  - "Update README with --verbose flag documentation"
+  - "Add CHANGELOG entry for verbose flag"
+  - "Bump package.json minor version"
+  - "Add lint rule blocking direct console usage"
+  - "Run lint and fix new violations"
+  - "Add CLI integration test for --verbose end-to-end"
+  - "Add fixture file for verbose log capture"
+  - "Document verbose output format in docs/cli.md"
+  - "Add jsdoc for new logger API"
+  - "Verify all existing tests pass with verbose disabled"
+  - "Add backward-compat test for legacy quiet behavior"
+  - "Add edge-case test for repeated --verbose flags"
+  - "Add edge-case test for --verbose with --silent collision"
+  - "Update help text to list --verbose flag"
+  - "Add usage example to docs/quickstart.md"
+  - "Verify CI matrix runs on Node 18 and 20"
+  - "Add npm script for verbose mode debugging"
+  - "Run security audit on logger dependency tree"
+  - "Verify no PII leaks in verbose log output"
+  - "Add manual test checklist to CONTRIBUTING.md"
+  - "Update .gitignore for verbose log dump files"
+  - "Add cleanup logic for stale verbose logs"
+  - "Add unit test for cleanup logic"
+  - "Verify exit code on verbose mode error"
+  - "Add stderr routing for warnings in verbose"
+  - "Add timestamp prefix in verbose log lines"
+  - "Add test for timestamp format"
+  - "Update troubleshooting guide with verbose flag"
+  - "Verify version sync across all docs"
+  - "Add benchmark for verbose log capture overhead"
+  - "Document overhead methodology in PERF.md"
+---
+
+# Synthetic plan run B — Add --verbose flag to CLI
+
+This fixture represents a second synthesized run of `/ultraplan-local` against
+the same hand-calibrated brief used for `plan-run-A.md`. The two runs differ
+on 2 step titles (modeling realistic LLM variation).
+
+## How this fixture is used
+
+See `plan-run-A.md` for the determinism contract.
+
+## Fixture math
+
+- A has 40 unique step titles
+- B has 40 unique step titles
+- Intersection (shared titles): 38
+- Union: 42
+- Jaccard: 38/42 ≈ 0.9047 (well above 0.833 floor)
+
+## Differences from run A
+
+- A includes "Add benchmark for verbose log emission cost" → B replaces with
+  "Add benchmark for verbose log capture overhead"
+- A includes "Document benchmark methodology in PERF.md" → B replaces with
+  "Document overhead methodology in PERF.md"
+
+These represent the kind of paraphrase variation a stochastic planner may
+produce on consecutive runs against an identical brief.