test(evals): Voyage's fixed test set as a plugin eval suite, expectations written before the first run

Seven `claude plugin eval` cases under evals/, runs: 1, deterministic graders
only (regex, tool_used, file_exists), no ablation. Each case tests one thing
Voyage promises and stops within minutes, headless:

- plan-requires-brief, plan-project-not-initialized, plan-rejects-unknown-export,
  review-requires-project: argument guards stop before any Agent or Write.
- plan-halts-without-phase-signals: a brief_version 2.1 brief without
  phase_signals halts /trekplan at the sequencing gate, before the swarm.
- review-validate-flags-bad-finding-id (known-positive) and
  review-validate-passes-clean-review (known-negative): /trekreview --validate
  names REVIEW_BAD_FINDING_ID on a planted bad ID and stays clean on a valid file.

Each case's expected_outcome is committed here, before the suite has run.
Fixtures are written by an inline scaffold.sh (needs --scaffold): chose inline
heredocs because a run cannot read the eval directory, and the add_dirs path
mapping is not documented. evals/results/ is ignored.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

evals/review-validate-flags-bad-finding-id/case.yaml

@@ -0,0 +1,4 @@
+schema_version: "1.1"
+name: review-validate-flags-bad-finding-id
+context:
+  scaffold_script: scaffold.sh

evals/review-validate-flags-bad-finding-id/graders/names-rule.md

@@ -0,0 +1,5 @@
+---
+type: regex
+pattern: "REVIEW_BAD_FINDING_ID"
+target: trace
+---

evals/review-validate-flags-bad-finding-id/graders/no-agent.md

@@ -0,0 +1,6 @@
+---
+type: tool_used
+tool: Agent
+min: 0
+max: 0
+---

evals/review-validate-flags-bad-finding-id/graders/no-write.md

@@ -0,0 +1,6 @@
+---
+type: tool_used
+tool: Write
+min: 0
+max: 0
+---

evals/review-validate-flags-bad-finding-id/graders/says-fail.md

@@ -0,0 +1,4 @@
+---
+type: regex
+pattern: "FAIL"
+---

evals/review-validate-flags-bad-finding-id/graders/validator-ran.md

@@ -0,0 +1,5 @@
+---
+type: tool_used
+tool: Bash
+input_match: "review-validator"
+---

evals/review-validate-flags-bad-finding-id/prompt.md

@@ -0,0 +1,11 @@
+---
+description: "KNOWN-POSITIVE. /trekreview --validate on a review.md whose finding ID is not 40-char hex fails and names the rule."
+expected_outcome: "review-validator runs and reports REVIEW_BAD_FINDING_ID; the one-line summary says FAIL; no Agent call, no file written."
+tags: [proevesett]
+runs: 1
+max_turns: 10
+timeout_seconds: 300
+allowed_tools: [Bash, Read, Glob, Grep, Write, Agent]
+---
+
+/voyage:trekreview --project proj --validate

evals/review-validate-flags-bad-finding-id/scaffold.sh

@@ -0,0 +1,79 @@
+#!/bin/bash
+# Seeds the empty run workspace with a project folder whose review.md carries a finding ID that is not 40-char hex.
+# Self-contained on purpose: the run cannot read the eval directory, and the
+# fixtures are written inline so no path outside the workspace is involved.
+set -eu
+mkdir -p proj
+cat > proj/brief.md <<'BRIEF'
+---
+type: trekbrief
+brief_version: "2.1"
+created: 2026-09-23
+task: "Eval fixture: add a greeting helper"
+slug: eval-greeting
+project_dir: proj/
+research_topics: 0
+research_status: skipped
+auto_research: false
+interview_turns: 1
+source: fixture
+phase_signals:
+  - phase: plan
+    effort: low
+  - phase: review
+    effort: low
+---
+
+# Task: add a greeting helper
+
+## Intent
+
+Eval fixture for the Voyage proevesett. Not a real task.
+
+## Goal
+
+A function `greet(name)` returns `Hello, <name>!`.
+
+## Success Criteria
+
+- `greet("Ada")` returns `Hello, Ada!`.
+BRIEF
+cat > proj/review.md <<'REVIEW'
+---
+type: trekreview
+review_version: "1.0"
+created: 2026-09-23
+task: "Eval fixture: add a greeting helper"
+slug: eval-greeting
+project_dir: proj/
+brief_path: proj/brief.md
+scope_sha_start: 0123456789abcdef0123456789abcdef01234567
+scope_sha_end: fedcba9876543210fedcba9876543210fedcba98
+reviewed_files_count: 1
+verdict: ALLOW
+findings:
+  - F-001
+---
+
+# Review: add a greeting helper
+
+## Executive Summary
+
+Eval fixture. One SUGGESTION, verdict ALLOW.
+
+## Coverage
+
+One file reviewed: `src/greet.js`.
+
+## Findings (SUGGESTION)
+
+- `src/greet.js:1` - name the parameter more descriptively.
+
+## Remediation Summary
+
+Nothing blocks. The suggestion is optional.
+
+```json
+{"findings":[{"id":"d2d0e27875ae9ef0d818cb08bb6f14e6d33c4232","severity":"SUGGESTION","file":"src/greet.js","line":1,"rule_key":"naming","title":"Parameter name","detail":"Eval fixture.","recommended_action":"Rename the parameter."}]}
+```
+REVIEW