test(voyage): add 4 brief fixtures for v5.1.1 runtime scenarios

plugins/voyage/tests/fixtures/brief-effort-standard.md

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+---
+type: trekbrief
+brief_version: "2.1"
+created: 2026-05-14
+task: "Fixture: standard-effort all phases, no model (v5.1.1 runtime test)"
+slug: brief-effort-standard
+project_dir: .claude/projects/2026-05-14-brief-effort-standard/
+research_topics: 0
+research_status: complete
+auto_research: false
+interview_turns: 4
+source: fixture
+phase_signals:
+  - phase: research
+    effort: standard
+  - phase: plan
+    effort: standard
+  - phase: execute
+    effort: standard
+  - phase: review
+    effort: standard
+---
+
+# Task: Standard-effort fixture (no model override)
+
+## Intent
+
+Test fixture for v5.1.1 runtime resolver tests — all 4 phases at the
+standard tier WITHOUT explicit model fields. This is the operator-skipped
+model path that should fall through to the profile.
+
+## Goal
+
+Resolver returns `{effort: 'standard', model: undefined}` for each of the 4
+PHASE_SIGNAL_PHASES. The orchestrator-model path then falls through to the
+active profile's phase_models.
+
+## Success Criteria
+
+- Validator passes.
+- resolvePhaseSignal(fm, phase).model is undefined.
+- resolvePhaseSignal(fm, phase).effort is 'standard'.