chore(voyage): pin all sub-agents to Opus permanently (operator request)

Flip model: sonnet → model: opus across 20 agent files, 4 prose references
in commands (trekplan, trekresearch), trekendsession command frontmatter,
and CLAUDE.md tables. Aligns CLAUDE.md premium-profile row to actual
premium.yaml content (all-opus, which has been the case since v4.1.0 but
the doc was drift). Companion to VOYAGE_PROFILE=premium env-var (set in
~/.zshenv same day) — env-var governs orchestrator phase model; this
commit governs sub-agent models which are frontmatter-pinned and not
reachable by the profile resolver.

npm test: 516 pass, 0 fail, 2 skipped (unchanged from baseline).

Operator rationale: complete Opus coverage across all Voyage activity,
including the 20 sub-agents that the profile system does not control
(architecture-mapper, task-finder, plan-critic, scope-guardian,
brief-reviewer, code-correctness-reviewer, brief-conformance-reviewer,
review-coordinator, session-decomposer, plus the 6 researcher agents,
plus the 5 codebase-analysis agents).

Cost implication: sub-agent runs ~5x more expensive vs sonnet. Accepted.

plugins/voyage/CLAUDE.md

@@ -18,7 +18,7 @@ Voyage — a contract-driven Claude Code pipeline: brief, research, plan, execut
 | `/trekexecute` | Execute — disciplined plan/session-spec executor with failure recovery | opus |
 | `/trekreview` | Review — independent post-hoc review of delivered code against the brief. Produces `review.md` with severity-tagged findings (Handover 6) | opus |
 | `/trekcontinue` | Continue — resumes the next session of a multi-session voyage project. Reads `.session-state.local.json` (Handover 7) and immediately begins executing | opus |
-| `/trekendsession` | End-session — mark the current session complete and write session-state pointing at the next session. Helper for informal multi-session flows | sonnet |
+| `/trekendsession` | End-session — mark the current session complete and write session-state pointing at the next session. Helper for informal multi-session flows | opus |
 
 ### /trekbrief modes
 
@@ -109,26 +109,26 @@ The triage gate is deterministic — path-pattern classifier produces `{file →
 | planning-orchestrator | opus | Inline reference documentation for the planning pipeline workflow (brief-driven) |
 | research-orchestrator | opus | Inline reference documentation for the research pipeline workflow |
 | review-orchestrator | opus | Inline reference documentation for the review pipeline workflow |
-| architecture-mapper | sonnet | Codebase structure, tech stack, patterns |
-| dependency-tracer | sonnet | Import chains, data flow, side effects |
-| task-finder | sonnet | Task-relevant files, functions, reuse candidates |
-| risk-assessor | sonnet | Risks, edge cases, failure modes |
-| test-strategist | sonnet | Test patterns, coverage gaps, strategy |
-| git-historian | sonnet | Recent changes, ownership, hot files |
-| research-scout | sonnet | External docs for unfamiliar tech (conditional, planning only) |
-| convention-scanner | sonnet | Coding conventions: naming, style, error handling, test patterns |
-| brief-reviewer | sonnet | Task brief quality (5 dimensions: completeness, consistency, testability, scope clarity, research plan validity) |
-| brief-conformance-reviewer | sonnet | Brief conformance review (SC + Non-Goal traceability) |
-| code-correctness-reviewer | sonnet | Code correctness review (7 dimensions) |
-| review-coordinator | sonnet | Judge Agent — dedup + reasonableness filter + verdict |
-| plan-critic | sonnet | Adversarial plan review (9 dimensions) |
-| scope-guardian | sonnet | Scope alignment (creep + gaps) |
-| session-decomposer | sonnet | Splits plans into headless sessions with dependency graph |
-| docs-researcher | sonnet | Official documentation, RFCs, vendor docs (Tavily, MS Learn) |
-| community-researcher | sonnet | Community experience: issues, blogs, discussions |
-| security-researcher | sonnet | CVEs, audit history, supply chain risks |
-| contrarian-researcher | sonnet | Counter-evidence, overlooked alternatives |
-| gemini-bridge | sonnet | Gemini Deep Research second opinion (conditional) |
+| architecture-mapper | opus | Codebase structure, tech stack, patterns |
+| dependency-tracer | opus | Import chains, data flow, side effects |
+| task-finder | opus | Task-relevant files, functions, reuse candidates |
+| risk-assessor | opus | Risks, edge cases, failure modes |
+| test-strategist | opus | Test patterns, coverage gaps, strategy |
+| git-historian | opus | Recent changes, ownership, hot files |
+| research-scout | opus | External docs for unfamiliar tech (conditional, planning only) |
+| convention-scanner | opus | Coding conventions: naming, style, error handling, test patterns |
+| brief-reviewer | opus | Task brief quality (5 dimensions: completeness, consistency, testability, scope clarity, research plan validity) |
+| brief-conformance-reviewer | opus | Brief conformance review (SC + Non-Goal traceability) |
+| code-correctness-reviewer | opus | Code correctness review (7 dimensions) |
+| review-coordinator | opus | Judge Agent — dedup + reasonableness filter + verdict |
+| plan-critic | opus | Adversarial plan review (9 dimensions) |
+| scope-guardian | opus | Scope alignment (creep + gaps) |
+| session-decomposer | opus | Splits plans into headless sessions with dependency graph |
+| docs-researcher | opus | Official documentation, RFCs, vendor docs (Tavily, MS Learn) |
+| community-researcher | opus | Community experience: issues, blogs, discussions |
+| security-researcher | opus | CVEs, audit history, supply chain risks |
+| contrarian-researcher | opus | Counter-evidence, overlooked alternatives |
+| gemini-bridge | opus | Gemini Deep Research second opinion (conditional) |
 
 ## Quality infrastructure (v3.4.0)
 
@@ -189,9 +189,9 @@ Three built-in model profiles plus operator-defined `<custom>.yaml`. Each profil
 
 | Profile | Brief | Research | Plan | Execute | Review | Continue | Use case |
 |---------|-------|----------|------|---------|--------|----------|----------|
-| `economy` | sonnet | sonnet | sonnet | sonnet | sonnet | sonnet | Lowest cost; high-confidence small-scope tasks |
-| `balanced` (default) | sonnet | sonnet | opus | sonnet | opus | sonnet | Default — opus where reasoning depth pays off |
-| `premium` | opus | sonnet | opus | sonnet | opus | sonnet | Critical-path planning + review when budget allows |
+| `economy` | sonnet | sonnet | sonnet | sonnet | sonnet | sonnet | Lowest cost; high-confidence small-scope tasks (operator-opt-in via `--profile economy`) |
+| `balanced` | sonnet | sonnet | opus | sonnet | opus | sonnet | Mixed — opus where reasoning depth pays off (operator-opt-in via `--profile balanced`) |
+| `premium` (default) | opus | opus | opus | opus | opus | opus | Maximum quality — Opus on every phase. Default since 2026-05-13 operator request; also the hardcoded resolver default at `lib/profiles/resolver.mjs:145` |
 
 ### Lookup order
 

plugins/voyage/agents/architecture-mapper.md

@@ -21,7 +21,7 @@ description: |
   Direct architecture analysis request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: cyan
 tools: ["Read", "Glob", "Grep", "Bash"]
 ---

plugins/voyage/agents/brief-conformance-reviewer.md

@@ -5,7 +5,7 @@ description: |
   against the task brief — every Success Criterion must trace to delivered
   code, every Non-Goal must remain unbuilt. Emits findings with rule_keys
   from the canonical RULE_CATALOGUE. Never praises.
-model: sonnet
+model: opus
 color: magenta
 tools: ["Read", "Glob", "Grep"]
 ---

plugins/voyage/agents/brief-reviewer.md

@@ -23,7 +23,7 @@ description: |
   Brief review request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: magenta
 tools: ["Read", "Glob", "Grep"]
 ---

plugins/voyage/agents/code-correctness-reviewer.md

@@ -6,7 +6,7 @@ description: |
   cross-file regressions, test coverage gaps, placeholder code, security
   surface, hidden dependencies. Cites file:line for every finding. Never
   praises.
-model: sonnet
+model: opus
 color: red
 tools: ["Read", "Glob", "Grep"]
 ---

plugins/voyage/agents/community-researcher.md

@@ -24,7 +24,7 @@ description: |
   finds the practical signal that helps teams make adoption decisions.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: green
 tools: ["WebSearch", "WebFetch", "mcp__tavily__tavily_search", "mcp__tavily__tavily_research"]
 ---

plugins/voyage/agents/contrarian-researcher.md

@@ -24,7 +24,7 @@ description: |
   but to ensure the final recommendation is genuinely considered.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: red
 tools: ["WebSearch", "WebFetch", "mcp__tavily__tavily_search", "mcp__tavily__tavily_research"]
 ---

plugins/voyage/agents/convention-scanner.md

@@ -23,7 +23,7 @@ description: |
   Direct convention discovery request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: yellow
 tools: ["Read", "Glob", "Grep", "Bash"]
 ---

plugins/voyage/agents/dependency-tracer.md

@@ -21,7 +21,7 @@ description: |
   Impact analysis request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: blue
 tools: ["Read", "Glob", "Grep", "Bash"]
 ---

plugins/voyage/agents/docs-researcher.md

@@ -23,7 +23,7 @@ description: |
   microsoft_docs_fetch) that docs-researcher uses for higher-quality results.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: blue
 tools: ["WebSearch", "WebFetch", "Read", "mcp__tavily__tavily_search", "mcp__tavily__tavily_research", "mcp__microsoft-learn__microsoft_docs_search", "mcp__microsoft-learn__microsoft_docs_fetch"]
 ---

plugins/voyage/agents/gemini-bridge.md

@@ -24,7 +24,7 @@ description: |
   Direct request for Gemini research on a complex architectural question triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: magenta
 tools: ["mcp__gemini-mcp__gemini_deep_research", "mcp__gemini-mcp__gemini_get_research_status", "mcp__gemini-mcp__gemini_get_research_result", "mcp__gemini-mcp__gemini_research_followup"]
 ---

plugins/voyage/agents/git-historian.md

@@ -21,7 +21,7 @@ description: |
   Git history analysis request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: yellow
 tools: ["Bash", "Read", "Glob", "Grep"]
 ---

plugins/voyage/agents/plan-critic.md

@@ -21,7 +21,7 @@ description: |
   Plan review request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: red
 tools: ["Read", "Glob", "Grep"]
 ---

plugins/voyage/agents/planning-orchestrator.md

@@ -137,7 +137,7 @@ medium: default, large: default) rather than dropping agents.
 | `research-scout` | Conditional | Conditional | Conditional | External docs (only when unfamiliar tech detected AND not covered by briefs) |
 | `convention-scanner` | No | Yes | Yes | Coding conventions, naming, style, test patterns |
 
-**Convention Scanner** — use the `convention-scanner` plugin agent (model: "sonnet")
+**Convention Scanner** — use the `convention-scanner` plugin agent (model: "opus")
 for medium+ codebases only. Pass the task description as context.
 
 **research-scout** — launch conditionally if the task involves technologies, APIs,

plugins/voyage/agents/research-scout.md

@@ -21,7 +21,7 @@ description: |
   Research request for external technology triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: blue
 tools: ["WebSearch", "WebFetch", "Read"]
 ---

plugins/voyage/agents/review-coordinator.md

@@ -6,7 +6,7 @@ description: |
   applies BOUNDED operations: deduplication, severity ranking, HubSpot
   Judge filters, Cloudflare reasonableness filter, verdict computation.
   Synthesis-level inference across files is forbidden in v1.0.
-model: sonnet
+model: opus
 color: yellow
 tools: ["Read", "Glob", "Grep"]
 ---

plugins/voyage/agents/risk-assessor.md

@@ -21,7 +21,7 @@ description: |
   Risk analysis request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: yellow
 tools: ["Read", "Glob", "Grep", "Bash"]
 ---

plugins/voyage/agents/scope-guardian.md

@@ -21,7 +21,7 @@ description: |
   Scope verification request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: magenta
 tools: ["Read", "Glob", "Grep"]
 ---

plugins/voyage/agents/security-researcher.md

@@ -23,7 +23,7 @@ description: |
   using CVE databases, OWASP categories, and verified audit reports.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: red
 tools: ["WebSearch", "WebFetch", "mcp__tavily__tavily_search", "mcp__tavily__tavily_research"]
 ---

plugins/voyage/agents/session-decomposer.md

@@ -22,7 +22,7 @@ description: |
   Plan decomposition request for parallel headless execution.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: green
 tools: ["Read", "Glob", "Grep", "Write"]
 ---

plugins/voyage/agents/task-finder.md

@@ -22,7 +22,7 @@ description: |
   Direct code discovery request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: green
 tools: ["Read", "Glob", "Grep", "Bash"]
 ---

plugins/voyage/agents/test-strategist.md

@@ -21,7 +21,7 @@ description: |
   Test planning request triggers the agent.
   </commentary>
   </example>
-model: sonnet
+model: opus
 color: green
 tools: ["Read", "Glob", "Grep", "Bash"]
 ---

plugins/voyage/commands/trekendsession.md

@@ -2,7 +2,7 @@
 name: trekendsession
 description: Mark the current session as complete and write session-state pointing at the next session. Helper for informal multi-session flows.
 argument-hint: "<next-brief-path> <next-label> | --help"
-model: sonnet
+model: opus
 ---
 
 # Voyage End-Session Local v1.0

plugins/voyage/commands/trekplan.md

@@ -501,7 +501,7 @@ ownership, hot files, and active branches that may affect planning."
 
 ### Launch for medium+ codebases (50+ files):
 
-**Convention Scanner** — use the `convention-scanner` plugin agent (model: "sonnet")
+**Convention Scanner** — use the `convention-scanner` plugin agent (model: "opus")
 for medium+ codebases only.
 Provide concrete examples from the codebase, not generic advice."
 
@@ -538,7 +538,7 @@ Common reasons for deep-dives:
 - A test pattern was identified but the test infrastructure needs more detail
 - A risk was flagged but the actual impact needs verification
 
-For each significant gap, spawn a targeted deep-dive agent (model: "sonnet",
+For each significant gap, spawn a targeted deep-dive agent (model: "opus",
 subagent_type: "Explore") with a narrow, specific brief.
 
 Launch up to 3 deep-dive agents in parallel. If no gaps exist, skip this phase

plugins/voyage/commands/trekresearch.md

@@ -291,7 +291,7 @@ other agents — the value of Gemini is independence.
 ### Launch rules
 
 - Launch ALL selected agents **in parallel** in a single message
-- Use model: "sonnet" for all sub-agents (the orchestrator runs on Opus)
+- Use model: "opus" for all sub-agents (the orchestrator runs on Opus)
 - Scale maxTurns by codebase size for local agents (same as trekplan):
   small = halved, medium/large = default
 - convention-scanner: medium+ codebases only (50+ files)
@@ -301,7 +301,7 @@ other agents — the value of Gemini is independence.
 Review all agent results. Identify knowledge gaps — areas where findings are
 thin, contradictory, or missing.
 
-For each significant gap, launch a targeted follow-up agent (model: "sonnet")
+For each significant gap, launch a targeted follow-up agent (model: "opus")
 with a narrow, specific brief. Maximum 2 follow-ups.
 
 If no gaps exist, skip: "Initial research sufficient — no follow-ups needed."