feat(voyage)!: bulk content rewrite ultra -> voyage/trek prose [skip-docs]

Sed-pipeline (16 patterns, longest-match-first) sweeper residuelle ultra*-treff
i prose, command-narrativ, agent-prompts, hook-kommentarer, doc-prosa.

Pipeline-utvidelser fra V4-prompten:
- BSD-syntax [[:<:]]ultra[[:>:]] istedenfor \bultra\b (BSD sed mangler \b)
- 6 compound-patterns for ultraplan/ultraexecute/ultraresearch/ultrabrief/
  ultrareview/ultracontinue uten -local-suffiks
- ultra*-stats glob -> trek*-stats glob
- Linje-eksklusjon redusert til ultra-cc-architect (Q8); session-state-
  eksklusjonen var over-protektiv
- File-eksklusjon utvidet til settings.json, package.json, plugin.json,
  hele .claude/-treet (gitignored + V5-territorium)

Q8-undantak holdt: architecture-discovery.mjs + project-discovery.mjs urort.
Filnavn-konvensjon holdt: .session-state.local.json + *.local.* preservert.

Manuell narrative-fix: tests/lib/agent-frontmatter.test.mjs linje 10
mangled "/ultra*-local" til "/voyage*-local" (ingen slik kommando finnes);
korrigert til "/trek*".

Residualer utenfor scope (V5 handterer): package.json + .claude-plugin/
plugin.json (Step 12-14 versjons-bump). .claude/* er gitignored
spec-historikk med tilsiktet BEFORE/AFTER-narrativ.

Part of voyage-rebrand session 3 (Wave 4 / Step 10).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/ultraplan-local/agents/research-orchestrator.md

@@ -2,11 +2,11 @@
 name: research-orchestrator
 description: |
   Inline reference (v2.4.0) — documents the research workflow that
-  /ultraresearch-local executes in main context. This file is NOT spawned as
+  /trekresearch executes in main context. This file is NOT spawned as
   a sub-agent anymore. The Claude Code harness does not expose the Agent tool
   to sub-agents, so an orchestrator launched with run_in_background: true
   cannot spawn the research swarm and would degrade to single-context
-  reasoning. The /ultraresearch-local command now orchestrates the phases
+  reasoning. The /trekresearch command now orchestrates the phases
   below directly in the main session.
 model: opus
 color: cyan
@@ -20,12 +20,12 @@ tools: ["Agent", "Read", "Glob", "Grep", "Write", "Edit", "Bash"]
      Orchestrator Phase 4   = Command Phase 7  (Triangulation)
      Orchestrator Phase 5   = Command Phase 8  (Synthesis + write brief)
      Orchestrator Phase 6   = Command Phase 9  (Completion)
-     As of v2.4.0, /ultraresearch-local runs these phases inline in main
+     As of v2.4.0, /trekresearch runs these phases inline in main
      context instead of spawning this agent. Keep this file as the canonical
      reference for what those phases do. -->
 
-This document is the canonical workflow description for the ultraresearch
-pipeline as of v2.4.0. The `/ultraresearch-local` command reads it as
+This document is the canonical workflow description for the trekresearch
+pipeline as of v2.4.0. The `/trekresearch` command reads it as
 reference and executes the phases below **inline in the main command
 context**. It is no longer spawned as a background sub-agent — that mode
 silently lost the Agent tool and degraded the swarm to single-context
@@ -140,7 +140,7 @@ If no gaps exist, skip: "Initial research sufficient — no follow-ups needed."
 
 ### Phase 4 — Triangulation
 
-This is the KEY phase that makes ultraresearch more than aggregation.
+This is the KEY phase that makes trekresearch more than aggregation.
 
 For each dimension of the research question:
 
@@ -208,7 +208,7 @@ When done, your output message should contain:
 
 You can:
 - Read the full brief at {brief path}
-- Feed into planning: /ultraplan-local --research {brief path} <task>
+- Feed into planning: /trekplan --research {brief path} <task>
 - Ask follow-up questions
 ```