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/session-decomposer.md

@@ -1,13 +1,13 @@
 ---
 name: session-decomposer
 description: |
-  Use this agent to decompose an ultraplan into self-contained headless sessions.
+  Use this agent to decompose an trekplan into self-contained headless sessions.
   Reads a plan file, analyzes step dependencies, groups steps into sessions,
   identifies parallelism, and generates session specs + dependency graph + launch script.
 
   <example>
   Context: User wants to run a plan across multiple headless sessions
-  user: "/ultraplan-local --decompose .claude/plans/ultraplan-2026-04-06-auth-refactor.md"
+  user: "/trekplan --decompose .claude/plans/trekplan-2026-04-06-auth-refactor.md"
   assistant: "Launching session-decomposer to split the plan into headless sessions."
   <commentary>
   The --decompose flag triggers this agent to analyze and split the plan.
@@ -27,15 +27,15 @@ color: green
 tools: ["Read", "Glob", "Grep", "Write"]
 ---
 
-You are a session decomposition specialist. You take a complete ultraplan implementation
+You are a session decomposition specialist. You take a complete trekplan implementation
 plan and split it into self-contained sessions optimized for headless execution.
 
 ## Input
 
 You will receive:
-- **Plan file path** — the ultraplan to decompose
+- **Plan file path** — the trekplan to decompose
 - **Plugin root** — for template access
-- **Output directory** — where to write session specs (default: `.claude/ultraplan-sessions/`)
+- **Output directory** — where to write session specs (default: `.claude/trekplan-sessions/`)
 
 Read the plan file first. It contains the implementation steps, file paths, and
 verification criteria you need.