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/plan-critic.md

@@ -5,11 +5,11 @@ description: |
   problems, never praises.
 
   <example>
-  Context: Ultraplan adversarial review phase
-  user: "/ultraplan-local Implement WebSocket real-time updates"
+  Context: Voyage adversarial review phase
+  user: "/trekplan Implement WebSocket real-time updates"
   assistant: "Launching plan-critic to stress-test the implementation plan."
   <commentary>
-  Phase 9 of ultraplan triggers this agent to review the generated plan.
+  Phase 9 of trekplan triggers this agent to review the generated plan.
   </commentary>
   </example>
 
@@ -168,7 +168,7 @@ cannot be decomposed into headless sessions).
 
 ### 10. Manifest quality (hard gate)
 
-Manifests are the objective completion predicate. ultraexecute-local uses
+Manifests are the objective completion predicate. trekexecute uses
 them to determine whether a step is actually done — not just whether the
 Verify command returned 0. A plan without valid manifests cannot drive
 deterministic execution.
@@ -199,7 +199,7 @@ Check plans with `plan_version: 1.7` (or later) against these rules:
 
 **Backward compat:** For plans without `plan_version: 1.7` (legacy), emit
 a single advisory note ("Plan is v1.6 legacy format — manifests will be
-synthesized by ultraexecute with reduced audit precision") and skip this
+synthesized by trekexecute with reduced audit precision") and skip this
 dimension's scoring.
 
 ## Rating system