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/lib/util/autonomy-gate.mjs

@@ -1,5 +1,5 @@
 // lib/util/autonomy-gate.mjs
-// Autonomy-gate state machine for /ultraexecute-local + /ultraplan-local
+// Autonomy-gate state machine for /trekexecute + /trekplan
 // (plan-v2 Step 4 — drives the --gates flag).
 //
 // States:

plugins/ultraplan-local/lib/util/cleanup.mjs

@@ -1,7 +1,7 @@
 // lib/util/cleanup.mjs
 // Bug 4 — operator-invoked cleanup of completed-project state files.
 //
-// The ultraplan-local pipeline does NOT auto-cleanup state on session-end:
+// The trekplan pipeline does NOT auto-cleanup state on session-end:
 // stale .session-state.local.json + NEXT-SESSION-PROMPT.local.md across many
 // projects accumulate over time. This util removes them safely once the
 // project is fully done (status === 'completed' as seen by validateSessionState).
@@ -11,7 +11,7 @@
 // - Idempotent: re-running on a partially-cleaned dir succeeds with deleted: [].
 // - Refuses dryRun: false without an explicit confirm: true (prevents accidents).
 // - ENOENT counts as "already absent" — never an error.
-// - Cleanup is operator-invoked from /ultracontinue --cleanup; no Bash binding here.
+// - Cleanup is operator-invoked from /trekcontinue --cleanup; no Bash binding here.
 
 import { existsSync, unlinkSync } from 'node:fs';
 import { join } from 'node:path';
@@ -24,7 +24,7 @@ const CANDIDATE_FILES = Object.freeze([
 ]);
 
 /**
- * Clean up state files for a completed ultraplan project.
+ * Clean up state files for a completed trekplan project.
  *
  * @param {string} projectDir - absolute or cwd-relative path to the project directory
  * @param {{dryRun?: boolean, confirm?: boolean}} [opts]
@@ -68,7 +68,7 @@ export function cleanupProject(projectDir, opts = {}) {
     return fail(issue(
       'CLEANUP_NOT_COMPLETED',
       `Refused: status is "${validation.parsed.status}", not "completed"`,
-      'cleanup is reserved for fully-finished projects. Resume via /ultracontinue or wait until the run completes.',
+      'cleanup is reserved for fully-finished projects. Resume via /trekcontinue or wait until the run completes.',
     ));
   }