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/validators/session-state-validator.mjs

@@ -1,5 +1,5 @@
 // lib/validators/session-state-validator.mjs
-// Validate .session-state.local.json — the contract consumed by /ultracontinue.
+// Validate .session-state.local.json — the contract consumed by /trekcontinue.
 // Schema v1 documented in docs/HANDOVER-CONTRACTS.md (Handover 7).
 
 import { readFileSync, existsSync } from 'node:fs';
@@ -18,8 +18,8 @@ export const SESSION_STATE_REQUIRED_TOP = [
 // session is not resumable. Unknown statuses fail.
 export const SESSION_STATE_VALID_STATUSES = ['in_progress', 'partial', 'failed', 'stopped', 'completed'];
 
-// Statuses that /ultracontinue can resume from. `completed` is intentionally
-// excluded — running ultracontinue on a completed project should signal "no
+// Statuses that /trekcontinue can resume from. `completed` is intentionally
+// excluded — running trekcontinue on a completed project should signal "no
 // further sessions to resume", not load stale context.
 export const SESSION_STATE_RESUMABLE_STATUSES = ['in_progress', 'partial', 'failed', 'stopped'];