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/hooks/scripts/pre-compact-flush.mjs

@@ -2,12 +2,12 @@
 // Hook: pre-compact-flush.mjs
 // Event: PreCompact (Claude Code v2.1.105+)
 // Purpose: Flush progress.json drift before context compaction so
-//          /ultraexecute-local --resume works after long conversations.
+//          /trekexecute --resume works after long conversations.
 //          Direct fix for the documented P0 in
-//          docs/ultraexecute-v2-observations-from-config-audit-v4.md.
+//          docs/trekexecute-v2-observations-from-config-audit-v4.md.
 //
 //          v3.3.0: also refreshes sibling .session-state.local.json
-//          (Handover 7) so /ultracontinue can detect a resumable session
+//          (Handover 7) so /trekcontinue can detect a resumable session
 //          even after a compaction event mid-run.
 //
 // Behavior: