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/templates/session-spec-template.md

@@ -23,7 +23,7 @@ the purpose and make judgment calls.}
 ## Session Manifest
 
 Machine-readable aggregate of all step manifests in this session. Used by
-ultraexecute-local for independent Phase 7.5 audit.
+trekexecute for independent Phase 7.5 audit.
 
 ```yaml
 session_manifest:
@@ -69,7 +69,7 @@ session_manifest:
   ```
 
 *Step 0 runs in the same sandbox as all real work. If it exits 77,
-ultraexecute-local marks the session `blocked` and does NOT proceed. This
+trekexecute marks the session `blocked` and does NOT proceed. This
 catches the fail-late push-denial mode observed in Wave 1.*
 
 *Escape hatch:* set `TREKEXECUTE_SKIP_PREFLIGHT=1` in the environment to
@@ -146,10 +146,10 @@ introduced. This section bridges sessions — it's the "baton" in a relay race.}
 ## Recovery Metadata
 
 *This section is populated only when this session spec was generated by the
-ultraexecute-local Phase 7.6 recovery dispatcher. Omit for normal sessions.*
+trekexecute Phase 7.6 recovery dispatcher. Omit for normal sessions.*
 
 - **Recovery of:** `{original session spec path}`
 - **Recovery depth:** {1 | 2}
 - **Missing steps (reason for recovery):** {step numbers + drift summary}
 - **Entry condition override:** {e.g., "previous partial session committed at {sha}"}
-- **Parent progress file:** `{path to .ultraexecute-progress-*.json}`
+- **Parent progress file:** `{path to .trekexecute-progress-*.json}`