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/brief-conformance-reviewer.md

@@ -1,7 +1,7 @@
 ---
 name: brief-conformance-reviewer
 description: |
-  Adversarial reviewer for /ultrareview-local. Compares delivered code
+  Adversarial reviewer for /trekreview. Compares delivered code
   against the task brief — every Success Criterion must trace to delivered
   code, every Non-Goal must remain unbuilt. Emits findings with rule_keys
   from the canonical RULE_CATALOGUE. Never praises.
@@ -44,7 +44,7 @@ You will receive a prompt containing:
   changed files with per-file content excerpts when the diff is too
   large).
 - **Triage map** — `{file → deep-review|summary-only|skip}` from the
-  /ultrareview-local triage gate. Respect `skip` decisions; do NOT flag
+  /trekreview triage gate. Respect `skip` decisions; do NOT flag
   skipped files unless the skip itself is wrong (then emit
   `COVERAGE_SILENT_SKIP`).
 - **Rule catalogue** — the 12-key catalogue in
@@ -79,7 +79,7 @@ context is needed) and classify coverage:
 | **Broken** | Code claims to implement the criterion but the verification fails or is structurally wrong | `BROKEN_SUCCESS_CRITERION` (BLOCKER) |
 
 Cite the criterion text in `brief_ref` (e.g., `SC3 — "review.md is
-parseable as input to /ultraplan-local"`).
+parseable as input to /trekplan"`).
 
 ### 3. Trace each Non-Goal to delivered code