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/trekbrief-template.md

@@ -14,8 +14,8 @@ source: {interview | manual}
 
 # Task: {title}
 
-> Generated by `/ultrabrief-local` on {YYYY-MM-DD}.
-> This brief is the contract between requirements and planning. `/ultraplan-local`
+> Generated by `/trekbrief` on {YYYY-MM-DD}.
+> This brief is the contract between requirements and planning. `/trekplan`
 > reads it to produce the implementation plan. Every decision in the plan must
 > trace back to content in this brief.
 
@@ -81,9 +81,9 @@ Do NOT write vague criteria:
 
 ## Research Plan
 
-*Explicit research topics that must be answered before `/ultraplan-local` can
+*Explicit research topics that must be answered before `/trekplan` can
 produce a high-confidence plan. Each topic is phrased as a research question ready
-to feed into `/ultraresearch-local`. Topics may be empty (N=0) for trivial tasks
+to feed into `/trekresearch`. Topics may be empty (N=0) for trivial tasks
 where the codebase alone is sufficient context.*
 
 {If research_topics = 0, write a single line: "No external research needed —
@@ -93,9 +93,9 @@ the codebase and this brief contain sufficient context for planning."}
 
 - **Why this matters:** {How the plan depends on this answer. Which steps or
   decisions cannot be made confidently without it.}
-- **Research question:** "{Exact question to feed to /ultraresearch-local.
+- **Research question:** "{Exact question to feed to /trekresearch.
   One sentence, ends in `?`.}"
-- **Suggested invocation:** `/ultraresearch-local --project {project_dir} --external "{question}"`
+- **Suggested invocation:** `/trekresearch --project {project_dir} --external "{question}"`
 - **Required for plan steps:** {which kinds of steps will consume this — e.g.,
   "migration strategy", "library selection", "threat model"}
 - **Confidence needed:** {high | medium | low}
@@ -106,7 +106,7 @@ the codebase and this brief contain sufficient context for planning."}
 
 - **Why this matters:** ...
 - **Research question:** "..."
-- **Suggested invocation:** `/ultraresearch-local --project {project_dir} ...`
+- **Suggested invocation:** `/trekresearch --project {project_dir} ...`
 - **Required for plan steps:** ...
 - **Confidence needed:** ...
 - **Estimated cost:** ...
@@ -133,7 +133,7 @@ failures.*
 - **Created:** {YYYY-MM-DD}
 - **Interview turns:** {N}
 - **Auto-research opted in:** {yes | no}
-- **Source:** {ultrabrief interview | manual}
+- **Source:** {trekbrief interview | manual}
 
 ---
 
@@ -143,15 +143,15 @@ Manual (default):
 
 ```bash
 # Run each research topic (order does not matter):
-/ultraresearch-local --project {project_dir} --external "{Topic 1 question}"
-/ultraresearch-local --project {project_dir} --external "{Topic 2 question}"
+/trekresearch --project {project_dir} --external "{Topic 1 question}"
+/trekresearch --project {project_dir} --external "{Topic 2 question}"
 
 # Then plan:
-/ultraplan-local --project {project_dir}
+/trekplan --project {project_dir}
 
 # Then execute:
-/ultraexecute-local --project {project_dir}
+/trekexecute --project {project_dir}
 ```
 
-Auto (opt-in during `/ultrabrief-local`): research and planning run
+Auto (opt-in during `/trekbrief`): research and planning run
 automatically; only execution is manual.