feat(voyage)!: rename git branch namespace ultraplan -> trek [skip-docs]

- commands/trekexecute.md: 6 ultraplan/{slug} refs -> trek/{slug}
- templates/headless-launch-template.md: 7 ultraplan/{slug} refs -> trek/{slug}
- README.md line 273: branch namespace example -> trek/{slug}

Closes the deferred V2 README.md branch-namespace update.

Part of voyage-rebrand session 2 (W3.5 / Step 7).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/ultraplan-local/README.md

@@ -270,7 +270,7 @@ Per step: apply Changes exactly as written → run Verify (exit code is truth)
 When a plan has an `## Execution Strategy` section (auto-generated by `/ultraplan-local` for plans with > 5 steps), `/ultraexecute-local` automatically:
 
 1. **Pre-flight checks** — validates clean working tree, plan file tracked in git, no scope fence overlaps between parallel sessions, no stale worktrees
-2. **Creates git worktrees** — each parallel session gets its own isolated worktree and branch (`ultraplan/{slug}/session-{N}`)
+2. **Creates git worktrees** — each parallel session gets its own isolated worktree and branch (`trek/{slug}/session-{N}`)
 3. Launches `claude -p` per session per wave, each in its own worktree
 4. **Merges branches back** sequentially with `--no-ff` after each wave completes
 5. **Cleans up** worktrees and branches unconditionally (even on failure)

plugins/ultraplan-local/commands/trekexecute.md

@@ -467,7 +467,7 @@ git worktree prune
 
 Also check for stale branches:
 ```bash
-git branch --list "ultraplan/{slug}/*" | while read b; do
+git branch --list "trek/{slug}/*" | while read b; do
   git branch -D "$b" 2>/dev/null
 done
 ```
@@ -570,7 +570,7 @@ override for long runs:
 
 For each session N in this wave:
 ```bash
-BRANCH_NAME="ultraplan/{slug}/session-{N}"
+BRANCH_NAME="trek/{slug}/session-{N}"
 WORKTREE_PATH="$WORKTREE_DIR/session-{N}"
 GIT_OPTIONAL_LOCKS=0 git worktree add -b "$BRANCH_NAME" "$WORKTREE_PATH" HEAD
 ```
@@ -717,8 +717,8 @@ branch survives even if cleanup races ahead (research/02 R3 — converts an
 unrecoverable failure to a recoverable one). Push failure is non-fatal
 (no remote, offline, etc.):
 ```bash
-GIT_OPTIONAL_LOCKS=0 git push origin "ultraplan/{slug}/session-{N}" 2>/dev/null || true
-GIT_OPTIONAL_LOCKS=0 git merge --no-ff "ultraplan/{slug}/session-{N}" \
+GIT_OPTIONAL_LOCKS=0 git push origin "trek/{slug}/session-{N}" 2>/dev/null || true
+GIT_OPTIONAL_LOCKS=0 git merge --no-ff "trek/{slug}/session-{N}" \
   -m "merge: ultraplan session {N} — {session-title}"
 ```
 
@@ -748,7 +748,7 @@ After successful merge of all sessions in the wave:
 ```bash
 for each session N in the wave:
   GIT_OPTIONAL_LOCKS=0 git worktree remove "$WORKTREE_DIR/session-{N}" --force
-  GIT_OPTIONAL_LOCKS=0 git branch -d "ultraplan/{slug}/session-{N}"
+  GIT_OPTIONAL_LOCKS=0 git branch -d "trek/{slug}/session-{N}"
 done
 GIT_OPTIONAL_LOCKS=0 git worktree prune
 ```
@@ -777,7 +777,7 @@ done
 GIT_OPTIONAL_LOCKS=0 git worktree prune
 
 # Remove session branches
-GIT_OPTIONAL_LOCKS=0 git branch --list "ultraplan/{slug}/*" | while read branch; do
+GIT_OPTIONAL_LOCKS=0 git branch --list "trek/{slug}/*" | while read branch; do
   GIT_OPTIONAL_LOCKS=0 git branch -D "$branch" 2>/dev/null
 done
 

plugins/ultraplan-local/templates/headless-launch-template.md

@@ -56,14 +56,14 @@ cleanup_worktrees() {
   cd "$REPO_ROOT"
   # push-before-cleanup (Hard Rule 19): push any remaining branches so work
   # survives even if subsequent removal races. Failure is non-fatal.
-  git branch --list "ultraplan/{slug}/*" | while read b; do
+  git branch --list "trek/{slug}/*" | while read b; do
     git push origin "$b" 2>/dev/null || true
   done
   for wt in "$WORKTREE_BASE"/session-*; do
     [ -d "$wt" ] && git worktree remove "$wt" --force 2>/dev/null && echo "Removed: $wt"
   done
   git worktree prune
-  git branch --list "ultraplan/{slug}/*" | while read b; do
+  git branch --list "trek/{slug}/*" | while read b; do
     git branch -D "$b" 2>/dev/null
   done
   rmdir "$WORKTREE_BASE" 2>/dev/null
@@ -109,8 +109,8 @@ echo ""
 echo "--- Wave {N}: {description} ---"
 
 {# For each parallel session in this wave, create worktree: }
-git worktree add -b "ultraplan/{slug}/session-{n}" "$WORKTREE_BASE/session-{n}" HEAD
-echo "Worktree created: session-{n} (branch: ultraplan/{slug}/session-{n})"
+git worktree add -b "trek/{slug}/session-{n}" "$WORKTREE_BASE/session-{n}" HEAD
+echo "Worktree created: session-{n} (branch: trek/{slug}/session-{n})"
 
 {# Launch session in its worktree (with safety preamble + budget caps + shared context): }
 cd "$WORKTREE_BASE/session-{n}" && claude -p "${SAFETY_PREAMBLE}
@@ -136,8 +136,8 @@ echo ""
 echo "--- Merging Wave {N} ---"
 cd "$REPO_ROOT"
 {# For each session in the wave: push BEFORE merge (Hard Rule 19 — push-before-cleanup). }
-git push origin "ultraplan/{slug}/session-{n}" 2>/dev/null || true
-git merge --no-ff "ultraplan/{slug}/session-{n}" \
+git push origin "trek/{slug}/session-{n}" 2>/dev/null || true
+git merge --no-ff "trek/{slug}/session-{n}" \
   -m "merge: ultraplan session {n} — {title}"
 if [ $? -ne 0 ]; then
   echo "MERGE CONFLICT: session {n}. Conflicting files:"
@@ -147,7 +147,7 @@ if [ $? -ne 0 ]; then
   exit 1
 fi
 git worktree remove "$WORKTREE_BASE/session-{n}" --force
-git branch -d "ultraplan/{slug}/session-{n}"
+git branch -d "trek/{slug}/session-{n}"
 echo "Merged and cleaned: session {n}"
 
 git worktree prune