chore: prune stale branches, worktrees, and dangling references

[mkobit]

Summary

Dedicated pruning pass across three areas, per request. Each branch/worktree/remote
deletion below was verified against the actual merged PR record (not raw git log
reachability, which false-negatives on squash merges) plus content diffs before deletion —
none were guessed from names or dates alone.

1. Local branches and worktrees (already executed, no diff here)

Deleted 56 local branches and removed 3 worktrees (chezmoi-fix-tmux-url-popup,
chezmoi-fix-zellij-term, chezmoi-gemini-bump). Every branch was confirmed merged, or
closed-but-superseded by different work that did merge:

• fix-tmux-url-popup-... — PR feat(tmux): add hotkey to extract and open URLs using fzf #395 closed unmerged; the tmux URL-open feature was
  reimplemented as termbud tmux open-url (merged via feat(tmux): refactor python module into termbud with typer #421/feat(termbud): add zellij open-url subcommand #433/⚡ [performance] Move re.compile to module level in tmux.py #504).
• fix/zellij-term-and-tests — PR fix(zellij): use tmux-256color for tmux and leave TERM for zellij #415 merged; confirmed byte-identical content, worktree's
  one uncommitted change was a local uv.lock regen artifact, not real work.
• jules-14732888419114859918-fdd80705 — PR refactor(jules-cli): split main.py into domain specific files #594 closed; re-landed and merged 8 minutes
  later as PR fix(jules-cli): move get_api_key to config.py to avoid circular/inline imports #621 (same file set).
• jules-5367206502345479309-8ec6b406 — PR feat: Add deterministic Windows font management via Chezmoi #386 closed; used the flat .chezmoiexternal.toml.tmpl
  form this repo's AGENTS.md explicitly disallows; superseded by the properly merged feat(wsl): deterministic Windows font and terminal font setup #442.
• Remaining 52 branches: all confirmed merged via PR record (the initial gh pr list sweep
  only covered the most recent 300 of 704 total PRs, which produced false "no PR" negatives
  for anything merged before Refactor tmux config to use chezmoitemplates #408 — re-ran against the full history to confirm).

2. Remote branches (already executed, no diff here)

Deleted 10 remote stragglers GitHub didn't auto-clean (8 map to closed/merged PRs, one
Bazel-era revert, and review-593-fixup — a manual review branch with real but abandoned
termbud scrollback-extraction work from a closed PR, confirmed abandoned and approved for
deletion).

3. Dangling references (this diff)

• docs/HANDOFF-sandboxr-runtime-decision.md — deleted outright. It was a session-handoff
  artifact from PR sandboxr: srt-primary sandbox runtime (design, decision, backend) #695 ("Audience: fresh agent session executing follow-ups"), not curated
  documentation; every follow-up it listed is now resolved (feat(sandboxr): add opt-in --timeout to bound sandboxed invocations #706/fix(sandboxr): close unrestricted-egress gap on the default autonomous profile #707/fix(sandboxr): validate CLI overrides and re-expose agent sockets under srt #708/chore(sandboxr): delete the seatbelt.py macOS stub #709) and its
  decision rationale is already duplicated in memory. Repointed the two comment references
  that cited it (sandbox.toml, bin/mise.toml) at PR sandboxr: srt-primary sandbox runtime (design, decision, backend) #695 instead.
• src/chezmoi/dot_config/mise/AGENTS.md — documented a script name and MISE_LOCKED
  value that drifted after chore(mise): transition to pinned global versions and relax locking #574 relaxed locking; also a stale .mise.toml filename
  (repo root file is mise.toml, no leading dot).
• docs/DESIGN-keybindings.md — managed-files table had stale paths for the zellij config,
  Ghostty conf.d/ files, and VS Code/Cursor keybindings (referenced a modify_ prefix
  that was never shipped).

4. Retired catalog/BOM entries (this diff)

Deleted the claude_statusline and agent_run tombstone entries (BOM +
local_bin_tools.toml) — both were retired via rename (→ termstatus, → sandboxr)
over 2 weeks ago; confirmed applied on all machines.

Test plan

• chezmoi execute-template --init renders the BOM template cleanly with no leftover
  references to the deleted keys
• uv run pytest tests/integration/test_local_bin_tools.py tests/integration/test_chezmoi_data.py
  — same 4 pre-existing failures with and without this diff (local dev-venv PATH
  shadowing, unrelated to this change)
• git branch -a / git worktree list confirm a clean final state
• rg -l "HANDOFF-sandboxr-runtime-decision" confirms zero remaining references after
  deletion

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