fix(git): restore router coverage and commands the retrofit dropped

git-workflow calls itself a router but named two of the six domains it routes to;
the other four appeared nowhere in the file. All six are now named, with a
routing table in the always-loaded body.

git-submodules lost the foreach shell-variable semantics -- only the bare names
survived, though $sm_path and $displaypath differ solely by which directory you
are in. The table is back. Its relocated commands had also dropped the rtk git
prefix its own SKILL.md mandates; 24 of them are re-prefixed. The wider rtk
inconsistency across the plugin stays with #113.

Also restores git-commits' body and footers output fields, git-branches' tag/
branch detection commands, git-worktrees' git config --worktree, pc-run's
ambiguity fallback, git-remotes' git-history boundary, and git-history's pickaxe
triggers.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EJJrm5YmacbwMdzZpXcoti

plugins/git/skills/git-worktrees/SKILL.md

@@ -18,7 +18,7 @@ metadata:
 - **A branch can be checked out in only one worktree at a time.** `git worktree add` on an already-checked-out branch fails; `--force` is the only override, so use it only deliberately.
 - **Never `rm -rf` a worktree directory.** That strands metadata in `$GIT_DIR/worktrees/`. Use `git worktree remove`, or `git worktree prune` afterwards.
 - **Submodules break worktree support.** A worktree containing submodules cannot be moved at all, and needs `--force` to remove.
-- **`extensions.worktreeConfig = true` is a one-way door.** It costs compatibility with older Git and forces `core.bare`/`core.worktree` into `config.worktree`. Leave it off unless per-worktree config is needed.
+- **`extensions.worktreeConfig = true` is a one-way door.** Without it, `git config --worktree` errors; with it, that flag writes to the worktree's own `config.worktree` file, and `core.bare`/`core.worktree` are forced there too. It also breaks older Git. Leave it off unless per-worktree config is needed.
 
 ## Step 1 — Dispatch