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/pc-run/SKILL.md

@@ -47,6 +47,9 @@ Determine intent from the user's request, then execute the matching operation. W
 | "clean", "wipe cache", "rebuild from scratch" | `pre-commit clean` — read `references/clean.md` |
 | "hooks aren't running", "hook never fires", "why did a hook fail", a hook failure whose cause is unclear | Diagnose — read `references/failure-patterns.md` |
 
+If the intent is ambiguous, default to `pre-commit run --all-files` — do not stop to ask, and do
+not fall through to a narrower row on a guess.
+
 ## Run
 
 Default to `pre-commit run --all-files`; never silently narrow to staged files. Run `pre-commit run` (staged only) or `pre-commit run <hook-id>` (one named hook) when the user asks for it.