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-submodules/references/README.md

@@ -10,8 +10,9 @@ One file per task branch in SKILL.md's dispatch table. Load only the one that ma
 ## setup-and-update.md
 
 Cloning a superproject that has submodules, adding a dependency as a submodule, initializing
-without cloning, and updating or re-pinning. Carries the `add` and `update` flag tables and the
-keep-pinned and move-the-pin-forward workflows.
+without cloning, updating or re-pinning, and running one command across every submodule. Carries
+the `add` and `update` flag tables, the keep-pinned and move-the-pin-forward workflows, and the
+`foreach` shell-variable table (`$name`, `$sm_path`, `$displaypath`, `$sha1`, `$toplevel`).
 
 ## urls-and-config.md