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/.apm/skills/git-commits/SKILL.md

@@ -57,8 +57,17 @@ For an agent caller, return:
   "semver_impact": "MAJOR|MINOR|PATCH|none",
   "breaking_change": false,
   "confirmation_required": false,
-  "details": { "type": "feat", "scope": "api", "description": "add user authentication" }
+  "details": {
+    "type": "feat",
+    "scope": "api",
+    "description": "add user authentication",
+    "body": "optional body text, or null",
+    "footers": ["Fixes: #123", "Refs: #456", "Co-authored-by: Bob <bob@example.com>"]
+  }
 }
 ```
 
+`details.footers` is an array of the resolved trailer lines, empty when there are none — never a
+single joined string, and never omitted. Downstream agents index it.
+
 For a human caller, show the same fields as a prose preview with a confirmation prompt.