refactor(git-remotes): retrofit to the ADR-0020 context contract

Description 582 -> 237 chars, body 1217 -> 290 words. The single remotes.md
splits into config, fetch, push, and pull flow files.

Restores the confirm: true token to the force-push gate -- it is the git
plugin's cross-skill contract, gated on by git-orchestrate and git-branches.
Moves push.md's worked example off main, which the skill's own Step 1
refuses, and restores the never-bare---force directive.

plugins/git/skills/git-remotes/README.md

@@ -18,7 +18,17 @@ Describe your remote operation: add a remote, push, pull, fetch, or configure tr
 
 | File | Purpose |
 |------|---------|
-| `SKILL.md` | Skill instructions for agents |
+| `SKILL.md` | Skill instructions for agents — force-push gate, dispatch table, return format |
 | `references/README.md` | Describes the references directory contents |
-| `references/remotes.md` | Full `set-url` variants, shallow-clone/fetch options, force-push mitigation detail, and pull config precedence |
+| `references/remote-config.md` | Read when adding, removing, renaming, inspecting or re-pointing a remote, or configuring tracking, mirroring, or `set-url` |
+| `references/fetch.md` | Read when fetching or pruning remote-tracking refs, or doing a shallow or partial fetch |
+| `references/push.md` | Read when pushing branches or tags, writing refspecs, or force-pushing |
+| `references/pull.md` | Read when integrating remote changes into the current branch, including the divergence rule |
 | `references/sources.md` | Research sources and provenance |
+
+## Composition
+
+Callers that need submodule initialization after a `--recurse-submodules` pull hand off to
+`git-submodules`; local-only work (commits, branches, history) belongs to `git-commits`,
+`git-branches`, and `git-history`. The `git-workflow` skill routes humans here for any
+remote-touching request.