fix(git): correct three command claims the plugin got wrong, and give rebase an owner

Three statements were false against the git in use (2.39.5), each verified by
running it.

`git rebase --autosquash HEAD~N` without `-i` is a silent no-op: git prints
"Successfully rebased", the `fixup!` commit survives with the same SHA, and
rewrite-history.md presented that as the preferred flow with `-i` as an optional
review step. The agent reports the squash as done and the `fixup!` subject then
trips this repo's own commit-msg gate. `-i` is now the command, not the alternative.

"Fetch never modifies a local branch, so it is always safe to run" — new text on
this branch — is false: `git fetch origin main:probe` fast-forwarded the local
branch, and a `+` prefix force-updates it, losing commits. The claim is scoped to
the no-refspec form.

`git worktree add --orphan` does not exist before Git 2.42; on 2.39.5 it is
`error: unknown option 'orphan'`, exit 129. The same file gives a version floor for
`--recurse-submodules` three sections earlier. Floor added, with a fallback that
was tested before being documented.

git-workflow claimed "every request resolves to exactly one of these six" while
rebase, reset and stash were owned by no skill — `git reset` appeared nowhere in
the plugin, old tree or new — so "undo my last commit" routed nowhere. The claim is
gone, the router gains rows for all three, and the procedures now exist: plain
rebase with `--onto` and conflict handling, a reset mode table gated on `--hard`,
and stash save/pop/list/drop. `--hard` gets an always-loaded Gotcha, matching the
register the force-push refusal already sets.

Cherry-pick had three claimants pointing at git-history while git-commits owned the
flow, and the two copies were not equivalent — git-history's lacked the destination
check, the rtk prefix and `--abort`. Resolved to git-commits per #112; the weaker
duplicate is replaced by a hand-off.

git-commits' metadata.version was deleted rather than bumped in 14af50b, leaving two
house-contract documents citing a worked v0.1.2 to v0.1.3 transition against a file
declaring no version. Restored to 0.1.3.

Also: the divergent-pull explanation stated a `--ff-only` default that does not
exist (it is a hard error); `--remote` "requires" a configured branch where it uses
one; `git push origin --delete` moved to git-remotes, which owns the remote-side
gates; seven retired `git:<name>` source slugs; git-orchestrate quoted a
git-workflow sentence that no longer exists; git-submodules regains the indirect
trigger that made "add a dependency repo" routable; and commit atomicity is a common
gate rather than reachable only from the create flow.

Refs: #112, #113

plugins/git/.apm/skills/git-branches/references/branch-operations.md

@@ -15,7 +15,9 @@ hatch.
 - **delete (local)** — `git branch -d <branch>` refuses when the branch holds unmerged commits,
   which is why it is the default. `git branch -D <branch>` forces the deletion and discards that
   work — only after the destructive-operation gates pass and `confirm: true` is set.
-- **delete (remote)** — `git push origin --delete <branch>`.
+- **delete (remote)** — not this skill's. Deleting a remote branch is a push, and every remote-side
+  gate lives in `git-remotes`; hand it there rather than running the push from here. Its
+  `references/push.md` carries the command and the refspec form.
 - **rename** — `git branch -m <old> <new>`.
 - **list** — `git branch` (local), `-a` (local plus remote-tracking), `-r` (remote-tracking only),
   `--merged` / `--no-merged` (filter by merge status into the current branch).
@@ -32,3 +34,23 @@ On `get-intent`, either parse the intent back out of the branch-name convention
 (`feature/<intent-slug>`) or return `{ "intent": null }` when the caller never persisted the
 create-time value. Never fabricate an intent: a downstream commit message built on a guessed
 intent is worse than one built on none.
+
+## Stashing work in progress
+
+A switch aborts rather than clobbering conflicting local changes (see Gotchas). Stash is the way
+past it: it shelves the working tree and index so the branch pointer can move.
+
+- **save** — `git stash push -m "<message>"`. Add `-u` to include untracked files; verified on Git
+  2.39.5, a plain `push` leaves them in place, and a plain `push` with *only* untracked changes
+  reports `No local changes to save` and stashes nothing. Bare `git stash` is `push` with no message.
+- **restore** — `git stash pop` applies the newest entry and deletes it. `git stash apply stash@{n}`
+  applies without deleting, for replaying one shelf onto more than one branch.
+- **list** — `git stash list`; `git stash show -p stash@{n}` prints that entry's diff.
+- **drop** — `git stash drop stash@{n}` deletes one entry. `git stash clear` deletes all of them
+  and nothing recovers them — confirm before running it.
+- **branch from a stash** — `git stash branch <branch> stash@{n}` creates a branch at the commit the
+  stash was taken from and pops it there. Use it when the stash no longer applies to the current tip.
+
+**A conflicting `pop` keeps the entry.** Verified on 2.39.5: it exits 1, writes conflict markers,
+prints "The stash entry is kept in case you need it again", and `git stash list` still shows it.
+Resolve, `git add`, then `git stash drop` the entry by hand — otherwise it silently accumulates.

plugins/git/.apm/skills/git-branches/references/merging.md

@@ -6,8 +6,8 @@ source_keys:
 
 # Merging one branch into another
 
-Scope is fast-forward and merge-commit mechanics plus conflict resolution. Rebase belongs to
-`git-commits`; cherry-pick and revert to `git-history`.
+Scope is fast-forward and merge-commit mechanics plus conflict resolution. Rebase and cherry-pick
+belong to `git-commits`; revert to `git-history`.
 
 - **Fast-forward** — `git merge <branch>` advances the pointer with no merge commit when the
   target has not diverged.