Description 480 -> 248 chars, body 1011 -> 347 words. The single
submodules.md splits into setup-and-update, urls-and-config, and removal.
Restores three regressions the first pass introduced: 'repointing' as the
trigger for the URL branch, which had none while the boundary clause
steered those queries to git-remotes; clone and absorbgitdirs in the output
enum, which dispatch still routed to; and status --cached, the flag that
makes the pre-commit pointer gate verifiable.
## Why
The git plugin only covered a partial slice of common git workflows.
This adds the remaining skill set (branches, commits, history, remotes,
submodules, workflow, worktrees) plus a git-orchestrate agent so the
plugin can handle end-to-end git automation instead of a handful of
commands.
## Implementation Notes
Each new skill was validated against its research docs and org
conventions after initial authoring, which surfaced hallucinated
version pins, factual errors, and completeness gaps that were
corrected in the same pass rather than left for follow-up.
## Impact
Bumps the git plugin to 1.3.0.
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
