#36 Add commit split for staged multi-commit plans

Motivation

No motivation was provided.

What's New

Git Pathspecs

• listStagedPaths reads staged paths with git diff --staged --name-only -z.
• performCommit takes optional pathspecs so one staged set can become several commits.
• Commits run as git -C <worktree-root> so those root-relative paths work when cwd is a subdirectory.

Split Plan

• The model returns JSON commit groups. The parser rejects empty messages, empty file lists, duplicates, and unknown paths.
• Leftover staged paths are appended as Commit remaining staged changes.

CLI

• commit split proposes a plan, then apply, apply and push, edit, move, reorder, regenerate, or cancel.
• Apply walks the plan and commits each group with pathspecs.

Split Plan Flow

flowchart TB
    A["commit split"] --> B["Staged diff and paths"]
    B --> C["generateSplitPlan"]
    C --> D{"Action"}
    D -->|edit move reorder| D
    D -->|regenerate| C
    D -->|apply| E["performCommit per group"]
    D -->|apply and push| E
    E --> F["push publish or force-with-lease"]
    D -->|cancel| G["exit"]

Changed Files

File	Change Type	Summary
src/infra/git/repo.ts	Modified	Pathspecs, listStagedPaths, git -C root
src/domain/split/plan.ts	Added	Parse and validate plan JSON
src/cli/split.ts	Added	Interactive apply loop
src/domain/commit/prompts.ts	Modified	getSplitPrompt
src/domain/llm/router.ts	Modified	generateSplitPlan
src/cli/parser.ts	Modified	split command
src/domain/alias/alias.ts	Modified	Alias target split
index.ts	Modified	Dispatch split
README.md	Modified	Document commit split
tests listed above	Added/Modified	Plan, router, CLI apply/cancel, git pathspec

Testing & Feedback

Try commit split on a mixed staged set, including from a subdirectory. Confirm apply leaves the right files in each commit, leftover paths get the remaining-changes commit, and cancel writes nothing.

If you find any bugs or have recommendations for improvements, please open an issue and assign it to me.

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[!NOTE]
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