Add commit current changes workflow

[tninja]

Summary

Add a Commit current changes action under C-c a v.

The workflow:

• prompts for a commit message
• stages the current working tree with git add -A
• when the message is empty, generates one from the exact staged diff and lets the user edit it
• commits the staged change
• asks whether to push to the remote
• uses the existing upstream when available, otherwise sets one with git push -u

The implementation is kept in a small lazy-loaded ai-code-commit.el module so the existing GitHub/PR workflow remains unchanged apart from the new action.

Tests

Added ERT coverage for explicit messages, AI-generated messages, push behavior, and C-c a v dispatch.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid truncating the staged diff before message generation

When the staged diff makes this prompt exceed 1,000 characters, ai-code-call-gptel-sync truncates the entire question according to the default ai-code-gptel-sync-max-length, so the model usually receives only the beginning of a nontrivial diff. This contradicts the workflow's promise to generate from the exact staged diff and can produce a misleading commit message that omits the main changes; this call needs to bypass or explicitly raise that limit for commit generation.

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