feat(freeze): add scheduled freeze CLI commands

[jd]

Add mergify freeze command group with list, create, update, and delete
subcommands for managing scheduled merge freezes. Supports both Mergify
application keys and GitHub tokens for authentication, auto-detects
repository from git remote, and provides both table and JSON output.

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

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Pull request overview

Adds a new mergify freeze command group to manage scheduled merge freezes via the Mergify API, along with a dedicated API wrapper and CLI tests.

Changes:

• Introduces freeze CLI group with list, create, update, and delete subcommands, including table/JSON output.
• Adds mergify_cli.freeze.api client functions for the scheduled freeze endpoints.
• Adds a comprehensive respx-based CLI test suite for the new command group.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
mergify_cli/freeze/cli.py	Implements the freeze click command group, formatting/output, and default token/repo detection.
mergify_cli/freeze/api.py	Adds async API calls for list/create/update/delete scheduled freezes.
mergify_cli/cli.py	Registers the new freeze command group in the top-level CLI.
mergify_cli/tests/freeze/test_cli.py	Adds CLI tests covering list/create/update/delete flows and error paths.
mergify_cli/tests/freeze/__init__.py	Adds package marker for freeze tests.
mergify_cli/freeze/__init__.py	Adds package marker for freeze module.

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[JulianMaurin]

No error handling on API responses

The API functions (list_freezes, create_freeze, etc.) call .json() on responses without checking status codes first. The check_for_status event hook on the HTTP client will raise on 4xx/5xx, but only after
aread() — if the hook fails to trigger or the client is used differently, you'd get silent failures. This is consistent with the existing codebase pattern though, so it's acceptable.

[jd]

Acknowledged — this follows the existing codebase pattern where check_for_status on the HTTP client event hook handles error responses.

[JulianMaurin]

Users shouldn't need to re-specify every field just to change the end time ?

[jd]

Agreed this would be a better UX. The update API currently requires all fields (it's a full replacement, not a partial patch). We should change the API to support partial updates first, then update the CLI to match.

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Pull request overview

Copilot reviewed 6 out of 8 changed files in this pull request and generated 5 comments.

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