Plugin Stuff Round 9

[lbedner]

No description provided.

[Copilot]

Pull request overview

Adds end-to-end CLI + ManualUpdater support for installing/removing external plugins, including reverse-dependency checks and test fixtures to validate plugin template distribution and answers-file updates.

Changes:

• Introduces aegis add <plugin> / aegis remove <plugin> dispatch paths backed by ManualUpdater.add_plugin() / ManualUpdater.remove_plugin().
• Adds reverse_dependents() in aegis.core.plugin_compat plus unit tests to validate reverse-dependency detection.
• Adds an in-repo fake plugin fixture (tests/fixtures/aegis_plugin_test) and expands ManualUpdater plugin tests for add/remove round-trips.

Reviewed changes

Copilot reviewed 9 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
aegis/commands/add.py	Adds plugin resolution + install flow and dispatch to add-service for services.
aegis/commands/remove.py	Adds plugin resolution + uninstall flow and reverse-dependency checks before removal.
aegis/core/manual_updater.py	Implements add_plugin() and remove_plugin() orchestration around answers updates, shared regen, template install/cleanup, and post-gen tasks.
aegis/core/plugin_compat.py	Adds _plugins parsing improvements and new reverse_dependents() helper.
aegis/i18n/locales/en.py	Adds English strings for plugin add/remove prompts/status messages.
tests/core/test_manual_updater_plugins.py	Adds end-to-end add/remove plugin round-trip tests and idempotency coverage.
tests/core/test_plugin_compat.py	Adds unit tests for reverse_dependents() across services/plugins/components deps.
tests/fixtures/aegis_plugin_test/... (all added files)	Fake plugin distribution fixture (spec + templates + packaging metadata) used by tests.