Chore: Remove migration templates

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[Copilot]

Pull request overview

This PR removes version-specific migration template snapshots and refactors the migration pipeline to rely on inline defaults inside migration code plus the current templates/configs directory.

Changes:

• Deleted templates/migration/* config snapshots and stopped bundling them in build scripts.
• Updated migration APIs (migrate_settings/defaults/wingman) to accept only the old config and inline any needed defaults.
• Reworked config bootstrapping during multi-step migrations to build new-version directories from the user’s prior configs plus current templates, and added a helper to stamp created_with_version on copied Wingman YAMLs.

Reviewed changes

Copilot reviewed 75 out of 103 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
templates/migration/**	Removes frozen migration template snapshots across many versions.
templates/configs/**	Removes created_with_version from shipped Wingman templates; relies on runtime stamping instead.
services/migrations/base_migration.py	Simplifies migration method signatures (no “new template” arg) and updates no-op helper.
services/migrations/migration_170_to_180.py	Inlines new default structures instead of pulling from templates; signature update.
services/migrations/migration_181_to_182.py	Inlines ElevenLabs prompt + new provider defaults; signature update.
services/migrations/migration_200_to_210.py	Inlines new settings/defaults; signature update.
services/migrations/migration_210_to_211.py	Removes template-derived “new model” lookup; uses fallback constants; signature update.
services/migrations/migration_211_to_300.py	Inlines new llama/parakeet defaults; signature update.
services/migrations/migration_300_to_301.py	Signature update (settings migration only needs old).
services/migrations/migration_310_to_311.py	Signature update (settings/defaults only need old).
services/migrations/README.md	Updates migration chain and docs to match the new approach (no migration templates; inline defaults).
services/config_migration_service.py	Removes dependency on templates/migration/**; bootstraps new version dirs from old configs + current templates; adjusts callback signatures.
services/config_manager.py	Adds _stamp_created_with_version() helper and stamps copied Wingman YAMLs created from templates.
build.py / build_macos.py	Stops packaging templates/migration/** into builds.

Comments suppressed due to low confidence (1)

services/config_migration_service.py:900

• migrate_settings(...) results are not written to new_file for intermediate migration steps (only save_settings_config() is called, which writes to the current versioned config dir). This breaks multi-step migrations because the next migration reads settings from the intermediate version directory. Mirror the defaults.yaml handling: when new_config_path != self.latest_config_path, write migrated_settings to new_file without Pydantic validation; keep the current validated save path for the final step.

                elif filename == "settings.yaml":
                    self.log_highlight("Migrating settings.yaml...")
                    migrated_settings = migrate_settings(
                        old=self.config_manager.read_config(old_file),
                    )
                    try:
                        if new_config_path == self.latest_config_path:
                            self.config_manager.settings_config = SettingsConfig(
                                **migrated_settings
                            )
                        self.config_manager.save_settings_config()

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