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This change keeps unified @mentions behind the mentions_v2 gate, moves the flag to under-development, and polishes mention rendering/history behavior. It also adds a few small improvements to the mentions feature around mention rendering and history round-tripping for plugin/tool mentions in message edit scenarios. Plugin selections now insert `@` mentions with better casing, and saved history preserves the visible sigil so recalled messages look the same as what the user typed. - Preserves `@` sigils when encoding/decoding mention history for tool/plugin paths. - Improves plugin mention insertion so display names/casing are reflected more cleanly in the composer. - Update composer to render user-entered plugin mentions in the same color as the mentions menu. ALso applies to recalled/edited messages. - Left/right arrows no longer switch unified-mention search modes after an @mention has already been accepted (Ex: arrowing left through a composed message that contains @mentions). - Keeps bound mentions stable around punctuation, so accepted `@` mentions do not reopen the popup and punctuated `$` mentions still persist to cross-session history. **Steps to test** - Ensure mentions_v2 is enabled through configuration or `--enable mentions_v2` - Type `@` in the TUI composer and verify filesystem/plugin/skill results are displayed in the unified mentions menu. - Select a plugin mention from the `@` popup and confirm the inserted text is an `@...` mention with casing, then recall/edit the message and confirm it still renders as `@...`. - Mention a skill and verify that skills still insert as `$skill` mentions rather than `@` mentions. - Verify punctuated mentions such as `@plugin.` and `($skill)` keep their bound mention behavior across editing and history recall.
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