Replace Gemini coding agent with Antigravity (#6900)

* Replace Gemini coding agent with Antigravity

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Remove the dead Gemini mise wrapper in the Antigravity migration

Remove Preinstalls no longer lists gemini, so the wrapper Omarchy created
would have stayed in ~/.local/bin with nothing left to clean it up.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* Install Antigravity when it is the default a Gemini user is migrated onto

The opt-out check skipped the install but the rewrite ran anyway, so anyone
who had removed the preinstalls was left with a default agent naming a
command that is not there.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* Fix Antigravity skill provisioning and Gemini wrapper migration

- Wires Omarchy's default skills into Antigravity by linking them to ~/.gemini/config/skills/ in bin/omarchy-provision-user and migrations/1786719479.sh.
- Fixes the Gemini wrapper migration in migrations/1786719479.sh to recognize and remove wrappers containing either `mise use -g "gemini"` or `mise use -g --quiet "gemini"`, while leaving hand-written wrappers intact.
- Adds regression tests for both skill provisioning and wrapper removal in test/shell.d/default-agent-test.sh and test/shell.d/provision-user-test.sh.

* Stop the provisioning test from retheming the session it runs in

The test ran the real omarchy-provision-user, which sources install/user/all.sh and so reached omarchy-theme-set: hyprctl reload against the live compositor, gsettings against the live desktop, and a global Node install, none of which the skill symlinks it asserts need. Its mocks for omarchy-done and omarchy-refresh-applications were shadowed anyway, because provisioning prepends $OMARCHY_PATH/bin ahead of them, so stubbing the install suite at its own path is what a mock cannot do here. The exit status is checked rather than discarded: the assertion held even when provisioning died outright, because the symlinks are made twenty lines before the suite runs.

* Match the Gemini default and wrapper the way Omarchy writes them

The migration decided both questions differently from the code that owns them. It read the default agent with grep -qxF, while omarchy-default-agent takes the first line through read, so a padded "  gemini  " that the launcher still resolves was left naming an agent the launcher no longer supports. The wrapper it deletes was matched anywhere in the file, so a hand-written one that only mentions the installer's line in a comment went with Omarchy's own. Reading it the launcher's way and anchoring the match settles both against whoever wrote the file. The skills loop guards its glob the way migrations/1786539345.sh does, so an empty source cannot leave a symlink named "*" behind a migration already marked complete.

Co-Authored-By: Codex XHigh <noreply@anthropic.com>

* List Antigravity among the skill directories

The manual named Claude Code, Codex, Pi and the generic location; provisioning now links ~/.gemini/config/skills too.

Co-Authored-By: Codex XHigh <noreply@anthropic.com>

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: David Heinemeier Hansson <david@hey.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: Omabot <omabot@omarchy.org>

test/shell.d/menu-test.sh

@@ -211,13 +211,13 @@ assertEqual(
   'menu lists Reset Computer last under Setup'
 )
 const expectedAgents = {
+  agy: { icon: '󰫢', label: 'Antigravity' },
   pi: { icon: '\ue901', iconFont: 'omarchy', label: 'Pi' },
   omp: { icon: '\ue903', iconFont: 'omarchy', label: 'omp' },
   opencode: { icon: '\ue902', iconFont: 'omarchy', label: 'OpenCode' },
   claude: { icon: '󰛄', label: 'Claude' },
   codex: { icon: '\ue905', iconFont: 'omarchy', label: 'Codex' },
   grok: { icon: '\ue904', iconFont: 'omarchy', label: 'Grok' },
-  gemini: { icon: '󰫢', label: 'Gemini' },
   copilot: { icon: '', label: 'Copilot' },
   crush: { icon: '󰋑', label: 'Crush' },
 }
@@ -238,7 +238,7 @@ assertDeepEqual(
   defaultItems
     .filter(item => item.parent === 'setup.default.agent')
     .map(item => item.label),
-  ['Claude', 'Codex', 'Copilot', 'Crush', 'Gemini', 'Grok', 'omp', 'OpenCode', 'Pi'],
+  ['Antigravity', 'Claude', 'Codex', 'Copilot', 'Crush', 'Grok', 'omp', 'OpenCode', 'Pi'],
   'menu sorts coding agents alphabetically'
 )
 const expectedDefaults = {