Add Ori as a lazy-loaded agent and a default-agent choice (#7709)

Ori is OpenRouter's harness: `ori claude`, `ori codex` and `ori opencode` start those agents against OpenRouter's model catalogue, and `ori code` is Ori's own agent. That last one is what the default-agent entry launches, bare — Ori has no approval prompt to skip, so there is no "don't stop to ask" flag to pass it the way the other agents get one.

The package is `github:OpenRouterLabs/ori-releases`, because upstream ships prebuilt binaries as release assets and publishes nothing to npm. mise's `github` backend picks the right asset per platform and verifies GitHub's artifact attestations on the way in; `ubi` resolves the same release but is deprecated for removal in mise 2027.1.

The menu glyph at U+E909 is OpenRouter's own mark. Ori publishes no logo of its own and its product page renders that one, so there was no Ori-specific mark to prefer over it.

Co-authored-by: Codex XHigh <noreply@openai.com>

test/shell.d/menu-test.sh

@@ -220,6 +220,7 @@ const expectedAgents = {
   pi: { icon: '\ue901', iconFont: 'omarchy', label: 'Pi' },
   omp: { icon: '\ue903', iconFont: 'omarchy', label: 'omp' },
   opencode: { icon: '\ue902', iconFont: 'omarchy', label: 'OpenCode' },
+  ori: { icon: '\ue909', iconFont: 'omarchy', label: 'Ori' },
   claude: { icon: '󰛄', label: 'Claude' },
   codex: { icon: '\ue905', iconFont: 'omarchy', label: 'Codex' },
   grok: { icon: '\ue904', iconFont: 'omarchy', label: 'Grok' },
@@ -243,7 +244,7 @@ assertDeepEqual(
   defaultItems
     .filter(item => item.parent === 'setup.default.agent')
     .map(item => item.label),
-  ['Antigravity', 'Claude', 'Codex', 'Copilot', 'Crush', 'Grok', 'omp', 'OpenCode', 'Pi'],
+  ['Antigravity', 'Claude', 'Codex', 'Copilot', 'Crush', 'Grok', 'omp', 'OpenCode', 'Ori', 'Pi'],
   'menu sorts coding agents alphabetically'
 )
 const expectedDefaults = {
@@ -635,5 +636,5 @@ assert(
 JS
 
 font_charset=$(fc-query --format='%{charset}' "$ROOT/default/fonts/omarchy/omarchy.ttf")
-[[ $font_charset == *"e900-e908"* ]] || fail "Omarchy icon font includes every custom menu glyph"
+[[ $font_charset == *"e900-e909"* ]] || fail "Omarchy icon font includes every custom menu glyph"
 pass "Omarchy icon font includes the official agent marks"