feat: versioned actionable adoption specs with 5 host profiles

Redesign the assistant adoption spec system to be version-aware and
actionable for installers. Specs now answer both "what does this host
support?" and "where do I install things?"

Schema changes (assistant-adoption.schema.json):
- Add version-gated field pattern (semver range keys via patternProperties)
- Add component_paths (required) — per-scope install paths for all 7 types
- Add extension_model (bundle vs scatter) replacing plugin_model
- Add roadmap section for tracking in-progress host changes
- Restructure hook_events: execution_models as array (command/prompt/agent)
- Restructure mcp: remove config_location (now in component_paths)
- Restructure instructions: add paths for per-scope locations
- Remove plugin_model and adapter_interface sections

Rewrite all 5 host specs with verified data (Feb 2026):
- claude-code: 17 hook events, 3 execution models, correct MCP paths
- copilot-cli: fix cli_command, native skills/LSP, plugin system paths
- codex-cli: notify-only hooks, roadmap for PR #11067, TOML config
- gemini-cli: extension system, 11 hooks, sse+http-streaming transports
- opencode: TypeScript plugin hooks, 24+ LSP languages, JSONC config

Update page generator for new sections (component_paths, extension_model,
roadmap tables) and sync Astro site docs.

Author: zircote

astro.config.mjs

@@ -99,6 +99,17 @@ export default defineConfig({
             },
           ],
         },
+        {
+          label: "Assistants",
+          items: [
+            { label: "Overview", slug: "assistants" },
+            { label: "Claude Code", slug: "assistants/claude-code" },
+            { label: "Copilot CLI", slug: "assistants/copilot-cli" },
+            { label: "Codex CLI", slug: "assistants/codex-cli" },
+            { label: "Gemini CLI", slug: "assistants/gemini-cli" },
+            { label: "OpenCode", slug: "assistants/opencode" },
+          ],
+        },
         {
           label: "Design",
           items: [{ label: "Rationale", slug: "design/rationale" }],

package.json

@@ -7,7 +7,8 @@
     "build": "astro build",
     "preview": "astro preview",
     "generate:spec": "node scripts/generate-spec-pages.mjs",
-    "check:spec": "node scripts/check-spec-freshness.mjs"
+    "check:spec": "node scripts/check-spec-freshness.mjs",
+    "generate:assistants": "node scripts/generate-assistant-pages.mjs"
   },
   "dependencies": {
     "astro": "^5.17.2",