refactor(file): add ripgrep search service (#22295)

packages/opencode/specs/effect/routes.md

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+# Route handler effectification
+
+Practical reference for converting server route handlers in `packages/opencode` to a single `AppRuntime.runPromise(Effect.gen(...))` body.
+
+## Goal
+
+Route handlers should wrap their entire body in a single `AppRuntime.runPromise(Effect.gen(...))` call, yielding services from context rather than calling facades one-by-one.
+
+This eliminates multiple `runPromise` round-trips and lets handlers compose naturally.
+
+```ts
+// Before - one facade call per service
+;async (c) => {
+  await SessionRunState.assertNotBusy(id)
+  await Session.removeMessage({ sessionID: id, messageID })
+  return c.json(true)
+}
+
+// After - one Effect.gen, yield services from context
+;async (c) => {
+  await AppRuntime.runPromise(
+    Effect.gen(function* () {
+      const state = yield* SessionRunState.Service
+      const session = yield* Session.Service
+      yield* state.assertNotBusy(id)
+      yield* session.removeMessage({ sessionID: id, messageID })
+    }),
+  )
+  return c.json(true)
+}
+```
+
+## Rules
+
+- Wrap the whole handler body in one `AppRuntime.runPromise(Effect.gen(...))` call when the handler is service-heavy.
+- Yield services from context instead of calling async facades repeatedly.
+- When independent service calls can run in parallel, use `Effect.all(..., { concurrency: "unbounded" })`.
+- Prefer one composed Effect body over multiple separate `runPromise(...)` calls in the same handler.
+
+## Current route files
+
+Current instance route files live under `src/server/instance`, not `server/routes`.
+
+The main migration targets are:
+
+- [ ] `server/instance/session.ts` — heaviest; still has many direct facade calls for Session, SessionPrompt, SessionRevert, SessionCompaction, SessionShare, SessionSummary, Agent, Bus
+- [ ] `server/instance/global.ts` — still has direct facade calls for Config and instance lifecycle actions
+- [ ] `server/instance/provider.ts` — still has direct facade calls for Config and Provider
+- [ ] `server/instance/question.ts` — partially converted; still worth tracking here until it consistently uses the composed style
+- [ ] `server/instance/pty.ts` — still calls Pty facades directly
+- [ ] `server/instance/experimental.ts` — mixed state; some handlers are already composed, others still use facades
+
+Additional route files that still participate in the migration:
+
+- [ ] `server/instance/index.ts` — Vcs, Agent, Skill, LSP, Format
+- [ ] `server/instance/file.ts` — Ripgrep, File, LSP
+- [ ] `server/instance/mcp.ts` — MCP facade-heavy
+- [ ] `server/instance/permission.ts` — Permission
+- [ ] `server/instance/workspace.ts` — Workspace
+- [ ] `server/instance/tui.ts` — Bus and Session
+- [ ] `server/instance/middleware.ts` — Session and Workspace lookups
+
+## Notes
+
+- Some handlers already use `AppRuntime.runPromise(Effect.gen(...))` in isolated places. Keep pushing those files toward one consistent style.
+- Route conversion is closely tied to facade removal. As services lose `makeRuntime`-backed async exports, route handlers should switch to yielding the service directly.