build: drop tsc entirely and fix sandbox-hostile tests

AGENTS.md

@@ -30,7 +30,7 @@ Single-context repo. Read `CONTEXT.md` for domain language and testing/architect
 - Decide docs/skills impact up front.
 
 ## Principles (expensive lessons — each cost an incident)
-- Guarantees erode at path boundaries. Any new dispatch path or fast path classifies its cells in `src/contracts/interaction-guarantees.ts` first; tsc forces completeness, you supply honesty. ADR 0011.
+- Guarantees erode at path boundaries. Any new dispatch path or fast path classifies its cells in `src/contracts/interaction-guarantees.ts` first; the typechecker forces completeness, you supply honesty. ADR 0011.
 - A registry claim is not a semantic check: never mark a cell `runner` without reading whether the Swift code implements the guarantee's *definition*, not just a similar-sounding behavior.
 - Delegation-on-error is not success-path parity. A fast path that falls back on failure can still succeed on a candidate the shared rules would refuse.
 - Do not measure before confirming the code path can fire. An A/B whose B-arm cannot execute returns two green runs masquerading as evidence.
@@ -79,7 +79,7 @@ Keep `src/daemon.ts` a thin router and `src/daemon/request-router.ts` orchestrat
 - Lint/format stack is OXC:
   - config: `.oxlintrc.json`, `.oxfmtrc.json`
 - TypeScript is strict enough to surface dead code early: `strict`, `isolatedModules`, `noUnusedLocals`, and `noUnusedParameters` are enabled.
-- The repo emits with `tsdown` (Rolldown), not `tsc`; `pnpm typecheck` runs `tsgo` (native preview), with `typecheck:tsc` as the fallback. If declaration generation fails, inspect `tsconfig.lib.json` first.
+- The repo emits with `tsdown` (Rolldown) and typechecks with `tsgo` (native preview); the `typescript` package is not a dependency, so there is no `tsc` to fall back to. If declaration generation fails, inspect `tsconfig.lib.json` first.
 - Dev-loop staleness has three layers; after editing runtime or runner code: `pnpm build` (dist), restart the daemon (it does not self-reload), and remember `shutdown` deliberately HANDS OFF a healthy simulator runner — the adopted runner keeps serving the old Swift binary until you kill its process or the source fingerprint changes. Verifying "my change did nothing" against an adopted runner is a classic false negative.
 - `tsconfig.lib.json` needs an explicit `rootDir: "./src"` for declaration layout.
 - Use the aggregate scripts in `package.json` when possible; they encode the expected validation bundles better than ad hoc command lists.
@@ -255,7 +255,7 @@ This repo encodes invariants as self-declaring gates. The correct response to a
 - Duplicating logs backend logic in handlers instead of `src/daemon/app-log.ts`.
 - Growing `src/daemon/handlers/session.ts` or `src/platforms/apple/core/apps.ts` further without extracting Apple-family/macOS-specific helpers first.
 - Reintroducing an npm lockfile or assuming ESLint/Prettier still exist in this repo.
-- Changing `tsconfig.lib.json`/build tooling without running `pnpm check:tooling`; declaration generation is stricter than `tsc --noEmit`.
+- Changing `tsconfig.lib.json`/build tooling without running `pnpm check:tooling`; declaration generation is stricter than a plain typecheck.
 
 ## Docs & Skills
 - Versioned CLI help is the agent-facing source of truth. Put workflow guidance/help topics in `src/utils/cli-help.ts`, flags in `src/utils/cli-flags.ts`, CLI command overrides in `src/utils/cli-command-overrides.ts`, and assertions for important copy in `src/utils/__tests__/args.test.ts`.

package.json

@@ -118,7 +118,6 @@
     "check": "pnpm check:tooling && pnpm check:fallow && pnpm check:unit",
     "prepack": "pnpm check:mcp-metadata && pnpm build:all && pnpm package:android-snapshot-helper:npm && pnpm package:android-multitouch-helper:npm",
     "typecheck": "tsgo -p tsconfig.json",
-    "typecheck:tsc": "tsc -p tsconfig.json",
     "test-app:install": "pnpm install --dir examples/test-app --ignore-workspace",
     "test-app:start": "pnpm --dir examples/test-app start",
     "test-app:ios": "pnpm --dir examples/test-app ios",
@@ -223,11 +222,11 @@
     "@typescript/native-preview": "7.0.0-dev.20260613.1",
     "@vitest/coverage-v8": "4.1.8",
     "fallow": "^2.95.0",
+    "oxc-parser": "^0.138.0",
     "oxfmt": "^0.42.0",
     "oxlint": "^1.69.0",
     "skillgym": "^0.9.1",
     "tsdown": "^0.22.3",
-    "typescript": "^6.0.3",
     "vite": "^8.0.16",
     "vitest": "^4.1.8"
   }