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-# Proactive Error Handling with errore in `run.ts`
-
-Ref: https://errore.org/
-
-## Goal
-
-Replace scattered `process.exit()`, untyped `catch (e: any)`, and inline error handling in `run.ts` with errore's error-as-values pattern. Compile-time exhaustive error handling via `matchError` in a single top-level `action()`.
-
-## Constraints
-
-- `makeAppFromEnv` and `makeConfigApp` are exported — **do not change their return types**
-- `platform.ts` (`startServer`, `serveStatic`, `getConfigPath`) — **unchanged this PR**
-- Keep it simple: errors defined in `run.ts`, not a separate file
-
-## Phase 1: Add errore dependency
-
-- `app/package.json`: add `"errore"` to dependencies
-- Run install
-
-## Phase 2: Define tagged errors in `run.ts`
-
-```ts
-import errore from "errore"
-
-class ConfigLoadError extends errore.createTaggedError({
-  name: "ConfigLoadError",
-  message: "Failed to load config: $reason",
-}) {}
-
-class NeedsBunError extends errore.createTaggedError({
-  name: "NeedsBunError",
-  message: "Config requires Bun runtime",
-}) {}
-
-class NeedsTypeStrippingError extends errore.createTaggedError({
-  name: "NeedsTypeStrippingError",
-  message: "Node $version needs --experimental-strip-types for .ts config",
-}) {}
-
-class ReexecFailedError extends errore.createTaggedError({
-  name: "ReexecFailedError",
-  message: "Re-exec failed: $reason",
-}) {}
-```
-
-## Phase 3: Refactor internal functions to return errors
-
-### `loadConfigFile` → `ConfigLoadError | NeedsBunError | NeedsTypeStrippingError | CliBkndConfig`
-- Use `errore.tryAsync` to wrap `import()`
-- On catch: detect Bun requirement → `NeedsBunError`
-- On catch: other failure → `ConfigLoadError`
-- Before import: check `needsTypeStripping()` → `NeedsTypeStrippingError`
-
-### `reexecWithTypeStripping` / `reexecUnderBun` → `ReexecFailedError | never`
-- Success: `process.exit(0)` (unavoidable — must stop parent after child completes)
-- Failure: return `ReexecFailedError` instead of `process.exit(1)`
-- Caller decides how to handle failure
-
-### `makeAppFromEnv` internal flow (return type unchanged)
-- Internally use error-as-values from `loadConfigFile`
-- On `NeedsBunError` / `NeedsTypeStrippingError`: call re-exec, handle `ReexecFailedError`
-- On `ConfigLoadError`: `console.error` + `process.exit(1)`
-- Keep exported signature: `Promise<App>` (exits on unrecoverable errors)
-
-### `action()` — cleaner top-level
-- `makeAppFromEnv` handles its own error cases internally (since we can't change its return type)
-- `action()` stays thin: call `makeAppFromEnv` → `startServer`
-
-## Phase 4: Verify
-
-- No behavior change for end users
-- All `catch (e: any)` replaced with typed errore patterns
-- `process.exit(1)` consolidated to fewer, explicit locations
-- Re-exec failure paths return typed errors before exiting
-
-## Files Changed
-
-| File | Change |
-|---|---|
-| `app/package.json` | add `errore` dep |
-| `app/src/cli/commands/run/run.ts` | tagged errors, refactored error flow |
-
-## Commit Message
-```
-refactor(cli): use errore for typed error handling in run command
-
-Replace untyped catch blocks and scattered process.exit() with
-errore tagged errors and error-as-values pattern. Compile-time
-safety for error handling paths.
-```