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Epic P4. Migrates plain throw new Error to the typed-error classes in the four locked subdomains, and makes the taxonomy erasable-syntax-compatible so it can be adopted across UI-reachable code. Migration (cliproxy/auth, web-server/routes, auth): - 21 of 23 throws in the locked subdomains now use typed subclasses (ProfileError, AuthError, ConfigError, ValidationError, ProviderError). - Typed adoption in locked subdomains: 0/23 -> 21/23 (91.3%), > 40% target. - Overall typed adoption: 0.9% -> 8.6%. - Messages preserved exactly (message-based tests stable). Exit codes now differentiate via handleError (ProfileError=7, AuthError=4, ConfigError=2, ProviderError=6). ccs doctor 0/1 contract untouched (outside scope). Erasable-syntax fix (unblocks the migration in the UI build graph): - exit-codes.ts: enum ExitCode -> const object + union type (value and type usage both preserved; no Object.values(ExitCode) consumers). - error-types.ts: constructor parameter properties -> explicit readonly field declarations + body assignment. - The web UI build enforces erasableSyntaxOnly (ui/tsconfig.app.json) and reaches src/errors via the @shared -> src/auth graph; pre-erasable error-types blocked the build once profile-registry adopted typed errors. Compat audit: docs/reports/typed-error-exit-code-compat-audit.md (Q1 resolved: migrate freely; only documented contract is ccs doctor, which is untouched). Behavior-lock: src/errors/__tests__/typed-error-migration-exit-codes.test.ts (taxonomy -> exit-code mapping, instanceof chains, context fields). validate + validate:ci-parity green (incl. UI build).