[codex] fix effect v4 review findings

[Makisuo]

Summary

Applies the whole-repo Effect v4 review fixes across Maple product code.

• Updates Effect service/layer wiring to prefer .layer and keeps local runtime composition aligned across API and alerting workers.
• Tightens Effect v4 conventions around Effect.fn, generator failures, Clock.currentTimeMillis, tagged errors, structured log annotations, and flattened Cause.pretty handling.
• Migrates schema request shapes toward v4 APIs with Schema.optionalKey, branded Hazel/trace/span IDs, and explicit frontend decode boundaries.
• Improves observability conventions, including dual-emitting deployment.environment and deployment.environment.name plus stable annotated log messages.
• Fixes Effect Atom/UI findings by avoiding render-time Atom.make and surfacing explicit Result failure states in settings/install flows.
• Adds local TypeScript path mappings for SDK source subpaths so workspace typechecking does not require prebuilt SDK dist output.

Impact

This should reduce Effect v4 migration risk, make schema/API boundaries more precise, and keep telemetry/logging behavior aligned with Maple conventions without changing public runtime behavior intentionally.

Validation

• bun run typecheck
• git diff --check

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