feat(httpapi): bridge project update endpoint

[kitlangton]

Summary

• Bridge PATCH /project/:projectID through the experimental HttpApi path.
• Add an Effect schema for project update payloads while preserving existing Hono/Zod behavior.
• Add bridge coverage for project updates and persisted project list state.
• Document the smaller remaining-PR plan in the HttpApi migration spec.

Tests

• bun typecheck from packages/opencode
• bun run test:ci test/server/httpapi-instance.test.ts from packages/opencode
• bun run test:ci test/server/httpapi-*.test.ts from packages/opencode
• ./packages/sdk/js/script/build.ts
• bun turbo typecheck