test: cover actor plugin contract surface

[NathanFlurry]

• Add Rust action contract coverage for every agentOS actor-plugin dispatcher arm.
• Cross-check Rust contract fixtures against TypeScript action/event/DTO declarations.
• Generate the AgentOS actor action type surface from the Rust contract table via build.rs into an ignored local TS file.
• Add a simple always-on package-level actor smoke test and fix actorOptions forwarding plus WriteFileResult typing drift.
• Let the sidecar resolver find repo target/{release,debug} builds like the actor plugin resolver.

Validation:

• cargo test -p agentos-actor-plugin
• cargo check --workspace
• pnpm check-types
• pnpm build
• pnpm --dir packages/agentos build
• pnpm --dir packages/agentos exec vitest run tests/actor.test.ts --reporter=verbose
• pnpm --dir packages/agentos check-types
• pnpm exec biome check packages/agentos/tests/actor.test.ts packages/sidecar-binary/index.js packages/sidecar-binary/index.d.ts
• pnpm exec biome check packages/agentos/package.json packages/agentos/src/actor.ts packages/agentos/src/index.ts packages/agentos/tests/actor.test.ts
• node --test scripts/check-agentos-sidecar-resolver.test.mjs

[railway-app]

🚅 Deployed to the agentos-pr-1649 environment in agentos

Service	Status	Web	Updated (UTC)
agentos	😴 Sleeping (View Logs)	Web	Jul 7, 2026 at 11:46 am

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🚅 Environment agentos-pr-1649 in rivet-frontend has no services deployed.