release: add explicit resume command

[jasonkuhrt]

Summary

• add an explicit release resume command for interrupted durable workflows
• add a typed executor resume API that refuses fresh or already-completed plans
• point status and executor recovery guidance at release resume and cover the explicit resume path with end-to-end tests

Closes #158

Verification

• bun run --cwd packages/release check:types
• bun run --cwd packages/release test packages/release/src/api/executor/resume.test.ts packages/release/src/api/executor/e2e.test.ts packages/release/src/api/executor/status.test.ts packages/release/src/cli/help.test.ts
• bun run release:verify
• git diff --check

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This change is