Persist agent session metadata for workspace resume

[Jinwoo-H]

Summary

• capture resumable provider session metadata from agent hooks and relay it into renderer agent status
• persist sleeping agent session records when a workspace sleeps, then restore them from workspace-session state
• add sidebar resume/dismiss actions that create a new agent terminal with the provider CLI resume command
• document verified Codex/Claude/Gemini resume-session behavior and add schema/startup/store regression tests

Closes #1796

Verification

• pnpm exec vitest run --config config/vitest.config.ts src/shared/agent-session-resume.test.ts src/shared/workspace-session-schema.test.ts src/renderer/src/store/slices/store-cascades.test.ts
• pnpm run typecheck:node
• pnpm run typecheck:web
• pnpm run typecheck:cli
• pnpm run lint
• git diff --check
• Electron e2e: verified real sleep capture path stores a sleeping Codex session, the sidebar renders Resume Codex, and clicking it clears the sleeping record, creates a Codex-marked terminal tab in a real workspace, and queues 'codex' 'resume' '' with resume telemetry\n\n## Notes\n- Electron verification intercepted the final queued startup command instead of launching Codex against fake provider session ids; Orca-side capture, persistence, rendering, tab creation, and command generation were exercised end to end.

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