fix(cli): scope sessions and resume flags to current workspace

[cte]

Summary

• scope session lookup to the active workspace for --continue and --session-id
• scope roo list sessions to the active workspace
• include a top-level workspace field in roo list sessions --format json output
• add a shared CLI task-history helper with workspace filtering/resume-id resolution and tests
• update list command tests for workspace-scoped output

Validation

• pnpm --filter @roo-code/cli test -- src/lib/task-history/tests/index.test.ts src/commands/cli/tests/list.test.ts
• pnpm --filter @roo-code/cli check-types
• pnpm --filter @roo-code/cli lint
• manual: pnpm dev --print --provider openrouter --api-key test --session-id <id-from-other-workspace> now errors with "Session not found in current workspace"

Interactively review PR in Roo Code Cloud