Tasks: AI agent activity bumps workspace deadline #1251

Repo: coder/coder

Scope: When an AI agent reports certain status changes, extend the workspace deadline to prevent auto-stop during active work.

Note: This implements AI agent activity bump for all workspaces (including task workspaces). Task workspaces use the template's regular default_ttl and activity_bump settings. Task-specific TTL columns may be added post-GA if customer feedback indicates a need for different timeout behavior between regular workspaces and task workspaces.

App status states (from codersdk/workspaceapps.go):

• working - AI agent actively processing
• idle - AI agent waiting for input
• complete - task finished successfully
• failure - task encountered an error

Changes:

• Modify patchWorkspaceAgentAppStatus in coderd/workspaceagents.go
• Call ActivityBumpWorkspace based on previous and new state:
  • complete → idle|complete: NO bump (task already done)
  • failure → idle|failure: NO bump (task already failed)
  • All other transitions: bump (includes working, and transitions from working)

Files:

• coderd/workspaceagents.go
• coderd/workspaceagents_test.go

Acceptance criteria:

• working status triggers deadline bump
• Transition from working to other states triggers deadline bump
• complete → idle or complete → complete does NOT trigger bump
• failure → idle or failure → failure does NOT trigger bump
• Tests verify bump is called at correct times
• Existing activity bump behavior (SSH, IDE) unchanged

Dependencies: None

References:

• PRD: Start/Pause/Resume the Task Workspace
• RFC: Tasks: Start/Pause/Resume Lifecycle: TTL Integration