fix(FN-3386): restore workspace verification gates and docs

- Resolve the cli-alias merge conflict by keeping mainline-deletion semantics under smart-prefer-main
- Add TaskCard workspace verification UI behavior and regression coverage
- Update plugin-sdk exports and related task/dashboard documentation for verification workflow

Fusion-Task-Id: FN-3386

docs/dashboard-guide.md

@@ -16,6 +16,7 @@ Features:
 - Inline quick entry creation
 - PR/issue badges with live updates
 - GitHub provenance marker on task cards imported from GitHub (`sourceType: github_import`), shown alongside existing footer metadata like timers
+- Agent-created provenance badge in task card headers for agent-originated tasks (`sourceType: agent_heartbeat` or `sourceType: automation`, or legacy tasks with `sourceAgentId`), with labels preferring `sourceMetadata.agentName` over raw agent IDs
 - Column ordering semantics: `todo` mirrors scheduler pickup order (priority descending, then oldest `createdAt`, then task ID); `triage`, `in-progress`, `in-review`, and `archived` remain priority-first with task-ID tie-breaks; `done` is ordered by most recent completion first (`columnMovedAt`, then `updatedAt`, then `createdAt` fallback)
 
 ![Board view](./screenshots/dashboard-overview.png)

docs/task-management.md

@@ -171,6 +171,8 @@ Example API payload:
 
 ## Task provenance and research enrichment
 
+Agent-created tasks now show a compact **Created by agent** marker directly on dashboard task cards when creation provenance indicates agent/automation origin (`sourceType: agent_heartbeat` or `sourceType: automation`, with legacy fallback to populated `sourceAgentId`). Where available, displays should prefer `sourceMetadata.agentName` over raw `sourceAgentId`.
+
 Research-created tasks show provenance as **Created via Research** in the task detail header and `Source: Research` in `fn task show` output.
 
 When `sourceMetadata.findingLabel` is present, the UI/CLI include it as context; otherwise they fall back to `runId` when available.