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feat: task observability — list_tasks, get_task, list_audit_entries tools and MCP audit trail (#1822)

* feat: add task observability with list_tasks, get_task tools and MCP audit trail

- Add list_tasks and get_task read tools to node-agent-tools (workflow sub-sessions)
- Add created_by and created_by_session columns to space_tasks (migration 120)
- Create mcp_audit_log table for MCP write operation traceability (migration 121)
- Add McpAuditLogRepository with createEntry, listBySpace, listByTask, listBySession
- Audit log create_standalone_task, approve_task, send_message (with gate data),
  and save_artifact across space-agent-tools and node-agent-tools
- Pass mySessionId and auditLogRepo through SpaceRuntimeService and TaskAgentManager
- Update space-test-db helper to match migrated schema

* fix: address PR review feedback on task observability

- Scope get_task lookups by space in node-agent-tools: verify task.spaceId
  matches the session's spaceId after UUID lookup to prevent cross-space
  task leakage.
- Preserve creator identity accuracy: use null instead of 'space-agent' fallback
  when myAgentName is unset (member sessions), so created_by is only set when
  the actual agent identity is known. createdBySession still captures the
  session ID for traceability.

* fix: add mcp_audit_log to db-query scope config and update test

- Register mcp_audit_log in SPACE_SCOPE_TABLES with space_id column filtering
- Update scope-config test to expect 15 space-scoped tables including mcp_audit_log

* fix: audit logging accuracy for create_standalone_task and approve_task

- node-agent-tools: move create_standalone_task audit log to AFTER the
  onCreateStandaloneTask callback succeeds, so failed creations (validation
  errors, dependency failures) are not logged as successful writes.
- node-agent-tools: stamp the newly created task ID in the audit entry,
  not the current session task ID, so listByTask(newTaskId) finds it.
- space-agent-tools: add option... (continued)

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