chore: archive remaining OpenSpec proposals

Archived proposals:
- add-trigger-conditions-weekly-subscription: Trigger conditions and weekly subscription
- update-api-consistency: WebSocket auth, optimistic locking, workload defaults

All implementations were already complete in previous commits (f5f870d).
Updated tasks.md with implementation summary.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

openspec/specs/resource-management/spec.md

@@ -128,15 +128,25 @@ The system SHALL provide a visual workload heatmap interface for managers.
 
 #### Scenario: View workload heatmap
 - **GIVEN** user is logged in as manager or admin
-- **WHEN** user navigates to /workload page
+- **WHEN** user navigates to /workload page without filters
 - **THEN** system displays a heatmap showing all accessible users' workload
+- **AND** users with zero workload are included by default
 - **AND** each user cell is color-coded by load level (green/yellow/red)
 
+#### Scenario: Hide empty workloads
+- **GIVEN** user is viewing the workload page
+- **WHEN** user enables the hide_empty filter
+- **THEN** the heatmap excludes users with zero workload
+
 #### Scenario: Navigate between weeks
 - **GIVEN** user is viewing the workload page
 - **WHEN** user clicks previous/next week buttons
 - **THEN** the heatmap updates to show that week's workload data
 
+#### Scenario: Default week window on Sunday
+- **GIVEN** today is Sunday and user opens workload page without selecting week_start
+- **THEN** the default heatmap window includes tasks due in the upcoming week
+
 #### Scenario: View user workload details
 - **GIVEN** user is viewing the workload heatmap
 - **WHEN** user clicks on a specific user's cell