Update documentation for workflow separation

[Copilot]

Updated README.MD to reflect the separation of issue management from project management workflows introduced in commit 99c09e6.

Changes

• Documented add-to-project.yaml: Handles project operations (adding issues/PRs to projects, assigning reviewers). Triggers: issues, pull_request, workflow_call

• Documented manage-issues.yaml: New workflow for issue management with two jobs:

  • manage-stale-issues: Marks unplanned issues as stale, closes after grace period
  • sync-priority: Maps GitHub Project priority fields to P0-P3 labels

  Triggers: schedule (daily), workflow_dispatch, workflow_call

The separation resolves scheduling conflicts - issue management jobs now execute on schedule without restrictions from event-triggered project management operations.

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