Ensure scheduled post-meeting-notes runs execute with dry-run disabled

[Copilot]

Scheduled executions of post-meeting-notes.yaml were unintentionally treated as dry-runs because workflow_dispatch inputs are absent on cron triggers, causing the script fallback ("true") to take effect. This change makes scheduled runs post comments normally while preserving manual dry-run control.

• Workflow behavior fix

  • Updated DRY_RUN env assignment to branch on trigger type:
    • schedule → force "false"
    • workflow_dispatch → keep inputs.dry_run

• Scope

  • Single-line change in .github/workflows/post-meeting-notes.yaml
  • No changes to note discovery, filtering, or posting logic in the embedded Python script

DRY_RUN: ${{ github.event_name == 'schedule' && 'false' || github.event.inputs.dry_run }}

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