Rework: Add backlinks using URL templates instead of ENV

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Description

## Rework of #188

The previous implementation was rejected because it tried to read from ENV at agent runtime, which won't work. This ticket properly implements backlinks using URL templates/placeholders.

## Correct Approach

URL templates should be created **when tickets are created** and stored in the ticket. Workers then simply interpolate these templates with actual IDs.

## Requirements

1. **Add URL template fields to ticket model** - Store templates like:
   - `ticket_url_template`: `"https://app.example.com/tickets/{id}"`
   - `agent_session_url_template`: `"https://app.example.com/agent-sessions/{id}"`
   - These are set at ticket creation time

2. **Update ticket creation** - When creating a ticket:
   - Generate URL templates based on configured APP_URL (available at creation time)
   - Store them in the ticket record
   - Pass them to workers via working_memory or similar

3. **Update git-workflow skill** - When posting to GitHub:
   - Read URL templates from ticket's working_memory
   - Interpolate with actual IDs (ticket_id, agent_session_id, etc.)
   - Include formatted backlinks in PR descriptions/comments

4. **Handle missing templates** - If no templates are present, skip backlinks gracefully

## Example PR Description

```markdown
Implements ticket #42: Add feature X

---
**Links:**
- Ticket: https://app.example.com/tickets/42
- Agent Session: https://app.example.com/agent-sessions/123
```

## Implementation Notes

- APP_URL is read at **ticket creation time** (in planner/stack creation), not at agent runtime
- Workers receive pre-formatted URL templates or already-interpolated URLs
- Document this approach in the git-workflow skill so agents understand how to use it