Add reject transition from in_progress status

Tinker

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Description

## Problem
When a PR in `in_progress` status has issues and needs to be rejected, the `reject` transition is not available. The reviewer should be able to reject work at any stage.

## Current Behavior
- From `in_progress`: can only `submit_review`, `complete`, `approve`, `block`, `cancel`
- From `pending_approval`: can `approve` or `reject`

This means if a worker creates a PR and the reviewer sees issues, they have to either:
1. `block` the ticket (wrong semantic - ticket isn't blocked, the PR is rejected)
2. `cancel` the ticket (too extreme - we still want the work done)

## Expected Behavior
- From `in_progress`: should allow `reject` → transitions back to `todo` or similar
- Worker gets notified their PR was rejected and needs fixes

## Solution
Add `reject` transition from `in_progress` status that transitions the ticket back to an actionable state (e.g., `todo` or keep in `in_progress` but mark PR as rejected).

## Acceptance Criteria
- `reject` transition available from `in_progress` status
- Rejected tickets return to work queue for workers to fix
- Clear semantic: "PR rejected, needs fixes" vs "ticket blocked"