bug: implementer inconsistently adds aw label to PRs

[microsasa]

Bug

The issue-implementer instructions say "Add the aw label to the PR" but the agent sometimes doesn't include it in the create_pull_request call. PRs #85 and #91 got the label; PR #93 did not.

Without the aw label, the quality-gate noop's (step 1: check for aw label), the PR never gets approved, and auto-merge never fires.

Root Cause

The aw label depends on the agent remembering to include it — it's instruction-level, not config-level. Agent behavior is non-deterministic.

Fix

Add labels: ["aw"] to the create-pull-request safe-output config in issue-implementer.md. This makes the label automatic at the config level — the agent can't forget it.

Observed On

PR #93 — no aw label → quality-gate noop'd → auto-merge blocked.