[workflow-editor] q: collapse three duplicate parent-context blocks into one

[Copilot]

.github/workflows/q.md carried three near-identical conditional blocks — issue, PR, and discussion parent context — each repeating the same "retrieve full details, consider context, inform your analysis" boilerplate with only the noun changed.

Changes

• Deduplicated parent context: the three {{#if}} blocks are replaced by one block on the combined condition, with a single direct sentence covering all trigger types.
• Phase 4 cleanup: two list items were both numbered 1.; the compile instruction was wrapped in a code fence for no reason. Both are now plain numbered prose.
• Lock file: .github/workflows/q.lock.yml regenerated via gh aw compile q. The compiler now emits a single GH_AW_EXPR_F4C95076 env var in place of the three per-event ones.

{{#if ${{ github.event.issue.number || github.event.pull_request.number || github.event.discussion.number }} }}
### Parent Context

This workflow was triggered from a comment on an issue, pull request, or discussion. Retrieve the full details of that item — title, body, labels, changed files, and earlier comments — and use that context to inform your investigation and recommendations.
{{/if}}

Note: this touches protected files (q.md, q.lock.yml), which is why the originating agentic run could not push directly.

• Fixes [workflow-editor] q: collapse three duplicate parent-context blocks into one #2496