fix(workflows): align scheduled-fix previous-findings wording

## Summary
- updated `.github/workflows/gh-aw-scheduled-fix.md` so its **Previous Findings** section consistently references PR creation rather than issue filing
- updated `.github/workflows/gh-aw-fragments/previous-findings.md` to output-neutral wording that works for both reporting and fixing workflows
- regenerated compiled workflow outputs with `make compile`, which updates affected `*.lock.yml` files that import the shared fragment

## Why
Scheduled Fix is explicitly a PR-producing workflow, but its previous-findings guidance used issue-filing language. This change removes that contradiction and keeps shared dedupe guidance reusable.

Closes #1018

## Validation
- `make compile`
- `make lint-workflows`

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[What is this?](https://ela.st/github-ai-tools) | [From workflow: Trigger Text Auditor](https://github.com/elastic/ai-github-actions/actions/runs/24892379796)

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---

> [!NOTE]
> This was originally intended as a pull request, but the git push operation failed.
>
> **Workflow Run:** [View run details and download bundle artifact](https://github.com/elastic/ai-github-actions/actions/runs/24892379796)
>
> The bundle file is available in the `agent` artifact in the workflow run linked above.

To create a pull request with the changes:

```sh
# Download the artifact from the workflow run
gh run download 24892379796 -n agent -D /tmp/agent-24892379796

# Fetch the bundle into a local branch
git fetch /tmp/agent-24892379796/aw-fix-issue-1018-scheduled-fix-wording.bundle refs/heads/fix-issue-1018-scheduled-fix-wording:refs/heads/fix-issue-1018-scheduled-fix-wording-1b86f3566f224dc1
git checkout fix-issue-1018-scheduled-fix-wording-1b86f3566f224dc1

# Push the branch to origin
git push origin fix-issue-1018-scheduled-fix-wording-1b86f3566f224dc1

# Create the pull request
gh pr create --title 'fix(workflows): align scheduled-fix previous-findings wording' --base main --head fix-issue-1018-scheduled-fix-wording-1b86f3566f224dc1 --repo elastic/ai-github-actions
```