AI-agent assisted catalog quality management via automated issue filing

[Copilot]

Adds scheduled GitHub Actions workflows that (1) auto-file catalog inspection errors as GitHub issues for AI-agent resolution, and (2) delegate savings-bank merger/closure news research to an AI agent — following the repo's existing "detect auto, human merges" philosophy from SITE_HEALTH_WORKFLOW.md.

Changes

• .github/workflows/catalog-quality.yml — Runs checkimages.cs + catalogutil.cs weekly / on docs/ push / manually. On findings, creates or updates a single deduplicated tracking issue (catalog-quality label, max 1 open) embedding the full tool output and remediation steps; auto-closes it once clean. Optional assign_copilot dispatch input assigns the issue to the Copilot coding agent.

• .github/workflows/savings-bank-merger-watch.yml — Monthly (or manual) job that extracts all 저축은행 entries from Catalog.xml and opens a self-contained research issue (savings-bank-merger-watch label) instructing an AI agent to investigate recent mergers/renames/closures against the catalog. Deduped per year-month by title.

• docs/CATALOG_QUALITY_WORKFLOW.md — Documents both flows, the AI-agent task instructions, and the automated-vs-human-approval boundary.

• README.md — Links the new workflows and doc under the quality-tooling section.

Notes for reviewers

• Idempotency: quality flow keys off the label (one living tracking issue); merger flow keys off the year-month in the issue title.
• Detection and issue lifecycle are automated; catalog edits (item deletion, Id/DisplayName changes, merges) remain human-approved. Both workflows explicitly forbid auto-deletion.
• @copilot assignment and gh issue automation depend on repo settings (Actions issues: write, Copilot coding agent enabled); actual issue creation only exercises in the GitHub environment.

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