fact-check

# Fact Check Verify the factual accuracy of a document against the actual codebase and git history. Extracts verifiable claims, checks each against source, corrects inaccuracies in place, and adds a verification summary. This is not a re-review. It does not second-guess analysis, opinions, or design judgments. It does not change the document's structure or organization. It is a fact-checker — it verifies that the data presented matches reality, corrects what doesn't, and leaves everything else alone. ## Instructions ### Format Detection `--format` controls which verification-summary block to inject: | Flag | Values | Default | Meaning | |------|--------|---------|---------| | `--format` | `html` \| `md` | auto | Auto-detected from the input file extension (`.html` → html block, `.md` → markdown block). Override when the input is a generic text file or when you want a markdown summary inside an HTML document | **Principle:** Fact-check edits the source document in place. The format flag only governs the **verification summary** appended at the end — HTML summary uses KPI cards + `<details>` blocks, markdown summary uses a table + bullet lists. Auto-detection is almost always correct; override only for edge cases. ### Target File Detection Determine what to verify from `$1`: 1. **Explicit path**: Verify that specific file (`.html`, `.md`, or any text document) - Resolve relative paths against cwd 2. **No argument**: Auto-detect the most recent report of either form...