altium-cli Format Validation

Cross-reference the code against the documentation and Altium source to find mismatches. This is NOT a code-quality review — it checks whether our implementation matches the documented format specification and the original Altium source code.

When you find ambiguity (docs say one thing, C# says another, or neither is clear), ask the user rather than guessing. Flag ambiguities separately from definite errors.

For each finding, report:

1. Rule violated (by name from the checklist)
2. Code location (file:line)
3. Documentation or source reference (doc file + section, or C# file + class/method)
4. What's wrong (concrete description of the mismatch)
5. Suggested fix (or "AMBIGUOUS — needs user decision" with the options)

At the end, give a summary: total findings grouped by category (MISMATCH / GAP / AMBIGUITY).