K2: --help broken on 4 subcommands (manual arg parser treats it as filename)

[noahgift]

Kaizen Surface Gate K2 Failure (4 defects)

--help is not recognized on file-taking subcommands:

• simular run --help → "Error: Failed to read experiment file" (exit 1)
• simular verify --help → "Error: Failed to read experiment file" (exit 1)
• simular emc-check --help → "Error: Failed to read experiment file" (exit 1)
• simular emc-validate --help → "Error: Failed to read experiment file" (exit 1)

The manual arg parser consumes the next positional arg as a filename without first checking for --help/-h.

Five-Whys

1. Why does --help fail? The string "--help" is passed as the filename argument
2. Why is it treated as a filename? Manual arg parsing takes next positional arg without flag check
3. Why manual arg parsing? simular uses custom dispatch instead of clap
4. Why no --help check? The flag check only exists at the top level, not per-subcommand
5. Why not caught? No K2 surface gate testing in CI

Fix

Add --help/-h flag detection before consuming positional args in each subcommand handler. Alternatively, migrate to clap for consistent arg parsing.

Found via kaizen surface gate sweep.

[noahgift]

Fixed in commit 6afc45d — added is_help_flag() check before consuming positional args in all 6 subcommand parsers.