🤖 Fix: fmt-check silently passing + add screenshot script

[ammar-agent]

Problems

1. fmt-check was silently passing even with unformatted code

   • Makefile piped prettier --check through grep -v 'No files matching'
   • Piping replaced prettier's exit code (1) with grep's (0)
   • CI showed warnings but jobs passed ✅

2. No convenient workflow for adding screenshots to docs

Solutions

Fixed fmt-check exit code handling:

-@bun x prettier --check $(PRETTIER_PATTERNS) 2>&1 | grep -v 'No files matching'
+@bun x prettier --check $(PRETTIER_PATTERNS)

Added scripts/quick-cp-screenshot.sh:

• Finds latest screenshot from ~/Documents/Screenshots or ~/Desktop
• Converts PNG to WebP using cwebp -q 85 (as lint requires)
• Saves to docs/img/<name>.webp
• Removes original screenshot

Usage: ./scripts/quick-cp-screenshot.sh my-feature

Formatted previously unformatted files:

• vim.ts, vim.test.ts (from PR 🤖 Fix: Vim 'e' motion and add '_' motion #116)
• vim-mode.md (underscore escaping)
• context-management.md (existing edits from main)

These files were already unformatted in main because fmt-check was passing incorrectly.

Verification

make fmt-check now properly fails when files need formatting:

[warn] docs/vim-mode.md
make[1]: *** [Makefile:89: fmt-check] Error 1

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