ci(lint): add ASCII character check using ripgrep

[raballew]

Summary

• Adds an ascii-check job to the lint workflow that uses rg '[^\p{ASCII}]' to flag non-ASCII characters (em-dashes, en-dashes, curly quotes, emoji, etc.) that render poorly or break in terminals
• Excludes .cast and .html files which legitimately contain non-ASCII content
• Currently there are ~1,104 lines with non-ASCII characters across tracked files that need to be fixed before this check can be enforced

Test plan

• Verify the ascii-check job runs in CI (it will fail on existing violations -- expected)
• Incrementally fix non-ASCII findings across the codebase
• Once clean, the job gates future PRs from introducing new non-ASCII characters

🤖 Generated with Claude Code

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