Add Common Lisp support via SBCL

[nelsonlove]

Summary

Adds Common Lisp as a supported language, executed via SBCL (sbcl --script).

Code blocks tagged lisp get a run button and execute through the generic NonInteractiveCodeExecutor, following the same pattern as Racket:

(format t "Hello, World!~%")

Changes

• src/main.ts — add lisp to canonicalLanguages
• src/settings/Settings.ts — lispPath/lispArgs/lispFileExtension/lispInject + lispInteractive, with defaults sbcl --script, .lisp extension
• src/settings/per-lang/makeLispSettings.ts — new settings panel (mirrors makeRacketSettings.ts)
• src/settings/SettingsTab.ts — register the panel
• src/settings/languageDisplayName.ts — display name "Common Lisp"
• src/RunButton.ts — dispatch case for lisp
• README.md — language list + Common Lisp details block

Testing

• npm run build passes (tsc typecheck + esbuild)
• Verified the exact spawned invocation locally: sbcl --script <tempfile>.lisp runs and prints output (SBCL 2.x via Homebrew, macOS)

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