Codebase cleanup: strict ESLint, CLI refactoring, versioned installer

[MelbourneDeveloper]

TLDR;

Comprehensive cleanup pass: strict ESLint rules across the VsCode extension, CLI refactoring for maintainability, versioned CLI installer, and expanded test coverage.

Details

• ESLint overhaul: New shared eslint-rules.cjs with all TypeScript-ESLint rules set to error. Updated eslint.config.mjs to use it. Fixed all violations across every extension source file (sorted imports, const declarations, removed type assertions, array-simple style, explicit member accessibility).
• CLI (F#) refactoring: Extracted printNdjson, formatAndExit, runDirectory, mergeVars helpers in Program.fs. Cleaned up Runner.fs and Output.fs.
• Versioned CLI installer: CLI now has --version flag. Extension checks installed version against CLI_REQUIRED_VERSION constant and re-downloads on mismatch. Download URLs pinned to version tag.
• Build scripts: Rewrote build-vsix.sh (universal VSIX, no bundled CLI), updated build-cli.sh and build-all.sh with version verification, cleaned up clean-install.sh.
• Tests: Added 907-line htmlUtils.test.ts unit test suite. Improved e2e tests with additional assertions and lint compliance. Added ecommerce-spec.json test fixture.
• New files: watchers.ts for file watcher setup, LICENSE (MIT), docs/vsix-binary-audit.md audit document.
• CLAUDE.md: Refined coding guidelines (regex policy, named params threshold, logging, testing rules).
• Removed: Deleted unused scripts/package.sh.

How do the tests prove the change works

• htmlUtils.test.ts validates all HTML utility functions (report generation, escaping, formatting) with comprehensive assertions
• E2e tests updated to pass under strict lint rules while maintaining all existing behavioral assertions
• Build scripts include version verification steps that fail the build if CLI version doesn't match