CDP-5969: replace hand-synced lib/version.ts with build-time generation

[senechko]

Summary

• Generate lib/version.ts at build time via update-version.js instead of manually syncing it
• Add generation to prepare (runs after npm ci) so the file exists before tests on clean checkouts
• Gitignore lib/version.ts — it's now a build artifact, not a source file
• Remove check-version.ts and its pre-commit hook (~500ms saved per commit)
• Remove the version npm lifecycle script (no longer needed)

Closes CDP-5969

Context

PR #105 introduced the hard-coded version file because some bundlers couldn't resolve package.json at runtime. That's still valid — this PR keeps the same generated output, just automates the sync so it can't drift.

How it works

Entry point	What runs
npm ci / npm install	prepare → husky && node update-version.js
npm run build	node update-version.js && tsc
npm publish	prepublishOnly → build → generates + compiles

The version file is always regenerated from package.json before it's needed.

Test plan

• npm ci on clean checkout generates lib/version.ts
• npm test — 162 tests pass, 100% coverage
• npm run build — compiles cleanly
• npm run lint — no issues
• Verified dist/lib/version.js contains correct version string
• Codex CLI review — caught and fixed clean-checkout CI issue

🤖 Generated with Claude Code

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Note

Low Risk
Build and git workflow only; the generated version string behavior stays the same for consumers.

Overview
lib/version.ts is no longer checked in; it is gitignored and regenerated from package.json by update-version.js during npm run build and prepare (after install), so clean checkouts still get the file before tests or compile.

The manual sync guard is removed: check-version.ts and its husky pre-commit step are deleted, and the version npm lifecycle script is dropped in favor of always running generation in prepare / build.

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[senechko]

Closing in favor of #210, which takes a simpler approach by keeping lib/version.ts checked in rather than gitignoring it — avoids the clean-checkout issue.