docs: boocode-lift-analysis, openspec change docs, codesight cache, deps

- Add boocode-lift-analysis.md: comprehensive 30-repo lift matrix across 25 domains
- Add openspec/ change docs: domain2-code-intelligence, domain3-multi-agent, impeccable-wave, streaming-codeblocks
- Update .gitignore: .impeccable/, .omo/, bun.lock, DESIGN.md, PRODUCT.md
- Update dependencies in package.json + pnpm-lock.yaml
- Update .codesight/ analysis cache

.gitignore

@@ -21,3 +21,13 @@ data/*
 !data/coder-providers.example.json
 codecontext/fork.tar.gz
 /Arena
+
+# Auto-generated & scratch artifacts
+.impeccable/
+.omo/
+bun.lock
+DESIGN.md
+PRODUCT.md
+
+# codesight auto-generated analysis cache
+apps/web/.codesight/