fix: resolve 6 critical bugs from deep code review (round 2)

[jackwener]

Summary

Fixes the remaining 6 Critical issues from the deep code review (round 1 fixed security issues in PR #335).

• execution.ts: Guard lazy-loaded func commands against null page — throw a clear CommandExecutionError instead of cryptic TypeError when a lazy module incorrectly requires browser context
• daemon.ts: Fix readBody race condition — add aborted flag to prevent req.destroy() from triggering both reject and resolve on the same Promise (truncated data processing)
• browser/cdp.ts: Prevent CDPBridge.connect() reentry — throw if already connected instead of silently leaking the previous WebSocket
• interceptor.ts: Store intercept pattern in a separate global so installInterceptor with a new pattern updates the match condition instead of being blocked by patchGuard
• record.ts: Always call cleanupEnter() after Promise.race — previously only called in timeout path, leaving readline open on Enter exit. Removed dead enterRace variable
• generate.ts: Fix undefined entering String.includes() — c.name?.toLowerCase() returns undefined which gets coerced to string "undefined", causing false positive candidate matches

Test plan

• All 330 unit tests pass
• TypeScript typecheck passes
• Manual: verify interceptor pattern update works across multiple installInterceptor calls
• Manual: verify record mode exits cleanly on Enter press

🤖 Generated with Claude Code

[jackwener]

Reviewed and merged. The 6 critical fixes are coherent, regression risk is low, and local validation passed (npm run typecheck, npm test). Thanks for the fast follow-up.