compat: continuous npm-package validation

[TheHypnoo]

Nightly job tries perry.compilePackages on a prioritized list by npm download count (express, zod, prisma, hono, vitest, pino, …). Report first failing line per package, track over time.

Subsumes #440, feeds #115. Part of #793.

[proggeramlug]

Initial harness scaffolding committed in this iteration. Tier1 first-run results:

Package	Result	Note
nanoid	pass	✓
ms	pass	✓
zod	compile-fail	#836 (cross-module class re-exports + null/undefined wrapper symbols)
uuid	compile-fail	#837 (`default` export wrapper missing)
dayjs	run-fail	#838 (prototype-method dispatch on compiled packages)
chalk	run-fail	#838 (callable+properties Proxy-shape)

Tier1 "pass" rate is 2/6 today.

Harness writes a CSV row per run to `test-compat/npm-sweep-history.csv` — the trend signal #805 was asking for. Currently runs ad-hoc; nightly cron CI job is a one-line follow-up once the harness is reviewed and merged.

Improved the error-line extractor to surface the first undefined symbol (rather than "Error: Linking failed") so the CSV is actionable as a regression-debug artifact.