Enable exactOptionalPropertyTypes; widen optional props that accept undefined

[lwwmanning]

Summary

Turns on TypeScript's exactOptionalPropertyTypes, which distinguishes between:

• prop?: T — can be omitted entirely (callers must omit, not pass explicit undefined)
• prop?: T | undefined — optional and explicitly accepts undefined

Three call sites trip on this, all with the same shape: a value that's genuinely T | undefined at the source (frontmatter excerpt, optional check message) being passed into a prop?: T slot. The renderer/consumer in each case already handles undefined with a truthiness check, so the natural intent is "optional in either form" — widen the signature to prop?: T | undefined rather than reshape the call sites with conditional spreads.

Type widenings:

• scripts/verify.ts — CheckResult.msg: ?: string → ?: string | undefined
• src/lib/og.tsx — renderOgImage params: description and eyebrow widened on both the public function signature and the internal OgCard component

No behavioral change. The OG card still renders the description / eyebrow only when truthy; verify.ts's failure messages still serialize as before. The flag flip is the substantive change; the type tweaks are scaffolding to keep tsc happy.

Test plan

• CI green (lint, build, typecheck, verify, audit, dependency-review)
• Vercel preview: /blog/<slug>/opengraph-image renders correctly for posts with and without an excerpt (eyeball both — pick a post with an excerpt frontmatter field and one without)
• bun run verify against the preview surfaces failure messages cleanly when intentionally broken (regression check on verify.ts CheckResult plumbing)

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
vortex	Ready	Preview, Comment	May 4, 2026 6:54pm