Release: promote develop → main (landing page + waitlist)

[davgonsan]

Promotes develop into main. One substantive change since the last promotion:

Landing page in the monorepo + waitlist backend (73c5d1d)

• web/landing/ — Vite/React landing page (new workspace web/*), built to static files; the backend serves it at GET / same-origin (graceful JSON fallback when unbuilt).
• POST /waitlist — rate-limited (10/min), email validated + normalized, country length-bounded, dedup on resubmit; Resend confirmation email + audience segment (env-only key, no-op when unconfigured). Supabase + in-memory fallback repo, matching the house pattern.
• Dockerfile builds the landing during image build (static output, no runtime server).

Closes the 2026-06-29 meeting items: move the landing into the monorepo, replace the 50-registration form (Resend).

Verified

• bun test → 31 pass / 0 fail
• backend tsc --noEmit → clean (includes waitlist/resend code)
• web/landing vite build → ✓
• No secrets committed (checked .env.examples, resend.ts, source tree)

Known pre-existing (not a regression)

Root bun run build fails because packages/shared/backend lack build scripts — that's open PR #22 (currently targeting main; asked to retarget to develop).

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