wip: course website (incomplete — Task 15 in progress)

Partial: Astro Starlight config, sync-content.mjs + 6 passing tests.
Missing: pages (index, disclaimer, about), harness page, lockfile,
verified build. See SDD ledger.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

site/tsconfig.json

@@ -0,0 +1 @@
+{ "extends": "astro/tsconfigs/strict", "include": [".astro/types.d.ts", "**/*"], "exclude": ["dist"] }