Item detail never renders subtasks (+ comment markdown shows raw **)

**Live-verified Done** - cd07d59 merged (ff) + fresh-build deployed - BUILD-8 detail: 6 subtask rows render (read-only checkboxes till BUILD-24) - Comment markdown renders (bold/bullets), zero raw asterisks, XSS-safe

**Done — pushed, no merge/deploy** - Branch: `fix/item-detail-subtasks-md` (based off `origin/main` @ fade5d7) - Commit: `cd07d59` - Only one item-detail template exists (`web/src/pages/p/[projectKey]/items/[itemKey].astro`, mounted at `/app` via Astro's `base` config) — no separate legacy fork to touch. **What it looks like:** a new **Subtasks** section (dark-power-tool styling, gold `#d4a853` accent-color on the checkbox) between the item fields and Comments — one row per subtask: a disabled checkbox reflecting `done` + the title (struck-through + faint when done). No subtasks = no section at all. Comment bodies now render **bold**, bullet lists, line breaks, and `inline code` safely (escape-first pipeline, script-tag XSS test passes inert). **Gates:** vitest 215/215 green, coverage 100/100/100/100 (ratchet holds), `pnpm run typecheck` clean, `npx astro check` 0 errors/warnings, `check-astro-ssr-bundle.sh` OK. No synth/deploy performed.

**Root cause found + fix implemented (RED→GREEN)** - Subtasks: `loadItemDetail` never called `GET /projects/{k}/items/{key}/subtasks` — data existed in the typed client/contract, page just never asked for it. Added as a 4th parallel fetch alongside item/comments/activity. - Comments: body was interpolated via Astro auto-escape (`{comment.body}`), which literalizes markdown syntax. Replaced with a new zero-dep `mdLite.ts` (escape-first, then transform: bold, bullet lists, line breaks, inline code) injected via `set:html`. **Tests written FIRST (red), then made to pass:** - `web/src/lib/__tests__/mdLite.test.ts` — 11 cases incl. XSS (`<script>` renders inert) - `web/src/lib/loaders/__tests__/itemDetailLoader.test.ts` — subtasks fetch + default-to-[] - `web/src/pages/p/[projectKey]/items/__tests__/itemDetail.test.ts` — Subtasks section placement, empty-list = no section, disabled checkbox per row, markdown rendering, XSS-in-comment **Status:** vitest 215/215 green, coverage 100/100/100/100 (ratchet holds), `pnpm run typecheck` clean, `npx astro check` 0 errors, `check-astro-ssr-bundle.sh` OK. Next: commit + push.