refactor(apps)!: delete web-tanstack demo app

Veect retrofit (ADR-027): the product is a hosted SaaS built on
web-next; apps/web-tanstack existed only as template demo surface for
the TanStack Start framework path. This slice removes the app and all
wiring that referenced it:

- turbo.json globalEnv: WEB_TANSTACK_SENTRY_DSN,
  VITE_WEB_TANSTACK_SENTRY_DSN, VITE_GIT_COMMIT_SHA,
  SENTRY_PROJECT_WEB_TANSTACK
- .env.example: the same four DSN/release vars
- generator e2e fixtures that stripped deps from the app's package.json
- coverage diff comment + test fixtures referencing apps/web-tanstack
- app-list entries in README, CLAUDE.md (port table, Sentry projects),
  AGENTS.md (tags, binder list, per-app docs), docs/glossary.md (App)
- pnpm-lock.yaml importer + orphaned transitive deps

Framework-support code in core packages stays: core-trpc's TanStack
provider, core-shared security/tanstack middleware, and the Sentry
react/node init adapters are generic TanStack support, not app wiring.
Prose in guides/ADRs/library traces is story 08 scope.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

.env.example

@@ -27,15 +27,12 @@ CMS_URL=http://localhost:3001
 # WEB_NEXT_SENTRY_DSN=
 # NEXT_PUBLIC_WEB_NEXT_SENTRY_DSN=
 # CMS_SENTRY_DSN=
-# WEB_TANSTACK_SENTRY_DSN=
-# VITE_WEB_TANSTACK_SENTRY_DSN=
 
 # Source-map upload at build time (production only).
 # SENTRY_AUTH_TOKEN=
 # SENTRY_ORG=
 # SENTRY_PROJECT_WEB_NEXT=
 # SENTRY_PROJECT_CMS=
-# SENTRY_PROJECT_WEB_TANSTACK=
 
 # OTel trace sample rate (0.0 = none, 1.0 = all). 0.1 recommended in dev.
 # SENTRY_TRACES_SAMPLE_RATE=0.1
@@ -45,7 +42,6 @@ CMS_URL=http://localhost:3001
 
 # VERCEL_GIT_COMMIT_SHA=
 # NEXT_PUBLIC_VERCEL_GIT_COMMIT_SHA=
-# VITE_GIT_COMMIT_SHA=
 
 # --- Optional: core-audit (only when `gen core-package audit` is scaffolded) ---