v0.21.0

host::compose lands in the live app — composable subdomains are now real,
iframe-free pixels — plus a proof-of-spec gate so features ship verified, and a
fix for a mobile-reset identity brick.

Added

• host::compose in the browser app — ?compose=a,b,c fetches each named
  subdomain's published app.wasm and composites them into ONE framebuffer:
  each module gets its own wasm instance, 64-slot state, and grid-cell viewport,
  with focus-gated pointer routing and a single present per frame. Replaces the
  old embed-iframe grid (the "no iframes" rule). Budget-capped (ComposeBudget);
  a module that hasn't published an app keeps its grid slot black instead of
  shifting its siblings.
• Proof-of-spec gate (scripts/verify.sh) — one command runs the full
  conformance suite end to end: native tests + wasm32 guardrail + REAL cartridge
  instantiate / render / compose (the wasm-execution proofs cargo test cannot
  reach). Wired into release.sh so no release skips it.

Fixed

• Mobile reset no longer bricks identity — "reset this device" was a
  local-only OPFS delete that destroyed the master seed with no backup and no
  recovery door. Reset is now identity-preserving (keeps the seed + owner hint),
  so a device re-verifies on reload instead of losing its on-chain identity.
• Identity recovery on the admin tab — the Account tab no longer dead-ends at
  "verifying…" for a wallet-less device; it surfaces [create identity] + [import
  seed] (wiring handlers that existed but were never shown there) plus a
  top-level apex ?adopt=1 restore link (mobile-correct, where the signer iframe
  is dead).
• Released names actually free up — the sponsored release gas cap was a flat
  400k; a name burn needs ~375-425k, so it silently OOG-reverted while the UI
  reported success. Raised to 1M (over-budget is free — the sponsor pays gas
  used).

Internal

• Compose scheduling, budgets, content-hash cache, focus routing, and grid
  layout live in native-tested crate::compose / crate::raster; the wasm-only
  app::display carries no untested geometry.