v0.12.0

Optimising compiler — roadmap §4.3 (Bytes-ids, the rewrite half).

Added

• redstart fix --ids — the W040 autofix. Turns the String→Bytes id
  lint into an opt-in, in-place rewrite: it flips the entity's schema declaration
  to Id<Bytes> and drops the .toHexString() at every construction site, in
  one coordinated pass across all modules. A Bytes id indexes ~28% faster and
  stores ~48% less than the equivalent hex-string id (Edge & Node benchmark).

  Conservative by construction — an entity is converted only when every one of
  its id sites (in handlers, functions and test blocks) is provably a single
  stringified Bytes/Address value. A single literal-string id, composite key,
  or id built via an intermediate local and the whole entity is left untouched and
  reported (⤫ Entity skipped: …), so the command never emits code that fails to
  check. It re-verifies the result and refuses to leave a broken tree.

  --dry-run previews the plan without writing. Because a Bytes id changes the
  stored id representation (hex-string → raw bytes), this is a deliberate data
  change — hence opt-in — so redeploy affected subgraphs from the relevant block.
  redstart explain W040 now points at the fixer.