v0.26.0

Native code-intelligence — complete (S2/S3)

• Native Go Python + Rust extractors, Okapi BM25 search-code, SimHash near-dup check-duplicate,
  find-type-usages, validate-cross-deps, and Merkle-tree incremental diffing — all pure Go (no CGo), wired as
  the primary path in donmai code *, with the external shim retained behind DONMAI_CODE_BIN. Code-intel is now
  fully native (S0–S3). (#125)

Native arch-intelligence (diff/gate layer) + de-brand

• donmai arch assess now has a native regex diff/gate path (mode: native-diff-only) — no hard-fail when the backend
  binary is absent; de-branded (af-arch→donmai-arch, AGENTFACTORY_ARCH_BIN→DONMAI_ARCH_BIN). The full
  LLM+SQLite drift pipeline remains behind DONMAI_ARCH_BIN (a scoped native-port followup). (#124)