feat: publish Regex Tools 0.1.0

docs/ENGINE_BUILDS.md

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+# Engine builds
+
+Version 0.1.0 ships no WebAssembly engine.
+
+`npm run engines:build` verifies that this release has no external pack to
+build. After the production build, `npm run engines:verify` rejects any
+undeclared engine asset and confirms the packaged ECMAScript-only notice.
+Neither command accesses the network.
+
+## PCRE2 feasibility record
+
+The next flavour was spiked outside the application repository against official
+PCRE2 10.47:
+
+- signed tag object `cd007b4466798f66d479d1442a407099e7c40050`;
+- peeled commit `f454e231fe5006dd7ff8f4693fd2b8eb94333429`;
+- licence `BSD-3-Clause WITH PCRE2-exception`;
+- Emscripten 6.0.4;
+- 8-bit library, Unicode enabled, JIT disabled.
+
+Node and Chromium tests demonstrated version/config reporting, Unicode,
+named groups, global substitution, automatic and explicit callouts, and
+match/depth/heap errors. This was a technical spike only. No spike source,
+binary or PCRE2 source is included in v0.1.0.
+
+Production PCRE2 support remains gated on a reviewed bridge, copied DTOs,
+allocation cleanup, exact source build, UTF-8/UTF-16 mapping, trace/output caps,
+worker recovery, deterministic assets, licences and browser conformance.