feat: add Python and Java regex engines

CHANGELOG.md

@@ -2,6 +2,31 @@
 
 ## Unreleased
 
+## 0.3.0 — 2026-07-27
+
+- Add a self-hosted Pyodide 314.0.3 worker containing CPython 3.14.2 `re`, with
+  runtime identity verification, bounded compilation/matching/replacement and
+  exact code-point-to-editor-UTF-16 range normalization.
+- Add TeaVM 0.15.0's `java.util.regex` class-library implementation as a
+  verified self-hosted ES module, with bounded `Pattern`/`Matcher` execution,
+  native replacement and exact UTF-16 ranges.
+- Identify the Java engine as TeaVM class-library code rather than OpenJDK and
+  report its documented `UNICODE_CHARACTER_CLASS`, single-digit replacement
+  and unavailable named-replacement compatibility boundaries.
+- Add partial application-owned Python and Java lexical syntax and replacement
+  providers while keeping the selected runtime compiler authoritative.
+- Separate heavyweight engine loading from the per-request execution deadline,
+  retain worker recovery after timeout/crash/cancellation and keep every
+  runtime local to the release.
+- Add flavour-specific quick reference and capability content for all four
+  executable engines.
+- Keep comparison, generated cases, code generation, minimization, analysis
+  and formatting behind their explicitly verified ECMAScript/PCRE2 boundaries;
+  Python and Java are never routed through another flavour as a fallback.
+- Extend deterministic engine-pack provenance, checksums, licence notices,
+  release verification and nested-path delivery checks to the Python and Java
+  runtime assets.
+
 ## 0.2.0 — 2026-07-27
 
 - Open Quick reference and Capabilities as populated, accessible in-viewport