v0.3.3

Added

• JitpackScriptGate: a release refuses a JitPack module whose .jitpack/build.sh or statx.c differs
  from the umbrella's tools/jitpack/ or is not committed, or whose jitpack.yml's install does not start
  with it (--force overrides).
• A JitPack failure names a rate limit. When the build log shows Maven Central's 429 Too Many Requests,
  the release's error says so: a rate limit on JitPack's builders, not the module.

Changed

• GatePlan.JITPACK_MAVEN is 3.9.9, the Maven every JitPack build now runs, so JitpackPluginsGate holds
  plugin prerequisites to it, falling back to JitPack's own 3.6.1 for a module whose script gate was forced or
  skipped.

Build

• JitPack builds with .jitpack/build.sh, the umbrella's tools/jitpack/build.sh: Maven 3.9.9 and every
  dependency from Google's mirror of Maven Central first, with backoff and Maven's 429 retry, so Central's
  429 Too Many Requests no longer loses a tag. The statx shim comes with it.