certsf v0.3.0

certsf v0.3.0 is the first non-prerelease release of the 0.3 line. It packages the already staged and verified alpha.1 through alpha.5 scope.

Scope:

• Keeps the 0.2 public wrapper surface.
• Adds explicit custom certified positive-real methods for existing wrappers only:
  • loggamma(method="stirling")
  • loggamma(method="stirling_shifted")
  • loggamma(method="certified_auto")
  • gamma(method="stirling_exp")
  • rgamma(method="stirling_recip")
• Custom methods are explicit only and target finite real positive inputs in the documented domains.
• Default certified loggamma, gamma, and rgamma remain direct Arb.
• method=None and method="auto" remain unchanged.
• Parabolic-cylinder wrappers remain experimental_formula.

Certification boundaries:

• No complete package-wide certification claim.
• No automatic custom-method dispatch.
• No complex Stirling certification.
• No reflection formula certification.
• No near-pole certification.
• No gamma-ratio or beta asymptotics.
• No promotion of parabolic-cylinder formulas beyond experimental_formula.

Release validation:

• TestPyPI staging passed before this release.
• TestPyPI workflow run: https://github.com/yutianlee/certsf/actions/runs/25715127842
• Release tag: v0.3.0
• Package version: 0.3.0