chore(main): release 10.0.0

[github-actions]

🤖 I have created a release beep boop

10.0.0 (2026-06-05)

⚠ BREAKING CHANGES

• Replace Python 2-style ABC patterns with Python 3 equivalents for stricter enforcement (#430)

Features

• Drop persistent-store cache after FDv2 in-memory store init (#426) (563b87a)

Bug Fixes

• align FDv2 goodbye event with spec (reason-only) (#422) (84b442d)
• honor server-directed FDv1 Fallback Directive in initializer phase (#423) (7c49bc0)
• Replace Python 2-style ABC patterns with Python 3 equivalents for stricter enforcement (#430) (22b8fe5)

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Note

Medium Risk
Major semver with a breaking change to ABC enforcement for custom integrations, plus FDv1/FDv2 data-path behavior changes; this PR itself is only version/docs updates.

Overview
Release 10.0.0 bumps the package from 9.15.1 to 10.0.0 across .release-please-manifest.json, pyproject.toml, ldclient/version.py, and PROVENANCE.md, and adds the 10.0.0 section to CHANGELOG.md.

Documented user-facing changes in this major (from prior merged work, not in this diff):

• Breaking: Python 2–style ABC patterns are replaced with Python 3 equivalents, so custom subclasses of SDK extension points (e.g. hooks, data stores) may fail at instantiation if they do not implement required abstract methods.
• Feature: Persistent-store cache is dropped after FDv2 in-memory store initialization.
• Fixes: FDv2 goodbye events are reason-only per spec; FDv1 initializer honors server-directed fallback directives.

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