relicense to Apache 2.0 from LGPL-3.0, bump to 1.0.0

Versions 0.4.x and earlier remain available on Maven Central under
LGPL-3.0. Version 1.0.0 and later are released under Apache 2.0.

Sole copyright holder is Jonathan Putney. AI-assisted commits in the
repository history were reviewed and accepted by the copyright holder
before this relicense; their scope is GitHub Actions CI configuration
only and contains no Java source code.

- LICENSE: replaced with Apache 2.0 text; COPYING.LESSER removed
- NOTICE: added (minimal, names the copyright holder)
- pom.xml: license metadata updated; version 0.4.2-SNAPSHOT to 1.0.0-SNAPSHOT;
  LICENSE and NOTICE now embedded in META-INF of the built JAR
- README: license badge and section updated; historical note retained
  pointing pre-1.0 users at the LGPL-licensed releases
- 422 Java source files: header rewritten to Apache 2.0 short form
  carrying SPDX-License-Identifier: Apache-2.0
- 15 LGPL-tagged test fixtures (logback-test.xml plus SCORM 1.2 fixtures
  authored in this repo): headers rewritten to match. Third-party SCORM
  fixtures (ADL Golf Examples, cmi5 reference content) are untouched.

Author: jcputney