Update changelog

[DHUKK]

No description provided.

[Copilot]

Pull request overview

Updates public-facing imports and documentation to reflect top-level pygwire exports and recent exception/module organization changes, and records those changes in the changelog.

Changes:

• Update tests/docs to import public APIs from pygwire (and StateMachineError from pygwire.exceptions in one test).
• Stop advertising StateMachineError via pygwire.state_machine.__all__.
• Expand the [Unreleased] section and update compare/release links in CHANGELOG.md.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/unit/test_state_machine.py	Adjusts StateMachineError import location.
tests/unit/test_codec.py	Updates StateMachineError import to use the top-level package.
src/pygwire/state_machine.py	Removes StateMachineError from __all__.
docs/reference/state-machine.md	Updates examples to import from pygwire.
docs/reference/connection.md	Updates example imports to use top-level exports.
docs/reference/codec.md	Updates decoder imports to use top-level exports.
CHANGELOG.md	Adds/updates Unreleased entries and link targets for 0.0.2.

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