docs(changelog): version 1.6.0 [citest_skip]

[richm]

Update changelog and .README.html for version 1.6.0

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

Documentation:

• Add changelog entry for version 1.6.0, including new features and CI-related changes.

[sourcery-ai]

Reviewer's Guide

Bumps the documented project version to 1.6.0 by adding a new changelog section with feature and CI-related updates.

File-Level Changes

Change	Details	Files
Document release 1.6.0 in the changelog, including one new feature and multiple CI and tooling updates.	Add a new [1.6.0] section dated 2026-04-28 to the top of the changelog. List the new feature for role fingerprints being added to syslog. Summarize various CI, ansible-lint, tox-lsr, Testing Farm, and certification-related updates under 'Other Changes'.	CHANGELOG.md

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