Update CHANGELOG.md and debian/changelog for v1.0 stable release

[Copilot]

This PR updates both changelog files to properly document the v1.0 stable release that was merged in September 2025.

Changes Made

CHANGELOG.md

• Added new [1.0.0] - 2025-09-07 section documenting the stable release
• Moved existing content from [Unreleased] to the new stable release entry
• Added notes about GitHub integration, documentation improvements, and promotion from release candidate
• Updated version comparison links to include the new v1.0.0 tag

debian/changelog

• Added new x0 (1.0) entry following Debian changelog format
• Documented key changes including stable release promotion, GitHub integration, and documentation improvements
• Maintained proper Debian changelog formatting with author attribution and timestamp

Context

Both changelog files previously showed v1.0.0-rc1 / v1.0~rc1 as the latest entries from April 2025, but the actual v1.0 stable release was merged in September 2025. This update ensures the changelogs accurately reflect the current stable release status and provide proper documentation for users and package maintainers.

The changes follow existing formatting conventions and maintain consistency with the established changelog structure and versioning scheme.

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[clauspruefer]

Updating CHANGELOG.md and debian/changelog to document the v1.0 stable release

Plan:

* [x]  Explore repository structure and understand current changelog formats

* [x]  Identify that both changelogs currently show 1.0.0-rc1 / 1.0~rc1 as latest entries

* [x]  Determine that a v1.0 stable release needs to be documented (based on merge commit from 2025-09-07)

* [x]  Update CHANGELOG.md to add [1.0.0] - 2025-09-07 entry promoting rc1 to stable

* [x]  Update debian/changelog to add x0 (1.0) entry in proper Debian format

* [x]  Update version comparison links in CHANGELOG.md

* [x]  Validate changes follow existing formatting and conventions

* [x]  Test that changes are properly formatted

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

@copilot: yes, do it!

[Copilot]

Updating CHANGELOG.md and debian/changelog to document the v1.0 stable release

Plan:

...

Done! The changelog updates have been completed as outlined in the plan. Both CHANGELOG.md and debian/changelog now properly document the v1.0.0 stable release from 2025-09-07. All tasks are marked complete and the changes follow existing formatting conventions. (commit 3ac5830)

[clauspruefer]

Looks good, fetch another cup of coffee...

[Copilot]

Pull Request Overview

This PR updates both changelog files to properly document the v1.0.0 stable release from September 2025, which was previously missing from the changelog documentation.

Key changes:

• Added v1.0.0 stable release entries to both CHANGELOG.md and debian/changelog
• Moved unreleased content to the stable release section with additional GitHub integration notes
• Updated version comparison links to reflect the new stable release

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
CHANGELOG.md	Added v1.0.0 release section and updated version comparison links
debian/changelog	Added new stable release entry following Debian changelog format