bump version 6.6.0

[borisstoyanov]

Prepares the tree for the 6.6.0 release (step 2.2 of the release process).

Changes

File	From	To
config/about.go	6.6.0-SNAPSHOT	6.6.0
snap/snapcraft.yaml	version: &release_tag 6.5.0	6.6.0
CHANGES.md	—	new Version 6.6.0 section

The snapcraft anchor is reused by source-tag and CMK_TAG, so the single edit on line 3 updates all three.

Changelog entry

Drawn from the 25 commits since the 6.5.0 tag. Please correct the wording if anything reads wrong.

Version 6.6.0
=============
This release includes:
- Adds support for API request signing with HmacSHA512
- Adds a switch command to change the active server profile from the shell
- Adds support for configuring cmk through environment variables in addition to arguments
- Adds autocompletion for virtual machines that belong to projects
- Uses the Related metadata exposed by API discovery to pick the right list API for autocompletion
- Fixes autocompletion for APIs whose noun ends in 'y', such as snapshot policies
- Fixes a slice bounds panic in autocompletion
- Fixes a nil pointer panic on sync when the management server returns an empty API list
- Fixes filter=count output to avoid emitting empty objects
- Switches to the maintained ergochat/readline library for the interactive shell
- Improves repository automation, licence auditing and security documentation

Testing

• gofmt clean, go build ./... OK, go test ./... passes
• snap/snapcraft.yaml parses; version and source-tag both resolve to 6.6.0
• make all && ./bin/cmk version reports Apache CloudStack 🐵 CloudMonkey 6.6.0

[github-actions]

✅ Build complete for PR #223.

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Pull request overview

Prepares the repository for the 6.6.0 release by updating version identifiers and adding release notes to the changelog.

Changes:

• Bumps the Snap package release tag/version to 6.6.0.
• Updates the CLI reported version from 6.6.0-SNAPSHOT to 6.6.0.
• Adds a new Version 6.6.0 section to CHANGES.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
snap/snapcraft.yaml	Updates the Snap version anchor to 6.6.0 so downstream fields reuse the new tag.
config/about.go	Updates the CLI version string to the final 6.6.0 release value.
CHANGES.md	Adds the 6.6.0 changelog section at the top of the file.

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