chore(ci): add git-cliff changelog generation

[Raghul-M]

Description

Add automated changelog generation with git-cliff, following the kubeflow/sdk pattern:

• Add cliff.toml configured for kubeflow/mcp-server with conventional commit groups (feat / fix / chore / revert)
• Add CHANGELOG/ with per-minor series files (CHANGELOG-0.1.md for the current 0.1.x line)
• Add make changelog VERSION=X.Y.Z to generate or prepend changelog entries via the git-cliff Docker image

Full release-workflow / on-tag automation remains tracked in #16.

Related Issue

Fixes #59

Checklist

• I have read the CONTRIBUTING guide
• Tests pass locally (make test-python)
• Linting passes (make verify)
• Documentation updated (if applicable)
• My commits are signed off (git commit -s)

Testing

• Unit tests
• Integration tests
• E2E tests
• Manually tested (describe below)

Verified make help exposes the changelog target. Changelog generation can be exercised with:

make changelog VERSION=0.1.0
# optional: GITHUB_TOKEN=... make changelog VERSION=0.1.0

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[github-actions]

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[Copilot]

Pull request overview

Adds git-cliff-based changelog generation for per-minor release series.

Changes:

• Adds conventional commit grouping and GitHub links.
• Adds a Docker-backed make changelog target.
• Initializes the 0.1.x changelog.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
Makefile	Adds changelog generation target.
cliff.toml	Configures changelog formatting and commit groups.
CHANGELOG/CHANGELOG-0.1.md	Initializes the 0.1 series changelog.

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[abhijeet-dhumal]

Thanks @Raghul-M, cliff.toml looks good and matches kubeflow/sdk !

One bug I see .. before /lgtm: CHANGELOG/CHANGELOG-0.1.md already exists as a stub, so the first 'make changelog VERSION=0.1.0' always hits '--prepend' and puts the generated release above the '# Changelog' intro. Either drop the stub and let -o create the file, or treat “no release heading yet” as a create/overwrite path.

@Krishna-kg732 Can you please confirm this fix fits with existing release cadence workflow ?

[Raghul-M]

@abhijeet-dhumal Dropped the stub CHANGELOG/CHANGELOG-0.1.md so the first run can create the file with -o. Makefile now prepends only when a real release heading (# [X.Y.Z]) is already present; otherwise it overwrites/creates with -o. That covers stubs, empty files, and a missing path.

[abhijeet-dhumal]

/ok-to-test