Repo-prefixed changelog bundle output names

[lcawl]

Problem

Per #3856 (comment) the changes to the bundle filename make it more likely for multiple repos to overwrite each others' bundles.

Fix

Profile-mode bundles now use {repo}-{product}-{version}.yaml when a repo can be resolved.

Naming

• Precedence: --repo → profile repo → bundle.repo → git origin (github.com)
• If none of those work: warning and the old {product}-{version}.yaml name
• --plan uses the same helper as the real write, so docs-actions can still trust output_path / cdn_url

Tests cover Kibana-style prefixes, --repo / profile overrides, elastic/kibana → kibana, git origin, and the no-repo warning path. Existing github-release / git-ref / cloud fixture assertions were updated (for example elasticsearch-elasticsearch-9.2.0.yaml when repo and product are both elasticsearch).

Not done here

• docs-actions companion: still need to pass --repo / --owner in profile mode in bundle-create and bundle-fetch (promotion workflow itself does not need a code change): Support repo-prefixed changelog bundle output names docs-actions#316

Tests

Prior to this fix, when I ran a command like this in the kibana repo:

docs-builder changelog bundle serverless-release 2026-08-31 ./docs/temp/prs.txt

... it created a file docs/releases/cloud-serverless-2026-08-31.yaml (which is a filename that could be overwritten by the same command run in any of the other repos that create serverless bundles (e.g. elasticsearch).

With the fix, it creates docs/releases/kibana-cloud-serverless-2026-08-31.yaml

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

2. If you answered "Yes" to the previous question, please specify the tool(s) and model(s) used (e.g., Google Gemini, OpenAI ChatGPT-4, etc.).

Tool(s) and model(s) used: Cursor Grok 4.6

[github-actions]

Docs preview (local build)

Handbook preview: https://docs-v3-preview.elastic.dev/elastic/docs-builder/pull/3984/

Sample changed pages:

• docs/cli/changelog/cmd-bundle.md
• docs/cli/changelog/cmd-upload.md
• docs/data/release-notes/bundle.md
• docs/data/release-notes/configure-ref.md