chore: remove release-drafter, document release process

[skyoo2003]

Summary

Remove the redundant release-drafter config/workflow and document the actual Changie + GoReleaser release process.

Related Issue

Fixes #

Changes

• Remove .github/release-drafter.yml and .github/workflows/release-drafter.yml — release notes are owned by Changie fragments (changes/<tag>.md) and consumed by GoReleaser at tag time, so release-drafter was dead/parallel tooling.
• Add docs/release.md — Changie fragment → changie batch/merge → tag push → GoReleaser flow, dry-run, and the separate CD image pipeline.
• Link it from docs/README.md.
• Fix stale references in CONTRIBUTING.md and .github/pull_request_template.md (they told contributors to hand-edit CHANGELOG.md, which is now generated by changie merge).

Test Plan

• Docs/CI-config only — no runtime code. Removed workflow no longer references a deleted config; remaining links resolve.

Checklist

• Self-reviewed the code
• Added/updated tests — N/A (docs/CI config only)
• Lint/format passes (golangci-lint run) — N/A (no Go changes)
• Updated documentation (if applicable)
• Added a Changie changelog fragment for user-facing changes — N/A (internal tooling/docs only)

[sourcery-ai]

Reviewer's Guide

Removes the unused release-drafter config/workflow and documents the actual Changie + GoReleaser-based release process, updating contributor docs and templates to point at Changie fragments instead of manual CHANGELOG edits.

File-Level Changes

Change	Details	Files
Remove legacy release-drafter automation in favor of the existing Changie + GoReleaser release tooling.	Delete the release-drafter configuration file from the GitHub metadata. Delete the release-drafter GitHub Actions workflow so it no longer runs in CI.	.github/release-drafter.yml .github/workflows/release-drafter.yml
Add and surface a dedicated release process document describing the Changie and GoReleaser workflows.	Introduce a new release guide covering versioning, fragment creation, batching/merging, tagging, CI release behavior, and dry-run support. Link the new release guide from the docs index under the contributing section.	docs/release.md docs/README.md
Align contributor guidance and PR checklist with the Changie-based release note generation flow.	Update contributor docs to remove references to release-drafter and clarify that release notes come from Changie fragments, including how to add them. Update the pull request template checklist to require a Changie fragment for user-facing changes instead of manual CHANGELOG edits.	CONTRIBUTING.md .github/pull_request_template.md

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