Stop the root changelog claiming the release maintains it

[vjovanov]

CHANGELOG.md opened by saying the Unreleased section of docs/changelog.md is what "release automation promotes into a numbered section here at release time", citing §FS-rhei-distribution.5.

That section says the promotion happens inside docs/changelog.md, archiving the displaced release under docs/changelog/. It says nothing about this file, and prepare_changelog_release.py never opens it — its --changelog default is docs/changelog.md.

So the file documented a behaviour that has never run, and drifted exactly as far as that implies:

• no 0.2.0, 0.3.0 or 0.3.1 section — it stops at 0.1.0
• an Unreleased note still announcing project-qualified ticket ids as a forthcoming breaking change, eight days after they shipped in 0.2.0

That note is what nearly sent me to a minor bump while cutting 0.3.1; the pending entries were patch-appropriate all along. And CHANGELOG.md ships inside the published crate, so it is the first changelog a reader meets.

The change

The header now says where the changelog actually is and that this file is not maintained by the release. The stale Unreleased note is deleted.

The 0.1.0 section stays, which is the one judgment call here. My first draft replaced the whole file with a pointer; checking before deleting showed docs/changelog/0.1.0.md is a four-line summary, so CHANGELOG.md is the only place the initial release's feature list and its crates.io naming limitation are recorded. Making the file uniform would have quietly lost them.

Verification

grund check output byte-identical to main. No new links introduced — docs/changelog/ is written as inline code, not a directory link, since the repo has no precedent for one and lychee gates links in CI.

Noted, not fixed here: release-plan.md:226 still says to create the GitHub release "from the CHANGELOG.md entry", which the release workflow has not done for some time — it extracts the inline section from docs/changelog.md. That file is explicitly the 0.1.0-era plan, so it wants its own pass.

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