The strip_md_suffix function was removed but its usages remained,
causing lookups like `identity.md` to fail (stripped to `identity`
which didn't exist). Now keys are used as-is.
Renamed 4 nodes that had .md suffixes to canonical form:
- identity.md → identity
- promotion-work-queue.md-* → promotion-work-queue-*
- patterns.md#* → patterns-*
- practices.md#* → practices-*
Co-Authored-By: Proof of Concept <poc@bcachefs.org>
e8462af505