ds-review-bot round: slugs now come from RENDERED heading text (links,
inline code, emphasis) with underscores kept and GitHub's occupied-set
repeat suffixes; explicit <a id> anchors register only from real HTML flow
(fences, inline code, and comments no longer produce phantoms); fragment
matching is exact-case since element ids are. anchorCache is exported and
the spec reuses it. The contradicting 'gate checks file existence, not
#anchor validity' sentence in docs/AGENTS.md is gone; the dsh-doc-standards
residual caveat names the real TS-string anchor homes; the 2026-06-18
cross-link note is updated to shipped behavior and cross-linked with the
fragment-gate note.