docs: kb/CONTRACT.md names section anchors in wikilinks and the Broken Anchors finding (#172)

Files changed:
- CHANGES.md
- VERSION
- kb/CONTRACT.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

kb/CONTRACT.md

@@ -122,6 +122,15 @@ read a link with a line break in it as a link. `wikitool lint` reports one as a
 Wikilinks* hard error, naming the title it folds to - the graph, `rename` and `rm` already read
 it as that title, so the fix is only to put it back on one line.
 
+**A wikilink may name a section of its page: `[[Title#Section]]`.** The title part is the
+reference - the graph counts it as a link to `Title`, and `rename` carries the anchor along - so
+an anchor never makes a link broken. It can make one stale: a section renamed, or promoted to a
+page of its own ([instructions/page-lifecycle.md](../instructions/page-lifecycle.md)), leaves the
+link reaching the right page and the wrong place. `wikitool lint` reports an anchor that names no
+heading on its page as *Broken Anchors*, advisory - compared at any heading level, without case,
+inline-code backticks or extra whitespace. A section is never a target in `related:`; an edge
+points at a page.
+
 Which *form* those titles take - spaces or kebab-case, singular or plural, what prefixes a
 decision record - is the instance's, in
 [kb/CONVENTIONS.md § Naming](CONVENTIONS.md#naming).