content: four concept pages tagged guideline; the template's guideline filter is a default, not a setup question (#179)

Files changed:
- CHANGES.md
- VERSION
- kb/CONVENTIONS.md
- kb/CONVENTIONS.md.template
- kb/concepts/decisions/Diff-Reviewable Agent Edits.md
- kb/concepts/decisions/Structural Enforcement over Documented Rule.md
- kb/concepts/problems/Ambient Environment Dependency.md
- kb/concepts/problems/Green Suite Blind Spot.md
- kb/log.md

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

kb/CONVENTIONS.md

@@ -151,7 +151,7 @@ is written down here and nowhere else.
 **The filter is `--tag guideline`.** A page carries the tag when its content is a rule an agent
 working in another repository should follow there as it stands - written so that it reads without
 its links and citations, because the export turns `[[links]]` into plain text and drops every
-footnote. No page in this corpus carries it yet.
+footnote. `tools/wikitool search --tag guideline` lists the pages that carry it.
 
 ## Keeping this file honest