feat(ingest): Clarify Python3 dependency and agent sorting roles

lib/deps.sh

@@ -27,6 +27,10 @@ check_deps() {
   if ! command -v bw &>/dev/null; then
     warn "Optional tool 'bw' (Bitwarden CLI) not found. Vaultwarden integration will be manual."
   fi
+
+  if ! command -v python3 &>/dev/null; then
+    warn "Optional tool 'python3' not found. Needed for 'make test' and the ingest skill (index-append.py), not for setup."
+  fi
 }
 
 check_git_identity() {

templates/agents-genome.md

@@ -179,7 +179,7 @@ Append at bottom of relevant section in `wiki/index.md`:
 - [[folder/slug]] — One-line summary. `maturity: draft`
 ```
 
-Never reorder. Alphabetical sort is handled by the pre-commit hook.
+Never reorder. Alphabetical sorting is handled by the post-processor (index-append.py); the pre-commit hook only enforces the security policy.
 
 ### Log entries
 

templates/wiki-index.md

@@ -12,9 +12,9 @@ private: false
 **[AGENT INSTRUCTION]**
 This is the primary navigation file. Read it first on every session before accessing individual pages.
 Append new entries at the bottom of the relevant section — do not reorder or rewrite sections.
-Alphabetical sorting is handled automatically by the pre-commit hook.
+Alphabetical sorting is handled by the post-processor (index-append.py); the pre-commit hook only enforces the security policy.
 Update `last_updated` in the YAML frontmatter on every edit.
-Entry format: `- [[folder/slug]] — One-line summary. \`maturity: <value>\``
+Entry format: `- [[folder/slug]] — One-line summary. \`maturity: &lt;value&gt;\``
 
 ---