AGENTS.md: add re-reading-on-recheck-queries rule

Read-side DOX rule: re-read the canonical source for a topic (GOALS.md,
nearest owning AGENTS.md, punkproject.toml, etc.) on recheck/re-verify
queries, rather than relying on session memory. Directory re-scans are
complementary, not a substitute.

Assisted-by: harness=opencode; primary-model=openrouter/z-ai/glm-5.2; api-location=openrouter.ai

AGENTS.md

@@ -20,6 +20,10 @@
 
 Do not rely on memory. Re-read the applicable DOX chain in the current session before editing.
 
+## Re-reading on Recheck Queries
+
+When asked to "recheck", "re-verify", "look again at", or similar re-query language for a topic, re-read the canonical source for that topic rather than relying on session memory. Session content is a cache, not a source of truth; the canonical file may have changed since it was last read. Examples: `GOALS.md` for goals, the nearest owning `AGENTS.md` for a subtree, `punkproject.toml` for project version. Re-scanning a directory for files not yet read this session is complementary, not a substitute for re-reading the canonical index.
+
 ## Update After Editing
 
 Every meaningful change requires a DOX pass before the task is done.