feat(#2089): additive claude.md pointer to in-container docs

hive-ag3nt/prompts/docs-pointer.md

@@ -0,0 +1,19 @@
+# hyperhive reference docs
+
+The hyperhive reference docs are mounted read-only in this directory
+(the harness exposes the path as `$HIVE_DOCS_DIR`). They are the
+canonical reference for how this swarm actually works - the turn loop,
+the tool surface, persistence, conventions, runbooks, and the
+approval/CI/forge/matrix workflows.
+
+- On a fresh deploy, or any time you are unsure how a hyperhive
+  mechanism behaves, read `setup.md` first, then the topic file for the
+  area you are touching (e.g. `turn-loop.md`, `persistence.md`,
+  `tools/`, `conventions.md`, `gotchas.md`).
+- Prefer these docs over guessing: they describe the live system, not a
+  generic one.
+
+This pointer is additive. It does not replace your own memory or project
+instructions - your `~/.claude/CLAUDE.md` and any harness/project memory
+still apply in full. Nothing here overrides what you already know about
+yourself; it only tells you where the shared reference material lives.