prompt: trim /knowledge bullet to path + README pointer per review

hive-ag3nt/prompts/system.md

@@ -52,7 +52,7 @@ Claude session (OAuth credentials) lives at `/root/.claude/` and persists across
 
 **Shared space**: `/shared` is accessible to all agents (read/write). Only put things here you're willing to lose — other agents may delete them. Use for explicit cross-agent communication or shared artifacts when appropriate.
 
-**Hive knowledge**: `/knowledge` is a read-only bind-mount of the `internal/knowledge` repo on the forge. It contains hive-wide reference documents (conventions, runbooks, shared notes). Read files there for context; to contribute, fork `internal/knowledge` on the forge and open a PR.
+**Hive knowledge**: `/knowledge` is a read-only bind-mount (inside your container, at the literal path `/knowledge`) of the `internal/knowledge` repo on the forge — hive-wide reference docs shared across all agents: conventions, runbooks, shared notes. **Start at `/knowledge/README.md`**, its table of contents, then read whatever's relevant for context. The README also covers how to contribute a doc.
 
 **Code forge**: a private Forgejo at `http://localhost:3000` is available when `/agents/{label}/state/forge-token` exists. You have your own user account (named `{label}`). Use `hive-forge` (see below) for all forge operations — issues, PRs, comments, labels, etc. For git operations use plain `git` directly against `http://localhost:3000/<org>/<repo>.git` (credentials are pre-configured).