fix(hooks): plain text output only, no JSON injection

Skills-dir plugins might not process hookSpecificOutput JSON.
Revert to simple plain text echo - no emoji, no JSON, no Python.
Hook just prints detection results as clean text.

hooks/scripts/detect-project.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# hub-guide: detect project and prime skills at session start
+# hub-guide: detect project type and prime best-practice skills
 set -euo pipefail
 
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
@@ -41,50 +41,9 @@ fi
 MANDATORY="engineering-principles clean-code clean-architecture testing error-handling security git-workflow api-design"
 SKILL_NAMES="${SKILL_NAMES#, }"
 
-# --- build minimal context injection via Python ---
+# --- output: plain text only, no emoji, no JSON ---
-python3 << PYEOF
+echo "[hub-guide] detected: ${PROJECT_DIR}"
-import json, os, sys
+echo "[hub-guide] mandatory: ${MANDATORY}"
-
+if [ -n "$SKILL_NAMES" ]; then
-project_dir = """${PROJECT_DIR}"""
+  echo "[hub-guide] active: ${SKILL_NAMES}"
-mandatory = """${MANDATORY}"""
+fi
-skill_names = """${SKILL_NAMES}"""
-plugin_root = """${PLUGIN_ROOT}"""
-
-# Read just the foundational skill (engineering-principles) as the primer
-foundational_skill = ""
-f_path = os.path.join(plugin_root, "skills", "engineering-principles", "SKILL.md")
-try:
-    with open(f_path) as f:
-        foundational_skill = f.read()
-except:
-    foundational_skill = "(engineering-principles skill not found)"
-
-context = f"""<EXTREMELY_IMPORTANT>
-You have the hub-guide best-practice skills loaded.
-
-=== MANDATORY (always active) ===
-{mandatory}
-
-=== FOUNDATIONAL ===
-{foundational_skill}
-
-=== PROJECT-SPECIFIC ===
-{skill_names if skill_names else "(none detected)"}
-
-Use the Skill tool for any other hub-guide skill when its topic comes up.
-Never assume or guess. Always find evidence in the codebase or docs.
-</EXTREMELY_IMPORTANT>"""
-
-if os.environ.get("CLAUDE_PLUGIN_ROOT") and not os.environ.get("COPILOT_CLI"):
-    output = {
-        "hookSpecificOutput": {
-            "hookEventName": "SessionStart",
-            "additionalContext": context
-        }
-    }
-    json.dump(output, sys.stdout, ensure_ascii=False)
-    print()
-else:
-    print("hub-guide skills: " + ", ".join([m for m in mandatory.split()] + ([skill_names] if skill_names else [])))
-PYEOF
-exit 0