feat(hooks): detect from prompt not files

- Replace command-based SessionStart/PreToolUse hooks with prompt-based Stop hook
- Stop hook reads user's prompt and activates relevant skills concept-based
- Remove obsolete detect-project.sh, detect-file-type.sh, setup-hooks.sh
- Detection is concept-based regardless of spoken language

hooks/scripts/detect-file-type.sh

@@ -1,19 +0,0 @@
-#!/bin/bash
-# hub-guide: detect file extension from tool input and suggest language-specific rules
-# Runs before Write/Edit to inject best-practice context
-
-TOOL_INPUT="$1"
-
-# Extract file path from tool input (looks for "file_path" in JSON)
-FILE_PATH=$(echo "$TOOL_INPUT" | grep -o '"file_path"[[:space:]]*:[[:space:]]*"[^"]*"' | head -1 | sed 's/.*"file_path"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/')
-EXT="${FILE_PATH##*.}"
-
-case "$EXT" in
-  ts|tsx)   echo "📐 .${EXT} → typescript:strict" ;;
-  py)       echo "📐 .py → python:strict" ;;
-  rs)       echo "📐 .rs → rust:strict" ;;
-  go)       echo "📐 .go → go:strict" ;;
-  js|jsx)   echo "📐 .${EXT} → typescript:esm" ;;
-  Dockerfile|dockerfile) echo "📐 Dockerfile → docker:minimal" ;;
-  yml|yaml) echo "📐 .${EXT} → ci-cd+docker" ;;
-esac