chore: install superpowers skill framework

- Add all 12 skills to .claude/skills/
- Add hooks for session-start bootstrap
- Add CLAUDE.md with using-superpowers bootstrap
- Configure settings.json with SessionStart hooks

.claude/plugins/superpowers/hooks/hooks-cursor.json

@@ -0,0 +1,10 @@
+{
+  "version": 1,
+  "hooks": {
+    "sessionStart": [
+      {
+        "command": "./hooks/run-hook.cmd session-start"
+      }
+    ]
+  }
+}

.claude/plugins/superpowers/hooks/hooks.json

@@ -0,0 +1,17 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|clear|compact",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start",
+            "shell": "bash",
+            "async": false
+          }
+        ]
+      }
+    ]
+  }
+}

.claude/plugins/superpowers/hooks/run-hook.cmd

@@ -0,0 +1,46 @@
+: << 'CMDBLOCK'
+@echo off
+REM Cross-platform polyglot wrapper for hook scripts.
+REM On Windows: cmd.exe runs the batch portion, which finds and calls bash.
+REM On Unix: the shell interprets this as a script (: is a no-op in bash).
+REM
+REM Hook scripts use extensionless filenames (e.g. "session-start" not
+REM "session-start.sh") so Claude Code's Windows auto-detection -- which
+REM prepends "bash" to any command containing .sh -- doesn't interfere.
+REM
+REM Usage: run-hook.cmd <script-name> [args...]
+
+if "%~1"=="" (
+    echo run-hook.cmd: missing script name >&2
+    exit /b 1
+)
+
+set "HOOK_DIR=%~dp0"
+
+REM Try Git for Windows bash in standard locations
+if exist "C:\Program Files\Git\bin\bash.exe" (
+    "C:\Program Files\Git\bin\bash.exe" "%HOOK_DIR%%~1" %2 %3 %4 %5 %6 %7 %8 %9
+    exit /b %ERRORLEVEL%
+)
+if exist "C:\Program Files (x86)\Git\bin\bash.exe" (
+    "C:\Program Files (x86)\Git\bin\bash.exe" "%HOOK_DIR%%~1" %2 %3 %4 %5 %6 %7 %8 %9
+    exit /b %ERRORLEVEL%
+)
+
+REM Try bash on PATH (e.g. user-installed Git Bash, MSYS2, Cygwin)
+where bash >nul 2>nul
+if %ERRORLEVEL% equ 0 (
+    bash "%HOOK_DIR%%~1" %2 %3 %4 %5 %6 %7 %8 %9
+    exit /b %ERRORLEVEL%
+)
+
+REM No bash found - exit silently rather than error
+REM (plugin still works, just without SessionStart context injection)
+exit /b 0
+CMDBLOCK
+
+# Unix: run the named script directly
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SCRIPT_NAME="$1"
+shift
+exec bash "${SCRIPT_DIR}/${SCRIPT_NAME}" "$@"

.claude/plugins/superpowers/hooks/session-start

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+# SessionStart hook for superpowers plugin
+
+set -euo pipefail
+
+# Determine plugin root directory
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PLUGIN_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+# Read using-superpowers content
+using_superpowers_content=$(cat "${PLUGIN_ROOT}/skills/using-superpowers/SKILL.md" 2>&1 || echo "Error reading using-superpowers skill")
+
+# Escape string for JSON embedding using bash parameter substitution.
+# Each ${s//old/new} is a single C-level pass - orders of magnitude
+# faster than the character-by-character loop this replaces.
+escape_for_json() {
+    local s="$1"
+    s="${s//\\/\\\\}"
+    s="${s//\"/\\\"}"
+    s="${s//$'\n'/\\n}"
+    s="${s//$'\r'/\\r}"
+    s="${s//$'\t'/\\t}"
+    printf '%s' "$s"
+}
+
+using_superpowers_escaped=$(escape_for_json "$using_superpowers_content")
+session_context="<EXTREMELY_IMPORTANT>\nYou have superpowers.\n\n**Below is the full content of your 'superpowers:using-superpowers' skill - your introduction to using skills. For all other skills, use the 'Skill' tool:**\n\n${using_superpowers_escaped}\n</EXTREMELY_IMPORTANT>"
+
+# Output context injection as JSON.
+# Cursor hooks expect additional_context (snake_case).
+# Claude Code hooks expect hookSpecificOutput.additionalContext (nested).
+# Copilot CLI (v1.0.11+) and others expect additionalContext (top-level, SDK standard).
+# Claude Code reads BOTH additional_context and hookSpecificOutput without
+# deduplication, so we must emit only the field the current platform consumes.
+#
+# Uses printf instead of heredoc to work around bash 5.3+ heredoc hang.
+# See: https://github.com/obra/superpowers/issues/571
+if [ -n "${CURSOR_PLUGIN_ROOT:-}" ]; then
+  # Cursor sets CURSOR_PLUGIN_ROOT (may also set CLAUDE_PLUGIN_ROOT)
+  printf '{\n  "additional_context": "%s"\n}\n' "$session_context" | cat
+elif [ -n "${CLAUDE_PLUGIN_ROOT:-}" ] && [ -z "${COPILOT_CLI:-}" ]; then
+  # Claude Code sets CLAUDE_PLUGIN_ROOT without COPILOT_CLI
+  printf '{\n  "hookSpecificOutput": {\n    "hookEventName": "SessionStart",\n    "additionalContext": "%s"\n  }\n}\n' "$session_context" | cat
+else
+  # Copilot CLI (sets COPILOT_CLI=1) or unknown platform — SDK standard format
+  printf '{\n  "additionalContext": "%s"\n}\n' "$session_context" | cat
+fi
+
+exit 0