diff --git a/.claude-plugins/projman-marketplace/.claude-plugin/marketplace.json b/.claude-plugins/projman-marketplace/.claude-plugin/marketplace.json
index 0d72a75..21c86a6 100644
--- a/.claude-plugins/projman-marketplace/.claude-plugin/marketplace.json
+++ b/.claude-plugins/projman-marketplace/.claude-plugin/marketplace.json
@@ -10,6 +10,12 @@
       "version": "0.1.0",
       "description": "Sprint planning and project management with Gitea and Wiki.js integration",
       "source": "./../../projman"
+    },
+    {
+      "name": "project-hygiene",
+      "version": "0.1.0",
+      "description": "Post-task cleanup hook that removes temp files, warns about unexpected root files, and manages orphans",
+      "source": "./../../project-hygiene"
     }
   ]
 }
diff --git a/README.md b/README.md
index e69de29..76fc4f9 100644
Binary files a/README.md and b/README.md differ
diff --git a/project-hygiene/.claude-plugin/plugin.json b/project-hygiene/.claude-plugin/plugin.json
new file mode 100644
index 0000000..90f5088
--- /dev/null
+++ b/project-hygiene/.claude-plugin/plugin.json
@@ -0,0 +1,22 @@
+{
+  "name": "project-hygiene",
+  "version": "0.1.0",
+  "description": "Post-task cleanup hook that removes temp files, warns about unexpected root files, and manages orphaned supporting files",
+  "author": {
+    "name": "Bandit Labs",
+    "email": "dev@banditlabs.io"
+  },
+  "license": "MIT",
+  "keywords": ["cleanup", "hygiene", "automation", "hooks", "maintenance"],
+  "repository": "https://github.com/bandit-labs/project-hygiene",
+  "config": {
+    "default_shell": "bash",
+    "environment": {
+      "PLUGIN_HOME": "${CLAUDE_PLUGIN_ROOT}"
+    }
+  },
+  "permissions": {
+    "file_access": ["read", "write"],
+    "shell_access": true
+  }
+}
diff --git a/project-hygiene/README.md b/project-hygiene/README.md
new file mode 100644
index 0000000..abf5a5b
--- /dev/null
+++ b/project-hygiene/README.md
@@ -0,0 +1,135 @@
+# project-hygiene
+
+Post-task cleanup hook plugin for Claude Code. Automatically cleans up temporary files, warns about unexpected files in the project root, and manages orphaned supporting files after task completion.
+
+## Features
+
+- **Delete temp files**: Removes `*.tmp`, `*.bak`, `__pycache__`, `.pytest_cache`, and other common temporary patterns
+- **Root file warnings**: Alerts when unexpected files appear in project root
+- **Orphan detection**: Identifies `test_*`, `debug_*`, `*_backup.*` and similar files that may have been left behind
+- **Cleanup logging**: Records all actions to `.dev/logs/`
+- **Configurable**: Project-local `.hygiene.json` for custom rules
+
+## Installation
+
+Add to your Claude Code configuration or install from the marketplace:
+
+```bash
+claude plugin install project-hygiene
+```
+
+## How It Works
+
+The plugin registers a `task-completed` hook that runs after Claude completes any task. It:
+
+1. Scans for and deletes known temporary file patterns
+2. Removes temporary directories (`__pycache__`, `.pytest_cache`, etc.)
+3. Checks for unexpected files in project root and warns
+4. Identifies orphaned supporting files (test files, debug scripts, backups)
+5. Optionally moves orphans to `.dev/scratch/` for review
+6. Logs all actions to `.dev/logs/hygiene-TIMESTAMP.log`
+
+## Configuration
+
+Create `.hygiene.json` in your project root to customize behavior:
+
+```json
+{
+  "move_orphans": true,
+  "allowed_root_files": [
+    "custom-config.yaml",
+    "my-script.sh"
+  ],
+  "temp_patterns": [
+    "*.cache",
+    "*.pid"
+  ],
+  "ignore_patterns": [
+    "important_test_*.py",
+    "keep_this_backup.*"
+  ]
+}
+```
+
+### Options
+
+| Option | Type | Default | Description |
+|--------|------|---------|-------------|
+| `move_orphans` | boolean | `false` | Move orphaned files to `.dev/scratch/` instead of just warning |
+| `allowed_root_files` | array | (see below) | Additional files allowed in project root |
+| `temp_patterns` | array | `[]` | Additional temp file patterns to delete |
+| `ignore_patterns` | array | `[]` | Files to never touch during cleanup |
+
+### Default Allowed Root Files
+
+The plugin recognizes common project files in root:
+- Git files: `.git`, `.gitignore`, `.gitattributes`
+- Config: `.editorconfig`, `.env*`, `.nvmrc`, etc.
+- Documentation: `README.md`, `LICENSE`, `CHANGELOG.md`, `CLAUDE.md`
+- Package managers: `package.json`, `requirements.txt`, `Cargo.toml`, `go.mod`, etc.
+- Build configs: `Makefile`, `Dockerfile`, `docker-compose.yml`, `tsconfig.json`, etc.
+
+### Default Temp Patterns
+
+Automatically cleaned:
+- `*.tmp`, `*.bak`, `*.swp`, `*.swo`, `*~`
+- `.DS_Store`, `Thumbs.db`
+- `*.log`, `*.orig`, `*.pyc`, `*.pyo`
+
+### Default Temp Directories
+
+Automatically removed:
+- `__pycache__`, `.pytest_cache`, `.mypy_cache`, `.ruff_cache`
+- `node_modules/.cache`, `.next/cache`, `.nuxt/.cache`, `.turbo`
+- `*.egg-info`, `.eggs`
+
+### Orphan Patterns
+
+Files flagged as orphans:
+- `test_*.py` (standalone test files)
+- `debug_*` (debug scripts)
+- `*_backup.*`, `*_old.*`, `*_bak.*`, `*.backup`
+- `temp_*`, `tmp_*`
+
+## Output
+
+After each task, you'll see output like:
+
+```
+[14:32:15] Starting project hygiene cleanup...
+
+[14:32:15] Cleaning temp files...
+[14:32:15]   DELETED: ./src/__pycache__/utils.cpython-311.pyc
+[14:32:15]   DELETED: ./temp.bak
+
+[14:32:15] Cleaning temp directories...
+[14:32:15]   DELETED DIR: ./src/__pycache__
+
+[14:32:15] Checking root files...
+[14:32:15]   WARNING: Unexpected root file: random_notes.txt
+
+[14:32:15] Checking for orphaned files...
+[14:32:15]   ORPHAN: ./test_scratch.py
+[14:32:15]   ORPHAN: ./debug_api.py
+
+=== Cleanup Summary ===
+  Deleted: 3 items
+  Warnings: 1 unexpected root files
+  Orphans: 2 files
+  Log file: .dev/logs/hygiene-20250110-143215.log
+```
+
+## Directory Structure
+
+```
+.dev/
+├── logs/
+│   └── hygiene-YYYYMMDD-HHMMSS.log
+└── scratch/        # (if move_orphans enabled)
+    └── debug_api.py
+```
+
+## Requirements
+
+- Bash 4.0+
+- Optional: `jq` for JSON config parsing (falls back to defaults if not installed)
diff --git a/project-hygiene/hooks/cleanup.sh b/project-hygiene/hooks/cleanup.sh
new file mode 100755
index 0000000..5206948
--- /dev/null
+++ b/project-hygiene/hooks/cleanup.sh
@@ -0,0 +1,365 @@
+#!/bin/bash
+# project-hygiene cleanup hook
+# Runs after task completion to clean up temp files and manage orphans
+
+set -euo pipefail
+
+# Configuration
+PROJECT_ROOT="${PROJECT_ROOT:-.}"
+PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(dirname "$(dirname "$(realpath "$0")")")}"
+CONFIG_FILE="${PROJECT_ROOT}/.hygiene.json"
+LOG_DIR="${PROJECT_ROOT}/.dev/logs"
+SCRATCH_DIR="${PROJECT_ROOT}/.dev/scratch"
+LOG_FILE="${LOG_DIR}/hygiene-$(date +%Y%m%d-%H%M%S).log"
+
+# Default allowed root files (can be overridden by .hygiene.json)
+DEFAULT_ALLOWED_ROOT=(
+    ".git"
+    ".gitignore"
+    ".gitattributes"
+    ".editorconfig"
+    ".env"
+    ".env.example"
+    ".env.local"
+    ".nvmrc"
+    ".node-version"
+    ".python-version"
+    ".ruby-version"
+    ".tool-versions"
+    "README.md"
+    "LICENSE"
+    "CHANGELOG.md"
+    "CONTRIBUTING.md"
+    "CLAUDE.md"
+    "package.json"
+    "package-lock.json"
+    "yarn.lock"
+    "pnpm-lock.yaml"
+    "Makefile"
+    "Dockerfile"
+    "docker-compose.yml"
+    "docker-compose.yaml"
+    "Cargo.toml"
+    "Cargo.lock"
+    "go.mod"
+    "go.sum"
+    "requirements.txt"
+    "setup.py"
+    "pyproject.toml"
+    "poetry.lock"
+    "Gemfile"
+    "Gemfile.lock"
+    "tsconfig.json"
+    "jsconfig.json"
+    ".eslintrc*"
+    ".prettierrc*"
+    "vite.config.*"
+    "webpack.config.*"
+    "rollup.config.*"
+    ".hygiene.json"
+)
+
+# Temp file patterns to delete
+TEMP_PATTERNS=(
+    "*.tmp"
+    "*.bak"
+    "*.swp"
+    "*.swo"
+    "*~"
+    ".DS_Store"
+    "Thumbs.db"
+    "*.log"
+    "*.orig"
+    "*.pyc"
+    "*.pyo"
+)
+
+# Directory patterns to delete
+TEMP_DIRS=(
+    "__pycache__"
+    ".pytest_cache"
+    ".mypy_cache"
+    ".ruff_cache"
+    "node_modules/.cache"
+    ".next/cache"
+    ".nuxt/.cache"
+    ".turbo"
+    "*.egg-info"
+    ".eggs"
+    "dist"
+    "build"
+)
+
+# Orphan patterns to identify
+ORPHAN_PATTERNS=(
+    "test_*.py"
+    "debug_*"
+    "*_backup.*"
+    "*_old.*"
+    "*_bak.*"
+    "*.backup"
+    "temp_*"
+    "tmp_*"
+)
+
+# Initialize
+DELETED_COUNT=0
+WARNED_COUNT=0
+ORPHAN_COUNT=0
+MOVE_ORPHANS=false
+
+# Logging function
+log() {
+    local msg="[$(date +%H:%M:%S)] $1"
+    echo "$msg"
+    if [[ -f "$LOG_FILE" ]]; then
+        echo "$msg" >> "$LOG_FILE"
+    fi
+}
+
+log_action() {
+    local action="$1"
+    local target="$2"
+    log "  $action: $target"
+}
+
+# Load project-local config if exists
+load_config() {
+    if [[ -f "$CONFIG_FILE" ]]; then
+        log "Loading config from $CONFIG_FILE"
+
+        # Check if move_orphans is enabled
+        if command -v jq &>/dev/null; then
+            MOVE_ORPHANS=$(jq -r '.move_orphans // false' "$CONFIG_FILE" 2>/dev/null || echo "false")
+
+            # Load additional allowed root files
+            local extra_allowed
+            extra_allowed=$(jq -r '.allowed_root_files // [] | .[]' "$CONFIG_FILE" 2>/dev/null || true)
+            if [[ -n "$extra_allowed" ]]; then
+                while IFS= read -r file; do
+                    DEFAULT_ALLOWED_ROOT+=("$file")
+                done <<< "$extra_allowed"
+            fi
+
+            # Load additional temp patterns
+            local extra_temp
+            extra_temp=$(jq -r '.temp_patterns // [] | .[]' "$CONFIG_FILE" 2>/dev/null || true)
+            if [[ -n "$extra_temp" ]]; then
+                while IFS= read -r pattern; do
+                    TEMP_PATTERNS+=("$pattern")
+                done <<< "$extra_temp"
+            fi
+
+            # Load ignore patterns (files to never touch)
+            IGNORE_PATTERNS=()
+            local ignore
+            ignore=$(jq -r '.ignore_patterns // [] | .[]' "$CONFIG_FILE" 2>/dev/null || true)
+            if [[ -n "$ignore" ]]; then
+                while IFS= read -r pattern; do
+                    IGNORE_PATTERNS+=("$pattern")
+                done <<< "$ignore"
+            fi
+        else
+            log "Warning: jq not installed, using default config"
+        fi
+    fi
+}
+
+# Check if file should be ignored
+should_ignore() {
+    local file="$1"
+    local basename
+    basename=$(basename "$file")
+
+    for pattern in "${IGNORE_PATTERNS[@]:-}"; do
+        if [[ "$basename" == $pattern ]] || [[ "$file" == $pattern ]]; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+# Check if file is in allowed root list
+is_allowed_root() {
+    local file="$1"
+    local basename
+    basename=$(basename "$file")
+
+    for allowed in "${DEFAULT_ALLOWED_ROOT[@]}"; do
+        # Support wildcards in allowed patterns
+        if [[ "$basename" == $allowed ]]; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+# Check if file matches orphan pattern
+is_orphan() {
+    local file="$1"
+    local basename
+    basename=$(basename "$file")
+
+    for pattern in "${ORPHAN_PATTERNS[@]}"; do
+        if [[ "$basename" == $pattern ]]; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+# Setup directories
+setup_dirs() {
+    mkdir -p "$LOG_DIR"
+    if [[ "$MOVE_ORPHANS" == "true" ]]; then
+        mkdir -p "$SCRATCH_DIR"
+    fi
+
+    # Start log file
+    echo "=== Project Hygiene Cleanup ===" > "$LOG_FILE"
+    echo "Started: $(date)" >> "$LOG_FILE"
+    echo "Project: $PROJECT_ROOT" >> "$LOG_FILE"
+    echo "" >> "$LOG_FILE"
+}
+
+# Delete temp files
+cleanup_temp_files() {
+    log "Cleaning temp files..."
+
+    for pattern in "${TEMP_PATTERNS[@]}"; do
+        while IFS= read -r -d '' file; do
+            if should_ignore "$file"; then
+                continue
+            fi
+            rm -f "$file"
+            log_action "DELETED" "$file"
+            ((DELETED_COUNT++))
+        done < <(find "$PROJECT_ROOT" -name "$pattern" -type f -print0 2>/dev/null || true)
+    done
+}
+
+# Delete temp directories
+cleanup_temp_dirs() {
+    log "Cleaning temp directories..."
+
+    for pattern in "${TEMP_DIRS[@]}"; do
+        while IFS= read -r -d '' dir; do
+            if should_ignore "$dir"; then
+                continue
+            fi
+            rm -rf "$dir"
+            log_action "DELETED DIR" "$dir"
+            ((DELETED_COUNT++))
+        done < <(find "$PROJECT_ROOT" -name "$pattern" -type d -print0 2>/dev/null || true)
+    done
+}
+
+# Warn about unexpected root files
+check_root_files() {
+    log "Checking root files..."
+
+    local unexpected_files=()
+
+    while IFS= read -r -d '' file; do
+        local basename
+        basename=$(basename "$file")
+
+        # Skip directories
+        [[ -d "$file" ]] && continue
+
+        # Skip if in allowed list
+        is_allowed_root "$basename" && continue
+
+        # Skip if should be ignored
+        should_ignore "$basename" && continue
+
+        unexpected_files+=("$basename")
+        log_action "WARNING" "Unexpected root file: $basename"
+        ((WARNED_COUNT++))
+    done < <(find "$PROJECT_ROOT" -maxdepth 1 -print0 2>/dev/null || true)
+
+    if [[ ${#unexpected_files[@]} -gt 0 ]]; then
+        log ""
+        log "⚠️  Unexpected files in project root:"
+        for f in "${unexpected_files[@]}"; do
+            log "    - $f"
+        done
+    fi
+}
+
+# Identify and handle orphaned files
+handle_orphans() {
+    log "Checking for orphaned files..."
+
+    local orphan_files=()
+
+    for pattern in "${ORPHAN_PATTERNS[@]}"; do
+        while IFS= read -r -d '' file; do
+            if should_ignore "$file"; then
+                continue
+            fi
+
+            orphan_files+=("$file")
+
+            if [[ "$MOVE_ORPHANS" == "true" ]]; then
+                local dest="${SCRATCH_DIR}/$(basename "$file")"
+                # Handle duplicates
+                if [[ -f "$dest" ]]; then
+                    dest="${SCRATCH_DIR}/$(date +%Y%m%d%H%M%S)_$(basename "$file")"
+                fi
+                mv "$file" "$dest"
+                log_action "MOVED" "$file -> $dest"
+            else
+                log_action "ORPHAN" "$file"
+            fi
+            ((ORPHAN_COUNT++))
+        done < <(find "$PROJECT_ROOT" -name "$pattern" -type f -print0 2>/dev/null || true)
+    done
+
+    if [[ ${#orphan_files[@]} -gt 0 && "$MOVE_ORPHANS" != "true" ]]; then
+        log ""
+        log "📦 Orphaned files found (enable move_orphans in .hygiene.json to auto-move):"
+        for f in "${orphan_files[@]}"; do
+            log "    - $f"
+        done
+    fi
+}
+
+# Summary
+print_summary() {
+    log ""
+    log "=== Cleanup Summary ==="
+    log "  Deleted: $DELETED_COUNT items"
+    log "  Warnings: $WARNED_COUNT unexpected root files"
+    log "  Orphans: $ORPHAN_COUNT files"
+    if [[ "$MOVE_ORPHANS" == "true" ]]; then
+        log "  Orphans moved to: $SCRATCH_DIR"
+    fi
+    log "  Log file: $LOG_FILE"
+    log ""
+}
+
+# Main
+main() {
+    cd "$PROJECT_ROOT" || exit 1
+
+    load_config
+    setup_dirs
+
+    log "Starting project hygiene cleanup..."
+    log ""
+
+    cleanup_temp_files
+    cleanup_temp_dirs
+    check_root_files
+    handle_orphans
+
+    print_summary
+
+    # Exit with warning code if issues found
+    if [[ $WARNED_COUNT -gt 0 || $ORPHAN_COUNT -gt 0 ]]; then
+        exit 0  # Still success, but logged warnings
+    fi
+}
+
+main "$@"
diff --git a/project-hygiene/hooks/hooks.json b/project-hygiene/hooks/hooks.json
new file mode 100644
index 0000000..7d922f1
--- /dev/null
+++ b/project-hygiene/hooks/hooks.json
@@ -0,0 +1,9 @@
+{
+  "hooks": [
+    {
+      "event": "task-completed",
+      "script": "${CLAUDE_PLUGIN_ROOT}/hooks/cleanup.sh",
+      "description": "Post-task cleanup: remove temp files, warn about unexpected root files, manage orphans"
+    }
+  ]
+}