Add AI indicator pre-commit guard

.config/git-hooks/commit-msg

@@ -0,0 +1,118 @@
+#!/usr/bin/env bash
+
+# Guard commit messages against explicit AI usage indicators.
+# The script rejects messages containing phrases that suggest the text
+# was generated by an AI assistant or tool (as defined in onboarding docs).
+
+set -euo pipefail
+
+MSG_FILE=${1:?}
+
+# Patterns to block; all matches are case-insensitive (grep -i).
+declare -a PATTERNS=(
+  "generated by cursor"
+  "cursor ai"
+  "cursor wrote this"
+  "cursor suggestion"
+  "generated by claude"
+  "claude wrote this"
+  "claude ai"
+  "claude opus"
+  "claude sonnet"
+  "claude haiku"
+  "claude code"
+  "generated with claude code"
+  "generated with \\[claude code\\]"
+  "co-authored-by: claude"
+  "noreply@anthropic\\.com"
+  "generated by gemini"
+  "gemini wrote this"
+  "google gemini"
+  "gemini ultra"
+  "gemini pro"
+  "gemini nano"
+  "generated by bard"
+  "bard wrote this"
+  "google bard"
+  "as an ai assistant"
+  "as an ai"
+  "ai assistant"
+  "ai suggestion"
+  "ai suggestions"
+  "ai-generated"
+  "ai generated"
+  "ai-assisted"
+  "ai assisted"
+  "ai-powered"
+  "ai powered"
+  "powered by ai"
+  "with ai assistance"
+  "with the help of ai"
+  "assisted by ai"
+  "written with ai"
+  "written by ai"
+  "generated with ai"
+  "generated via ai"
+  "created with ai"
+  "created by ai"
+  "authored by ai"
+  "co-authored by ai"
+  "ai help"
+  "ai helped"
+  "ai copilot"
+  "ai co-pilot"
+  "chatgpt"
+  "gpt-4"
+  "gpt4"
+  "gpt-3"
+  "gpt3"
+  "openai"
+  "anthropic"
+  "google ai"
+  "google deepmind"
+  "deepmind"
+  "perplexity"
+  "perplexity ai"
+  "tabnine"
+  "tabnine ai"
+  "replit ghostwriter"
+  "ghostwriter ai"
+  "aws codewhisperer"
+  "amazon codewhisperer"
+  "code whisperer"
+  "codewhisperer"
+  "github copilot"
+  "copilot"
+  "amazon q"
+  "amazon q developer"
+  "meta ai"
+  "deepseek"
+  "phind"
+  "blackbox ai"
+  "magic ai"
+  "ai model"
+  "llm"
+  "large language model"
+  "language model"
+  "\\[ai\\]"
+  "\\[ai-generated\\]"
+  "\\[cursor\\]"
+  "\\[claude\\]"
+  "\\[gemini\\]"
+  "\\[copilot\\]"
+  "\\[chatgpt\\]"
+  "\\[llm\\]"
+)
+
+for pattern in "${PATTERNS[@]}"; do
+  if LC_ALL=C grep -qiE "$pattern" "$MSG_FILE"; then
+    cat >&2 <<EOF
+✖ Commit message blocked: found AI indicator "$pattern".
+
+Please rewrite the message without explicitly referencing AI tools or prompts.
+EOF
+    exit 1
+  fi
+done
+
+exit 0