feat(cli): auto-stage when nothing staged for g m/g l/g o; docs: update README

.kiro/steering/product.md

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+# GIMS - Git Made Simple
+
+GIMS is an AI-powered Git CLI tool that automatically generates meaningful commit messages from code changes. It's designed to replace generic commit messages with descriptive, professional ones that tell a story.
+
+## Core Value Proposition
+- Eliminates the need to write commit messages manually
+- Uses AI (OpenAI, Google Gemini, Groq) to analyze code diffs and generate contextual messages
+- Provides a streamlined Git workflow with single-command operations
+- Supports both local and remote operations with intelligent fallbacks
+
+## Key Features
+- AI-powered commit message generation from code diffs
+- One-command workflow: analyze, commit, and push (`g o`)
+- Smart suggestions with clipboard integration (`g s`)
+- Conventional Commits support
+- Numbered commit history and branch management
+- Safe operations with confirmations and dry-run support
+- Graceful fallbacks for large diffs and offline use
+
+## Target Users
+Developers who want to maintain clean Git history without spending time crafting commit messages, especially those working on projects where commit message quality matters for collaboration and code review.