Add interactive multi-repo batch mode

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Summary

Add a commit-echo batch <directory> command that scans a directory for git repositories, identifies those with staged changes, and processes each one in sequence — generating suggestions, committing, and reporting results.

Motivation

• Common in monorepo setups or when managing multiple microservices
• Developers often switch between several repos in a working session
• Batch mode saves time by automating the context-switch workflow

Proposed Implementation

1. Add a new batch subcommand in src/commands/batch.ts
2. The command takes a directory path argument (default: current directory)
3. Scan for directories containing a .git folder (non-recursive by default, with a --recursive flag)
4. For each repo with staged changes:
   • Print repo name/path
   • Generate suggestions (reuse generateSuggestions from src/llm/client.ts)
   • Display suggestions
   • Auto-commit or prompt per-repo based on a --yes flag
5. Print a summary report at the end showing which repos succeeded/failed

Acceptance Criteria

• commit-echo batch ./projects finds all git repos in ./projects
• Processes repos with staged changes in sequence
• Supports --yes for unattended batch operation
• Prints clear summary of results per repo
• Skips repos without staged changes with a notice