feat: add kimchi history subcommand

[igor-susic1]

Adds a new "kimchi history" subcommand that lets users browse and resume previous local chat/development sessions.

• Implements "src/commands/history.ts" with runHistory() and getHistoryHelp()
• Parses --help/-h and --limit flags (default 20, max 100)
• Lists sessions via SessionManager.list(process.cwd()), sorted by modified descending
• Interactive @clack/prompts select when stdin is a TTY; prints a numbered list otherwise
• Spawns the current executable with --session and forwards SIGINT/SIGTERM/SIGHUP
• Handles empty history, cancellation (exit 130), and errors gracefully
• Registers the command in src/commands/registry.ts and updates src/commands/help.ts
• Adds src/commands/history.test.ts with 15 vitest tests

Verification:

• pnpm run lint ✅
• pnpm run typecheck ✅
• pnpm run test src/commands/history.test.ts ✅ (15/15)
• pnpm run test src/commands/dispatch.test.ts src/commands/update.test.ts ✅ (25/25)