Summary

• Add agentskit run <task> command for non-interactive agent execution
• Plain mode (default): result to stdout, verbose steps to stderr — fully pipeable
• Pretty mode (--pretty): Ink-based rich output with live step/tool progress
• Extract shared resolveTools, resolveSkills, resolveMemory from chat.tsx to resolve.ts
• Flags: --provider, --model, --api-key, --skill, --skills, --tools, --memory, --memory-backend, --system-prompt, --max-steps, --verbose, --pretty, --task
• --skill (single) and --skills (composed) are mutually exclusive
• Task via positional arg or --task flag; exit 1 only on unrecoverable errors

Test plan

• 15 new tests pass: resolveTools, resolveSkill, resolveSkills, resolveMemory, command registration
• 5 existing CLI tests pass with no regressions
• pnpm build succeeds across all packages
• pnpm --filter @agentskit/cli lint passes

Closes #16