feat: kbagent recipe — workflow templates for common multi-step tasks

[padak]

Problem

Complex tasks like "set up a MySQL-to-Snowflake pipeline" require 5-10 coordinated steps. Agents figure this out from `kbagent context` + their own knowledge, but:

• They may miss steps (e.g., forgetting to set up orchestration)
• They don't know common pitfalls (e.g., MULTI_STATEMENT_COUNT for Snowflake)
• Each agent rediscovers the same workflow

Proposal

kbagent recipe list
kbagent recipe show mysql-to-snowflake

Output: structured workflow plan:

• Ordered steps with exact commands
• Required parameters per step
• Common pitfalls and how to avoid them
• Estimated duration
• Rollback procedure if something fails

Recipes could cover:

• Database extractor setup (MySQL, Postgres, Snowflake, etc.)
• Transformation pipeline (extract → transform → write)
• Project migration / cloning
• Dev branch workflow (branch → modify → test → merge)
• Data sharing between projects

Implementation options

1. Static recipes in YAML/JSON files shipped with CLI
2. Dynamic recipes that inspect project state and adapt
3. AI-generated recipes via the AI Service API

Context

Discussion from Devil's Advocate analysis of kbagent's agentic capabilities.

[padak]

Part of #152 (Modern Agentic CLI epic).