Add config update command for rename/description

[padak]

Summary

Resolves #37

New command: kbagent config update --project ALIAS --component-id ID --config-id ID [--name NAME] [--description DESC] [--branch ID]

• Rename configurations and/or update descriptions
• Targets active dev branch by default, --branch to override
• Validates that at least --name or --description is provided
• Uses existing client.update_config() (added in sync Phase 2)

Usage

# Rename a config
kbagent --json config update --project prod \
  --component-id keboola.python-transformation-v2 \
  --config-id 1248470031 --name "New Name"

# Update description only
kbagent --json config update --project prod \
  --component-id keboola.ex-http --config-id 67890 \
  --description "Updated description"

# Both + specific branch
kbagent --json config update --project prod \
  --component-id keboola.ex-http --config-id 67890 \
  --name "Renamed" --description "New desc" --branch 456

Note

MCP server already has update_config tool, but a native CLI command is simpler for scripting/CI and avoids MCP subprocess overhead.

Test plan

• kbagent config update --help shows all options
• All 1045 tests pass, lint clean
• Context and SKILL.md updated