fix: replace generic API structure with CLI flag mapping in knowledge output

[moekatib]

Summary

• Replaces the generic {{PATH}}, {{BODY}}, {{QUERY_PARAMS}} placeholders in knowledge output with an explicit CLI PARAMETER MAPPING section
• Shows agents exactly which flags to use: --path-vars for URL placeholders, --query-params for query parameters, -d for request body
• Includes a ready-to-use example command template with the actual platform and actionId
• Warns agents not to pass path/query params in the -d body flag

Test plan

• Run one --agent actions knowledge gmail <actionId> and verify the output includes the CLI PARAMETER MAPPING section
• Verify the example command includes the correct platform and actionId
• Test that an agent can follow the knowledge output to correctly execute an action with path vars and query params on first attempt

Closes #8

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