feat(datasources): add Airtable datasource template

[robertmonka]

• Added Airtable datasource template

[entelligence-ai-pr-reviews]

EntelligenceAI PR Summary

Adds Airtable as a documented datasource in anton/core/datasources/datasources.md.

• Defines YAML configuration schema with engine, access_token, base_id, table_name (required), and view (optional) fields
• Provides a Python test snippet using httpx to validate connectivity via the Airtable list-records API (pageSize=1)
• Includes explanation of bearer-token authentication used for Airtable API access

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Confidence Score: 5/5 - Safe to Merge

Safe to merge — this PR adds a well-structured Airtable datasource template to anton/core/datasources/datasources.md with no logic, runtime, or security issues identified. The YAML schema correctly distinguishes required fields (engine, access_token, base_id, table_name) from optional ones (view), and the Python connectivity test snippet using httpx with a pageSize=1 probe is a reasonable minimal validation pattern. No review comments were raised, no pre-existing unresolved concerns apply to this file, and the change is purely additive documentation.

Key Findings:

• The YAML configuration schema in datasources.md cleanly separates required from optional fields and uses a standard bearer-token authentication pattern consistent with Airtable's public API documentation.
• The Python test snippet correctly targets the Airtable list-records endpoint with pageSize=1 to minimize data transfer during connectivity validation, which is an efficient and appropriate probe strategy.
• The change is purely additive — it introduces no modifications to existing code paths, configuration parsing logic, or runtime behavior, making regression risk effectively zero.
• No review comments, heuristic flags, or unresolved prior concerns were identified across the single changed file, satisfying the criteria for a Score 5 (Safe to Merge) determination.