[codex] select first product connector candidate

[pearjelly]

Summary

• Select the Lark/Feishu task connector as the first product-specific connector candidate.
• Add docs/first-product-connector-candidate.md with alternatives, minimum create_task action surface, package layout, manifest/executor scope, credential handle rules, dry-run smoke plan, compact audit metadata, and Loop 36 entry conditions.
• Update the roadmap to mark Loop 35 complete and set Loop 36 as the next dry-run package smoke.
• Add a docs contract test for the Loop 35 decision artifact.

Validation

• PYTHONPATH=src python3 -m unittest tests.test_first_product_connector_candidate_docs -v
• PYTHONPATH=src python3 -m unittest discover -s tests -v
• python3 scripts/external_connector_smoke.py --work-dir /tmp/skill2workflow-external-connector-loop35
• python3 -m py_compile src/skill2workflow/*.py
• python3 scripts/secret_hygiene.py examples/workflows
• git diff --check
• git diff --cached --check

[chatgpt-codex-connector]

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