chore(main): release python 1.6.0

[langwatch-agent]

🤖 I have created a release beep boop

1.6.0 (2026-09-10)

Features

• voice/twilio: a-leg external-number dialing for TwilioAgentAdapter (#982) (29dea33)

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[github-actions]

Automated low-risk assessment

This PR was evaluated against the repository's Low-Risk Pull Requests procedure.

• Scope: Bump python package version to 1.6.0; update python/CHANGELOG.md and .release-please-manifest.json (release metadata).
• Exclusions confirmed: no changes to auth, security settings, database schema, business-critical logic, or external integrations.
• Classification: low-risk-change under the documented policy.

The diff only updates release metadata: bumps the Python package version, updates the CHANGELOG, and updates the release-please manifest. It does not touch authentication/authorization, secrets, database schemas, business-critical logic, or third‑party integrations, so it meets the low-risk criteria.

An approving review has been submitted by automation. The PR may merge once required CI checks pass.

[github-actions]

Approved by automation: PR qualifies as low-risk-change under the documented policy.