[changelog] Add changelog for v1.0.13

[github-actions]

Caution

Protected files were modified in this change.
This pull request is in request_review mode and requires explicit human scrutiny before merge.

Protected files: CHANGELOG.md

Adds the CHANGELOG.md entry for release v1.0.13, covering all user-visible changes merged since the previous stable release (v1.0.11), including changes from intermediate prereleases (v1.0.12-preview.0 through v1.0.13-preview.4).

Highlights:

• Cancellation for host-owned external tools
• Client info declaration across all SDKs
• Node Agent Factories pagination and run notifications
• ask_user tool variant
• Rotating session-scoped GitHub credential callbacks
• Extension environment variables
• Rust PreparedSession
• Managed settings permissions
• Auto model routing tier controls (setAutoTier)
• Sandbox allowBypass and non-object external tool arguments
• Host-resolved feature flag overrides

Also includes an "Other changes" list of smaller bugfixes/improvements and a "New contributors" section.

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• github.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "github.com"

See Network Configuration for more information.

Generated by Release Changelog Generator · copilot · auto · 125.2 AIC · ⌖ 8.09 AIC · ⊞ 11.7K · ◷

[github-actions]

Protected files were modified in this pull request and require manual scrutiny before merge.

Please verify that each protected-file change is intentional, policy-compliant, and safe:

• Protected files: CHANGELOG.md