chore: merge release v1.26.0 to main

[Jacksunwei]

Syncs version bump and CHANGELOG from release v1.26.0 to main.

[gemini-code-assist]

Summary of Changes

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This pull request synchronizes the main branch with the v1.26.0 release, incorporating a substantial collection of new features, critical bug fixes, and internal code improvements. The changes primarily focus on updating version numbers, enhancing the changelog, refining session management for streaming, and introducing deprecation warnings for module imports to guide future development.

Highlights

• Version Update: The project version has been updated to 1.26.0 across relevant configuration and source files.
• Changelog Expansion: The CHANGELOG.md has been significantly expanded to include numerous new features, bug fixes, code refactorings, and documentation updates for the 1.26.0 release.
• Session Validation Refinement: The session validation logic in the ADK web server's streaming response handling has been refactored to prevent issues with OpenTelemetry context detachment by validating the session before starting the stream.
• Deprecation of Skill System Instruction Import: A deprecation warning has been introduced for importing DEFAULT_SKILL_SYSTEM_INSTRUCTION from google.adk.skills and google.adk.skills.prompt, guiding users to import it from google.adk.tools.skill_toolset instead.
• Release Configuration Update: The release-please-config.json has been updated with a new last-release-sha and its changelog-sections formatting has been expanded for better readability.

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Changelog

• .github/.release-please-manifest.json
  • Updated the project version from "1.25.1" to "1.26.0".
• .github/release-please-config.json
  • Updated the last-release-sha to reflect the latest release commit.
  • Expanded the formatting of changelog-sections for improved readability and maintainability.
• CHANGELOG.md
  • Added a new section for version 1.26.0 with detailed entries for Features, Bug Fixes, Code Refactoring, and Documentation.
• src/google/adk/cli/adk_web_server.py
  • Modified the run_agent_sse function to validate session existence directly before starting the streaming response, addressing potential OpenTelemetry context issues.
• src/google/adk/skills/init.py
  • Added DEFAULT_SKILL_SYSTEM_INSTRUCTION to the __all__ export list.
  • Implemented a __getattr__ method to issue a DeprecationWarning when DEFAULT_SKILL_SYSTEM_INSTRUCTION is imported from this module, advising to use google.adk.tools.skill_toolset instead.
• src/google/adk/skills/prompt.py
  • Added Any and warnings imports.
  • Implemented a __getattr__ method to issue a DeprecationWarning when DEFAULT_SKILL_SYSTEM_INSTRUCTION is imported from this module, advising to use google.adk.tools.skill_toolset instead.
• src/google/adk/version.py
  • Updated the __version__ string from "1.25.1" to "1.26.0".

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[gemini-code-assist]

Code Review

This pull request merges the v1.26.0 release into the main branch. It includes version bumps in configuration files, an updated CHANGELOG, a bugfix in the ADK web server to correctly handle OpenTelemetry context in streaming responses, and deprecation warnings for DEFAULT_SKILL_SYSTEM_INSTRUCTION to guide users towards a new import path. The changes are well-implemented and look good.

[adk-bot]

Thank you @Jacksunwei for your contribution! 🎉

Your changes have been successfully imported and merged via Copybara in commit 1206add.

Closing this PR as the changes are now in the main branch.