Python: bump package versions for 1.2.1 release

[moonbox3]

Motivation and Context

PATCH bump (1.2.0 -> 1.2.1) for the released cohort.

Per lockstep convention, all 21 beta packages stamp 1.0.0b260428 and all 3 alpha packages stamp 1.0.0a260428, regardless of per-package code churn. Every non-core package floor on agent-framework-core is raised to

=1.2.1 to keep cohort signaling consistent. Date stamp reflects the local (Asia) cut date 2026-04-28.

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[github-actions]

Automated Code Review

Reviewers: 4 | Confidence: 71% | Result: All clear

Reviewed: Correctness, Security Reliability, Test Coverage, Design Approach

---

Automated review by moonbox3's agents

[moonbox3]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/core/agent_framework
_telemetry.py	52	5	90%	63, 78–80, 128
TOTAL	29883	3479	88%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
6029	30 💤	0 ❌	0 🔥	1m 42s ⏱️

[Copilot]

Pull request overview

Bumps the Python Agent Framework cohort to the 1.2.1 patch release, updating package versions in lockstep (GA/core to 1.2.1; beta/alpha packages to the 2026-04-28 datestamp) and aligning dependency floors on agent-framework-core>=1.2.1.

Changes:

• Bump GA package versions (agent-framework, agent-framework-core, agent-framework-foundry, agent-framework-openai) to 1.2.1.
• Stamp all beta/alpha Python packages to 1.0.0b260428 / 1.0.0a260428 and raise their agent-framework-core minimum to >=1.2.1.
• Update uv.lock and CHANGELOG.md for the 1.2.1 release.

Reviewed changes

Copilot reviewed 29 out of 30 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
python/uv.lock	Updates locked local package versions to 1.2.1 / *260428 cohort.
python/pyproject.toml	Bumps agent-framework to 1.2.1 and pins core to 1.2.1.
python/packages/a2a/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/ag-ui/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/anthropic/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/azure-ai-search/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/azure-cosmos/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/azurefunctions/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/bedrock/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/chatkit/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/claude/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/copilotstudio/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/core/pyproject.toml	Bumps agent-framework-core to 1.2.1.
python/packages/declarative/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/devui/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/durabletask/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/foundry/pyproject.toml	Bumps agent-framework-foundry to 1.2.1 and raises core floor.
python/packages/foundry_hosting/pyproject.toml	Bumps alpha version + raises core floor to >=1.2.1.
python/packages/foundry_local/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/gemini/pyproject.toml	Bumps alpha version + raises core floor to >=1.2.1.
python/packages/github_copilot/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/hyperlight/pyproject.toml	Bumps alpha version + raises core floor to >=1.2.1.
python/packages/lab/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/mem0/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/ollama/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/openai/pyproject.toml	Bumps agent-framework-openai to 1.2.1 and raises core floor.
python/packages/orchestrations/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/purview/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/packages/redis/pyproject.toml	Bumps beta version + raises core floor to >=1.2.1.
python/CHANGELOG.md	Adds 1.2.1 release notes + updates compare links.