Python: bump package versions for 1.3.0 release (#5706)

* Python: bump package versions for 1.3.0 release

MINOR bump on the released cohort (agent-framework, agent-framework-core,
agent-framework-openai, agent-framework-foundry: 1.2.2 -> 1.3.0). All 22
beta packages stamp 1.0.0b260507 and all 3 alpha packages stamp
1.0.0a260507 per the lockstep convention. Date stamp reflects 2026-05-07
Pacific.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address review: bump foundry_local openai floor, fix devui orchestrations pin, clarify breaking scope

- foundry_local: bump agent-framework-openai lower bound from >=1.1.0 to >=1.3.0
- devui: update stale agent-framework-orchestrations dev pin from 1.0.0b260402 to 1.0.0b260507
- CHANGELOG: clarify [BREAKING] applies to experimental skills API only

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Revert devui orchestrations pin to 1.0.0b260402 to avoid breaking DevUI

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/packages/devui/pyproject.toml

@@ -4,7 +4,7 @@ description = "Debug UI for Microsoft Agent Framework with OpenAI-compatible API
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260429"
+version = "1.0.0b260507"
 license-files = ["LICENSE"]
 urls.homepage = "https://github.com/microsoft/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
  dependencies = [
-     "agent-framework-core>=1.2.2,<2",
+     "agent-framework-core>=1.3.0,<2",
      "openai>=1.99.0,<3",
      "opentelemetry-sdk>=1.39.0,<2",
      "fastapi>=0.115.0,<0.133.1",