ci: Add ITK test suite (#868)

# Description

The PR adds:

* implementation of itk testing agent for "current" branch
* integration of itk into python sdk
* deployment of itk test into github actions
* execution of compatibility tests with stable sdks (python-v10,
python-v03, go-v10, go-v03)

- [x] Follow the [`CONTRIBUTING`
Guide](https://github.com/a2aproject/a2a-python/blob/main/CONTRIBUTING.md).
- [x] Make your Pull Request title in the
<https://www.conventionalcommits.org/> specification.
- Important Prefixes for
[release-please](https://github.com/googleapis/release-please):
- `fix:` which represents bug fixes, and correlates to a
[SemVer](https://semver.org/) patch.
- `feat:` represents a new feature, and correlates to a SemVer minor.
- `feat!:`, or `fix!:`, `refactor!:`, etc., which represent a breaking
change (indicated by the `!`) and will result in a SemVer major.
- [x] Ensure the tests and linter pass (Run `bash scripts/format.sh`
from the repository root to format)
- [ ] Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> 🦕

Co-authored-by: Krzysztof Dziedzic <dziedzick@google.com>

Author: kdziedzic70

.github/actions/spelling/allow.txt

@@ -63,7 +63,10 @@ initdb
 inmemory
 INR
 isready
+itk
+ITK
 jcs
+jit
 jku
 JOSE
 JPY
@@ -107,11 +110,13 @@ protoc
 pydantic
 pyi
 pypistats
+pyproto
 pyupgrade
 pyversions
 redef
 respx
 resub
+rmi
 RS256
 RUF
 SECP256R1

.github/workflows/itk.yaml

@@ -0,0 +1,31 @@
+name: ITK
+
+on:
+  push:
+    branches: [main, 1.0-dev]
+  pull_request:
+    paths:
+      - 'src/**'
+      - 'itk/**'
+      - 'pyproject.toml'
+
+permissions:
+  contents: read
+
+jobs:
+  itk:
+    name: ITK
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
+      - name: Run ITK Tests
+        run: bash run_itk.sh
+        working-directory: itk
+        env:
+          A2A_SAMPLES_REVISION: itk-v0.1-alpha

.gitignore

@@ -12,3 +12,8 @@ coverage.xml
 spec.json
 docker-compose.yaml
 .geminiignore
+
+# ITK Integration Test Artifacts
+itk/a2a-samples/
+itk/pyproto/
+itk/instruction.proto