0.9.0

[Lance-Drane]

There are enough changes here, and this fixes enough flaws with the original design, that I think we should go ahead and release this.

This makes considerable internal changes, and is best understood by observing the following issues. This does not change the public API by much, but it does change how events function.

This MR does NOT include:

• the encryption logic (it does add a "default capability")
• any registry service integration

(these features will come in a future release)

Closes #8 #13 #23 #24 #26 #29 #33 #40

TODOS BEFORE RELEASING 0.9.0

• make sure to update CHANGELOG.md and src/intersect_sdk/version.py before release
• make sure to add user-facing upgrade information to UPGRADING.md

[marshallmcdonnell]

Overall, looking great!
Agree, there is a lot here already and justifies 0.9.0 release.

Specifically, I like the new events by capability setup (ping @andrewfayres on that one!), MQTT support dropping 3 and adding 5, new core capabilities, and definitely the headers logic!

Issues:

• looks like CI caught some tests on specific version of python, copy-pasted the two failed tests below if that helps:

SKIPPED [1] tests/unit/test_schema_invalids.py:745: Python 3.11 does not allow dataclasses to be constructed in this improper format
FAILED tests/e2e/test_examples.py::test_example_4_service_to_service - subprocess.TimeoutExpired: Command '['/home/runner/work/python-sdk/python-sdk/.venv/bin/python', '-m', 'examples.4_service_to_service.example_client']' timed out after 60 seconds
FAILED tests/integration/test_service.py::test_call_user_function - TypeError: 'UserspaceMessageHeaders' object is not subscriptable

• Ruff linting caught a few errors as well

I'll launch a copilot review after those are fixed, just to see what it says (not required to address everything it might bring up)

Yet, merge whenever you feel ready.
I'll put requested changes but will readily approve after CI is green

[Lance-Drane]

I fixed the few remaining bugs in the tests, one of the tests caught an error with how external requests were being handled. Went ahead and merged, will be releasing 0.9.0 shortly.