feat: cancellable Actor run

[MichalKalita]

Closes: #160

Tested in:

• Claude desktop: ❌ doesn't work, in Claude logs is missing a notification for cancel run
• VSCode: ✅ works
• Integration tests: ✅ MCP client has a manual request method, with the option to AbortSignal. Internally, the MCP Client sends a cancel notification when the signal is called. https://github.com/modelcontextprotocol/typescript-sdk/blob/1f5950be01927cb8e4e555cb5584c44db1604f39/src/shared/protocol.ts#L620

I tried to write a test using manually sending a cancel notification, but I need a request ID, and I don't know where to find it because it's managed internally in the MCP client.

[MichalKalita]

We could add a test to check that cancelled requests don't send any response. Now is only tested than request is cancelled.

[MQ37]

As I already menitoned in person, please change the Actor in tests to either apify/python-example or apify/rag-web-browser. These are already on staging and I would prefer to not add a new Actor there to our testing suite. If that is not possible we can include this Actor (if truly needed). Otherwise LGTM, thank you 👍

[jirispilka]

I agree with @MQ37. I also left a couple of comments that should be taken care of.

It should also be possible to send the cancel/notification to actor-mcp, but let’s not complicate this issue with that.

Please create a new issue so we don’t forget.

[MichalKalita]

I also need to check if the Actorized MCP server receives a cancel notification. I could try to make some tests, but it can be hard/impossible with actual source code.

[jirispilka]

I left a couple of questions, if you can please address them

[MichalKalita]

I tested the cancellation of the job working for the actor and the call-actor tool. Checked with VSCode.
I keep tests there, only for the streamable transfer type.

I found a bug where the client in test is not closed when some test fails. It's fixed when the client is always closed in afterEach

[jirispilka]

I haven't checked the tests ... the rest look good to me. Thanks