fix: cancellation state & xml format

[ashenfad]

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[Copilot]

Pull request overview

This PR fixes two main issues related to task cancellation: correcting when cancellation is checked during task execution, and updating XML rendering to use consistent XML tags for task outcomes.

Key Changes:

• Test updates to verify cancellation occurs during task execution rather than between separate task runs
• XML rendering now uses structured tags (<TASK_SUCCESS>, <TASK_FAIL>, <TASK_CLARIFY>, <TASK_CANCELLED>) instead of emoji-prefixed text
• Stale cancellation signals are now cleared at task start to prevent false cancellations

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/agex/test_cancellation.py	Updated tests to verify cancellation during task execution via event callbacks instead of between runs
tests/agex/render/test_xml.py	Updated assertions to check for XML tags instead of emoji markers
agex/render/xml.py	Implemented XML tag rendering for all task outcome events (success, fail, clarify, cancelled)
agex/llm/xml.py	Added new XML tag constants for task outcomes
agex/llm/dummy_client.py	Added renderer selection support to enable XML rendering in tests
agex/agent/loop/sync_loop.py	Added stale cancellation signal cleanup at task start and reordered event logging before snapshot
agex/agent/loop/async_loop.py	Applied same cancellation signal cleanup as sync version
agex/render/definitions.py	Added strip_all_modules parameter to remove module prefixes from type annotations in directly-registered classes

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