Add missing TasksCallCapability to enable proper MCP task support (#1… #551

Job	Run time
checks / pre-commit	35s
checks / readme-snippets	10s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, windows-latest)	2m 31s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.10, highest, windows-latest)	2m 27s
checks / test (3.12, highest, ubuntu-latest)	52s
checks / test (3.11, highest, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, windows-latest)	2m 28s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, highest, windows-latest)	2m 59s
checks / test (3.12, lowest-direct, windows-latest)	3m 37s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.13, lowest-direct, windows-latest)	2m 26s
checks / test (3.13, highest, ubuntu-latest)	47s
checks / test (3.12, highest, windows-latest)	3m 53s
checks / test (3.14, lowest-direct, windows-latest)	2m 45s
checks / test (3.13, highest, windows-latest)	2m 41s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.14, highest, windows-latest)	2m 25s
checks / test (3.14, highest, ubuntu-latest)	1m 10s
	37m 40s

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