Add richer OTel MCP span attributes #1752

Job	Run time
checks / pre-commit	30s
checks / readme-snippets	15s
checks / test (3.10, locked, windows-latest)	2m 48s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.12, lowest-direct, ubuntu-latest)	10m 15s
checks / test (3.10, lowest-direct, ubuntu-latest)	10m 15s
checks / test (3.12, locked, windows-latest)	3m 22s
checks / test (3.11, locked, ubuntu-latest)	10m 15s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.10, lowest-direct, windows-latest)	2m 31s
checks / test (3.10, locked, ubuntu-latest)	10m 15s
checks / test (3.11, lowest-direct, ubuntu-latest)	10m 16s
checks / test (3.11, locked, windows-latest)	2m 37s
checks / test (3.13, lowest-direct, ubuntu-latest)	10m 15s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.13, locked, ubuntu-latest)	10m 16s
checks / test (3.13, lowest-direct, windows-latest)	2m 39s
checks / test (3.13, locked, windows-latest)	2m 21s
checks / test (3.12, locked, ubuntu-latest)	10m 15s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.14, locked, windows-latest)	3m 7s
checks / test (3.14, lowest-direct, windows-latest)	2m 42s
all-green	5s
	1h 54m 37s

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