Add richer OTel MCP span attributes #1754

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	32s
checks / test (3.10, locked, windows-latest)	2m 15s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.11, lowest-direct, ubuntu-latest)	58s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.10, lowest-direct, windows-latest)	2m 32s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, locked, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	2m 36s
checks / test (3.12, lowest-direct, windows-latest)	3m 40s
checks / test (3.13, locked, windows-latest)	2m 41s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.12, locked, windows-latest)	3m 15s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.13, locked, ubuntu-latest)	53s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.14, lowest-direct, windows-latest)	2m 22s
checks / test (3.14, locked, ubuntu-latest)	2m 22s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, locked, windows-latest)	3m 31s
all-green	2s
	40m 9s

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