Expose the middleware chain on MCPServer and stop sending unrequested change notifications #3733

Job	Run time
checks / docs	45s
checks / readme-snippets	12s
checks / pre-commit	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	57s
checks / test (3.13, lowest-direct, windows-latest)	1m 55s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.11, locked, ubuntu-latest)	1m 21s
checks / test (3.11, lowest-direct, windows-latest)	2m 14s
checks / test (3.11, locked, windows-latest)	1m 56s
checks / test (3.10, locked, windows-latest)	1m 58s
checks / test (3.10, lowest-direct, windows-latest)	1m 56s
checks / test (3.13, locked, windows-latest)	1m 50s
checks / test (3.12, locked, ubuntu-latest)	1m 40s
checks / test (3.10, locked, ubuntu-latest)	1m 27s
checks / test (3.12, lowest-direct, windows-latest)	2m 2s
checks / test (3.14, lowest-direct, windows-latest)	2m 4s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.13, locked, ubuntu-latest)	1m 18s
checks / test (3.12, locked, windows-latest)	1m 47s
checks / test (3.14, locked, windows-latest)	1m 53s
checks / test (3.14, locked, ubuntu-latest)	1m 25s
all-green	3s
	34m 47s

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