feat(server): thread tenant_id through MCPServer handlers to managers #24

Job	Run time
checks / pre-commit	39s
checks / readme-snippets	14s
checks / test (3.12, locked, windows-latest)	3m 28s
checks / test (3.10, locked, ubuntu-latest)	57s
checks / test (3.12, locked, ubuntu-latest)	59s
checks / test (3.11, lowest-direct, windows-latest)	2m 48s
checks / test (3.10, lowest-direct, windows-latest)	2m 33s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.10, locked, windows-latest)	2m 33s
checks / test (3.14, locked, windows-latest)	3m 5s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, locked, ubuntu-latest)	48s
checks / test (3.14, locked, ubuntu-latest)	2m 14s
checks / test (3.11, locked, windows-latest)	2m 17s
checks / test (3.13, lowest-direct, ubuntu-latest)	58s
checks / test (3.13, locked, windows-latest)	2m 22s
checks / test (3.13, lowest-direct, windows-latest)	2m 48s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, windows-latest)	3m 43s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
all-green	4s
	39m 59s

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