fix: use HTTP 404 for invalid session IDs per MCP spec#1703

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ctonneslan wants to merge 1 commit intomodelcontextprotocol:mainfrom

ctonneslan:fix/streamable-http-session-id-status-code

Commits on Mar 19, 2026

fix: use HTTP 404 instead of 400 for invalid session IDs
ctonneslan
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