Add a client-side response cache honoring SEP-2549 caching hints#3023

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client-response-cache

Commits on Jun 29, 2026

Move CacheableMethod to mcp_types.methods and derive CACHEABLE_METHODS from the method registry
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Add client response cache primitives: config, keys, store protocol, in-memory store
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Add client response cache coordinator: scope arms, era gating, TTL resolution, eviction
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Wire the response cache into Client: configuration, server identity, notification eviction
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Serve cacheable client verbs through the response cache
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Treat negative inbound ttlMs as zero at the client parse seams
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Document the client response cache
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Add end-to-end hardening tests for the client response cache
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Cover float negative ttlMs on the discover seam in the auto-mode test
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Document eviction timing, refetch policy, shared-store races, and the TTL cap
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Tighten response cache: session guard, identity and meta handling, refresh purge
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Apply configured cache hints to mapping handler results and fix unknown-key error formatting
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Trim comments and docstrings
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Address review feedback: drop tutorial globals, plain-ASCII docs prose, remove section header
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Keep the tutorial handler a plain function with a separate state holder
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Era-scope cache arms and harden store interaction paths
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Strip userinfo textually and address review notes on the docs
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Address review feedback on identity stripping and stale tool-map pruning
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