Elicitation support

[anna239]

No description provided.

[Copilot]

Pull request overview

Adds elicitation support to the ACP Kotlin client/model layers, including new RPC methods/types and client-side routing for session- and request-scoped elicitations.

Changes:

• Introduces elicitation protocol model types (schemas, request/response, capabilities) and method declarations.
• Adds client/agent operations for elicitation plus routing logic (session-scoped, request-scoped via in-flight request association, and global fallback).
• Updates protocol request tracking to associate outgoing requests with SessionId, and adds broad test coverage for serialization + end-to-end flows.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
build.gradle.kts	Bumps library version to 0.19.0.
acp/src/jvmTest/kotlin/com/agentclientprotocol/client/ElicitationSessionMapTest.kt	Unit tests for bounded elicitation→session store behavior and eviction.
acp/src/commonMain/kotlin/com/agentclientprotocol/protocol/Protocol.kt	Tracks optional SessionId per outgoing request; exposes lookup API; updates cancellation logic.
acp/src/commonMain/kotlin/com/agentclientprotocol/protocol/Protocol.extensions.kt	Passes sessionId into raw requests by extracting it from AcpWithSessionId.
acp/src/commonMain/kotlin/com/agentclientprotocol/common/ElicitationOperations.kt	Adds client-side elicitation operation contract.
acp/src/commonMain/kotlin/com/agentclientprotocol/common/ClientSessionOperations.kt	Extends client session ops to include elicitation operations.
acp/src/commonMain/kotlin/com/agentclientprotocol/client/GlobalElicitationHandler.kt	Adds global fallback handler for non-session elicitations.
acp/src/commonMain/kotlin/com/agentclientprotocol/client/ElicitationSessionStore.kt	Implements bounded store mapping URL elicitation IDs to sessions for completion routing.
acp/src/commonMain/kotlin/com/agentclientprotocol/client/Client.kt	Wires elicitation request + completion handlers; routes by session/request scope; adds global fallback.
acp/src/commonMain/kotlin/com/agentclientprotocol/agent/RemoteClientSessionOperations.kt	Implements remote elicitation calls and adds convenience helpers.
acp/api/acp.api	Updates published API surface for new elicitation APIs and protocol signature changes.
acp-model/src/commonTest/kotlin/com/agentclientprotocol/model/ElicitationSerializationTest.kt	Serialization/deserialization coverage for elicitation requests/responses/capabilities/schemas.
acp-model/src/commonMain/kotlin/com/agentclientprotocol/model/Methods.kt	Adds elicitation/create and elicitation/complete method definitions.
acp-model/src/commonMain/kotlin/com/agentclientprotocol/model/Elicitation.kt	Adds elicitation model types, serializers, capabilities, and error code constant.
acp-model/src/commonMain/kotlin/com/agentclientprotocol/model/Capabilities.kt	Adds elicitation to ClientCapabilities.
acp-model/api/acp-model.api	Updates published model API surface for elicitation types/capabilities.
acp-ktor-test/src/commonTest/kotlin/com/agentclientprotocol/FeaturesTest.kt	Adds end-to-end feature tests for elicitation flows and routing behaviors.

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[Copilot]

Elicitation.kt defines both top-level StringPropertySchema/NumberPropertySchema/etc and the sealed ElicitationPropertySchema variants with the same fields. These top-level schema types are currently unused in the codebase (all usages go through ElicitationPropertySchema.*), which increases public API surface and risks divergence/confusion. Consider removing them, making them internal, or reusing them from ElicitationPropertySchema to avoid duplicate representations.