AHP Swift Package v0.5.0

[0.5.0] — 2026-06-26

Implements AHP 0.5.0.

Added

• ChatActivityChangedAction (StateAction.chatActivityChanged, wire
  chat/activityChanged) for updating a chat's current activity description
  independently of the session summary.
• ProgressParams struct (wire root/progress) — a generic progress notification
  correlated by a progressToken (added on CreateSessionParams).
  Used today for the lazy first-use download of an agent's native SDK.
• SessionModelInfo.maxOutputTokens and SessionModelInfo.maxPromptTokens
  optional fields for communicating model token limits.
• SessionSummary.meta (_meta on the wire) optional provider metadata field
  for lightweight session-list presentation hints.
• SessionActiveClientRemovedAction (StateAction.sessionActiveClientRemoved,
  wire session/activeClientRemoved) to release a single active client by
  clientId.
• ChatDraftChangedAction (StateAction.chatDraftChanged, wire
  chat/draftChanged) and ChatState.draft (Message?) to set or clear the
  user's in-progress draft input for a chat. The chat reducer applies it
  without stamping modifiedAt.
• Message.model and Message.agent optional fields carrying the selection a
  message was composed with.

Changed

• SessionState.activeClients ([SessionActiveClient], required) replaces the
  single optional SessionState.activeClient; the session reducer upserts and
  removes entries keyed by clientId.
• StateAction.sessionActiveClientChanged is renamed to
  StateAction.sessionActiveClientSet (wire session/activeClientSet) with
  upsert-by-clientId semantics; it no longer unsets the active client
  (dispatch session/activeClientRemoved instead).
• ConfigPropertySchema.enum field is now [AnyCodable]? instead of
  [String]?, allowing numeric, boolean, and null enum values.
• ModelSelection.config values are now AnyCodable instead of String,
  allowing numeric, boolean, and null configuration values.
• SessionState now inlines the session metadata fields (provider, title,
  status, activity, project, workingDirectory, annotations) directly
  instead of embedding a summary: SessionSummary. The session reducer mutates
  these fields directly and no longer stamps a modifiedAt. SessionSummary
  remains a root-only catalog struct whose createdAt/modifiedAt are now
  ISO-8601 Strings and which no longer carries model/agent.
• ChatState and ChatSummary no longer carry model/agent.

Removed

• SessionActiveClientToolsChangedAction. An active client now updates its
  published tools by re-dispatching StateAction.sessionActiveClientSet with its
  full, updated entry.
• SessionModelChangedAction (StateAction.sessionModelChanged,
  session/modelChanged) and SessionAgentChangedAction
  (StateAction.sessionAgentChanged, session/agentChanged), along with their
  session-reducer handling.