Sync SDK with CLI v2.1.87

[guess]

Summary

• Bump bundled CLI version from 2.1.76 to 2.1.87
• Add ApiRetry and SessionStateChanged system message types
• Add get_context_usage, reload_plugins, and seed_read_state control protocol requests
• Add --system-prompt-file, --append-system-prompt-file, and --bare CLI options
• Update type-mapping and cli-flags reference files, CLAUDE.md

Test plan

• All 1514 tests pass (0 failures)
• mix quality passes (compile, format, credo, dialyzer)
• New message types tested: parsing, fallback clauses, type guards
• New control requests tested: JSON wire format verification
• New options tested: validation and CLI flag conversion

[guess]

Code review

Found 1 issue:

1. New system message subtypes ApiRetry and SessionStateChanged are not registered in lib/claude_code/message/system_message.ex. The @type t union (line 24) and type?/1 guard (lines 42-54) are missing clauses for both new structs. This means Message.message?/1 returns false for these message types, since it delegates to SystemMessage.type?/1 for system messages. Code that filters or routes messages using message?/1 will silently drop API retry and session state change notifications.

claude_code/lib/claude_code/message/system_message.ex

Lines 23 to 54 in 532d204

	@type t ::
	Init.t()
	| CompactBoundary.t()
	| HookStarted.t()
	| HookResponse.t()
	| HookProgress.t()
	| Status.t()
	| LocalCommandOutput.t()
	| FilesPersisted.t()
	| ElicitationComplete.t()
	| TaskStarted.t()
	| TaskProgress.t()
	| TaskNotification.t()
	@doc """
	Checks if a value is any type of system message.
	"""
	@spec type?(any()) :: boolean()
	def type?(%Init{}), do: true
	def type?(%CompactBoundary{}), do: true
	def type?(%HookStarted{}), do: true
	def type?(%HookResponse{}), do: true
	def type?(%HookProgress{}), do: true
	def type?(%Status{}), do: true
	def type?(%LocalCommandOutput{}), do: true
	def type?(%FilesPersisted{}), do: true
	def type?(%ElicitationComplete{}), do: true
	def type?(%TaskStarted{}), do: true
	def type?(%TaskProgress{}), do: true
	def type?(%TaskNotification{}), do: true
	def type?(_), do: false

Every other system message subtype in the codebase is registered in both the type union and the guard function. The fix is to add aliases, type union entries, and type?/1 clauses for ApiRetry and SessionStateChanged.

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