[santiagomed]

Stacked on #34.

Adds a signer for conversation setting changes, available in every binding:

Setting	Event signed	Payload extras
message_duration (+ ttl_msec)	ConversationMetadataChangeEvent.MessageDurationChange	ttl
remove_message_duration	…MessageDurationRemove	—
mute / unmute	…MuteConversation / …UnmuteConversation	muted conversation id
enable_screen_capture_blocking / disable_screen_capture_blocking	…EnableScreenCaptureBlocking / …DisableScreenCaptureBlocking	—

The result is a single ActionSignature, the same shape prepare_message_delete returns. Every field matches the thrift schema in the repo. Mute and unmute follow the native clients: they are signed for the sender's own {sender}:{sender} conversation, with the target conversation listed in the event. Signed changes round-trip through the existing verifier.

API (builder pattern, additive only):

• Rust: ConversationSettingsParams::new(conversation_id, ConversationSetting::MessageDuration { ttl_msec }) with with_identity. ConversationSetting::from_name parses the names, and a new public signatures::build_action_signature helper is added.
• Python: prepare_conversation_settings_change(conversation_id, setting, *, ttl_msec=None, sender_id=None, signing_key_version=None)
• JS: prepareConversationSettingsChange({ conversationId, setting, ttlMsec })
• Go: PrepareConversationSettingsChange(ConversationSettingsParams{…}) with Setting… constants
• .NET / JVM: a ConversationSetting enum plus TtlMsec / ttlMsec

Input errors say what to pass:

• ttl_msec missing, not positive, or set for a setting other than message_duration
• an empty or unknown setting (the error lists the valid names)
• an empty conversation id
• a non-integer ttlMsec (JS)
• an undefined enum value (.NET) or a null setting (JVM)

Screen-capture detection is not offered, because the native clients never send it.

Docs: docs/API.md gets a table row, a section, and Rust/JS/Python snippets. The example ChatCore wrappers in all six languages get a prepare_settings_change helper.

Tests

• make ci (fmt, clippy -D warnings, license check, workspace tests): 562 core tests pass, 7 of them new.
• Bindings: Python 68, JS all suites, Go pass, .NET 85, JVM 68.
• Examples: Rust 13, Python 14, JS 15, Go pass, .NET 14, JVM 13.

  

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