CEP 6 step wise implementation

[kushagra0902]

CEP-6 Announcement Lifecycle Orchestrator

Overview

Currently, the ContextVM Rust SDK requires manual calls to announce(), publish_tools(), etc., lacking a unified lifecycle orchestrator. This epic implements the AnnouncementManager module for the server side, fully automating capability discovery, payload synthesis, and structured publishing to Nostr relays.

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PR 1: Core Data Structures & Helpers

Goal: Establish the correct data shapes and helper functions required for CEP-6, ensuring strict schema compliance before touching the transport lifecycle.

• Define ServerAnnouncementContent struct in src/core/types.rs matching the CEP-6 schema (nested protocolVersion, capabilities, serverInfo, instructions).
• Create tag builder helpers and use existent ones(get_common_tags(), set_extra_tags(), set_pricing_tags()).
• Update client-side parsing in src/discovery/mod.rs to handle the new ServerAnnouncementContent safely.
• Test: Schema to Kind mapping (ensure kinds 11316-11320 serialize exactly as specified).

PR 2: AnnouncementManager Engine

Goal: Build the standalone orchestrator that manages the announcement lifecycle, fetching capabilities automatically.

• Create new module: src/transport/server/announcement_manager.rs.
• Implement publish_public_announcement(): Acts as the bootstrap point. Triggers synthetic initialize requests to the local MCP handler to fetch tools/list, resources/list, resourceTemplates/list, and prompts/list.
• Implement publish_relay_list() (CEP-17 integration, will be hard coded for now at the required places and will be updated once cep 17 is done).
• Implement publish_to_relay() to handle structured Nostr serialization.
• Implement the background lifecycle loop to manage periodic republishing and connection state.
• Test: Init timeout (verify graceful failure if no response from local MCP handler).

PR 3: Transport Integration & Cleanup

Goal: Wire the AnnouncementManager into the NostrServerTransport, enable it via configuration, and remove deprecated legacy code.

• Add announce: bool to NostrServerTransportConfig.
• Modify NostrServerTransport::start() to spawn the AnnouncementManager background task if config.announce == true.
• Pass the local MCP channel to the manager so it can send its synthetic requests.
• Clean up: Remove duplicate/legacy manual announcement functions from NostrServerTransport.
• Test: Announcement manager publishes on start if announce: true is set.
• Test: Start/stop lifecycle for the announcement manager.
• Test: Verify bootstrap relays successfully receive discoverability events.