feat: Phase 18 - Agent Tagging Infrastructure

[RichardHightower]

Summary

Implements Phase 18 of v2.1 Multi-Agent Ecosystem milestone, adding multi-agent support to agent-memory:

• Event.agent field — Track which AI agent (Claude, OpenCode, Gemini, Copilot) produced each event
• memory-adapters crate — New SDK crate with AgentAdapter trait for building agent-specific adapters
• CLI --agent filter — Filter queries by agent on teleport and retrieval commands
• TocNode.contributing_agents — Track which agents contributed to each time period
• Query filtering — StopConditions.agent_filter for retrieval operations

Changes

Proto Schema (proto/memory.proto)

• Add optional string agent = 8 to Event message
• Add agent_filter to TeleportSearchRequest, VectorTeleportRequest, HybridSearchRequest, RouteQueryRequest
• Add agent to RetrievalResult

New Crate: memory-adapters

• AgentAdapter trait with agent_id(), display_name(), normalize(), load_config()
• RawEvent struct for raw event data before normalization
• AdapterConfig for adapter-specific settings
• AdapterError for error handling

memory-types

• Event.agent: Option<String> with #[serde(default)]
• TocNode.contributing_agents: Vec<String>
• Builder methods with_agent(), with_contributing_agent()

memory-daemon CLI

• --agent/-a filter on teleport search, teleport vector-search, teleport hybrid-search
• --agent/-a filter on retrieval route

memory-retrieval

• StopConditions.agent_filter for query filtering

memory-service

• Ingest handler extracts agent from proto Event
• Normalizes to lowercase, empty strings treated as None

Test plan

• cargo test -p memory-types — 61 tests pass
• cargo test -p memory-adapters — 19 tests pass
• cargo test -p memory-retrieval — 53 tests pass
• cargo clippy — No warnings
• Backward compatibility tests for pre-phase-18 data

Requirements Coverage

Requirement	Description	Status
R4.1.1	Agent identifier field in events	✓
R4.1.2	Automatic agent detection	Foundation
R4.1.3	Agent metadata in TOC nodes	✓
R4.2.2	Filter by agent	✓
R5.2.1	Adapter trait definition	✓
R5.2.2	Event normalization	✓
R5.2.3	Configuration loading	✓

🤖 Generated with Claude Code