## ADDED Requirements

### Requirement: Debounced memory update queue
The system SHALL collect memory update requests into a queue and process them after a configurable debounce period.

#### Scenario: Items enqueued per (thread, user, agent) key
- **WHEN` a conversation context is added to the queue
- **THEN** it SHALL be keyed by `(thread_id, user_id, agent_name)` for deduplication
- **WHEN** a second context arrives for the same key before processing
- **THEN** the previous context SHALL be replaced with the newer one

#### Scenario: Debounce timer resets on each enqueue
- **WHEN` a new item is enqueued
- **THEN** the debounce timer SHALL reset to the configured `debounce_seconds`
- **WHEN** no new items arrive within the debounce window
- **THEN** the queue SHALL be processed

#### Scenario: Immediate processing option
- **WHEN** `add_nowait()` is called instead of `add()`
- **THEN** the queue SHALL start processing immediately in a background thread

### Requirement: Background thread execution for memory updates
The system SHALL execute memory updates (LLM extraction + persistence) in a background thread to avoid blocking the agent loop.

#### Scenario: Async flush via threading.Thread
- **WHEN` conversation messages are flushed to memory
- **THEN** the flush SHALL run in a `threading.Thread` (daemon=True)
- **THEN` the main agent SHALL NOT wait for the flush to complete

#### Scenario: Thread pool for sync LLM calls
- **WHEN** a memory update requires a synchronous LLM call
- **THEN** the call SHALL be offloaded to a `ThreadPoolExecutor` (max_workers=4)
- **THEN** this SHALL prevent blocking the main event loop

### Requirement: Content deduplication for flush
The system SHALL deduplicate message content before flushing to avoid redundant summarization.

#### Scenario: MD5 content hash dedup
- **WHEN** messages are about to be flushed
- **THEN** each message content SHALL be MD5-hashed
- **WHEN** a hash matches a previously flushed message
- **THEN** that message SHALL be skipped

#### Scenario: Scheduler pair stripping
- **WHEN** messages contain scheduler-injected pairs (marked with `[SCHEDULED]` prefix)
- **THEN** the scheduler user message and its paired assistant response SHALL be stripped before flushing

### Requirement: Configuration-driven memory processing
The system SHALL support configuration to enable/disable background memory processing.

#### Scenario: Memory processing disabled
- **WHEN** `memory_config.enabled` is `False`
- **THEN** no memory updates SHALL be queued or processed
- **THEN** queue `add()` calls SHALL be no-ops

#### Scenario: Rate limiting between updates
- **WHEN** processing multiple queued memory updates
- **THEN` a 0.5 second delay SHALL be inserted between updates to avoid LLM API rate limits
