Listener posts "Thinking..." placeholder and async-invokes a new
exec-aide-conversation Lambda that runs a Bedrock Sonnet tool-use loop
over 7 email tools, then updates the Slack message with the response.
Bedrock Haiku now classifies marketing/promotional emails as MARKETING
and they are filtered out before saving or alerting. This replaces
Gmail label-based filtering for more accurate classification.
Also: enable Fargate listener (desiredCount=1), update README for CDK,
update Notion AWS Architecture Map and Slack Apps Inventory.
SAM is for simple serverless stacks; this project has ECS, VPC, and
multi-service composition which requires CDK. Migration brings
ContainerImage.fromAsset() for automatic Docker builds on deploy,
matching the seahaven-slack-bot pattern.
Also fixes: Bedrock model ID (add version suffix), Gmail history API
parameter (labelId not labelIds), classify JSON extraction (handle
markdown fences), and digest block limit (cap sections at 5 items
to stay under Slack's 50-block limit).
