fix(slack): Stop sending synthetic resource-event timestamps#741
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Prevent synthetic resource-event mailbox ids from being treated as native Slack message timestamps. Resource-event notifications no longer serialize raw.ts, Slack message-targeting APIs require a schema-branded SlackMessageTs, and durable helpers only use explicit persisted slackTs context. Update the Slack/resource-event contracts and regression coverage so processing reactions stay off synthetic notifications while historical malformed raw.ts payloads remain ignored. Fixes JUNIOR-3B Co-Authored-By: GPT-5 Codex <codex@openai.com>
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Prevent synthetic resource-event mailbox ids from crossing into Slack message-targeting APIs.
Resource-event notifications now serialize without a native Slack raw.ts, and Slack reaction/delete/resume/tool paths require a schema-branded SlackMessageTs parsed from native Slack timestamp fields. Durable resume and vision helpers now use explicit persisted meta.slackTs rather than inferring provider context from message ids.
This also updates the Slack/resource-event contracts so synthetic notifications are documented as mailbox context rather than native Slack messages, and adds regression coverage for historical malformed raw.ts payloads plus serializer output.
Found while investigating production Slack reactions.add message_not_found errors.
Fixes JUNIOR-3B