[Feat] Connect Brain context across team member identities

[roomote-roomote]

​Opened on behalf of @mrubens. Follow up by mentioning @roomote-roomote, in the web UI, or in Slack.

What changed

• Publish canonical people/ cards from existing Roomote users and linked Slack, GitHub, source-control, Telegram, Discord, and Teams identities.
• Keep person slugs stable across profile renames, scrub standalone and embedded email addresses from Brain labels, and reconcile updates, removed aliases, and deleted members.
• Add member names alongside raw Slack user IDs, link exact Granola attendee matches to canonical person pages, and re-project historical meetings after identity changes.
• Expose gbrain's read-only entity lookup and document when agents should use it.

Why this change was made

The Brain could retrieve activity about a person but had no canonical identity connecting names and provider handles across Slack, source control, and meeting notes. This made direct questions such as "who is this person?" noisy and unreliable.

Impact

Agents can now resolve known deployment members through one privacy-safe identity card and connect their activity across supported sources. Identity changes also restart Granola's bounded backfill once so existing meeting pages converge without waiting for note edits. Postgres remains authoritative, no schema migration is required, and existing raw provider IDs remain available for exact matching.

[roomote-community]

No new code issues found. See task

• Scrub embedded email addresses before adding member profile and provider values to Brain cards and Slack labels. (apps/bullmq/src/scheduled-jobs/brain-collectors.ts:1088)
• Re-project existing Granola meeting pages when identity mappings change so historical attendees receive canonical links. (apps/bullmq/src/scheduled-jobs/brain-collectors.ts:1721)

_{Reviewed e1f2e17}

[roomote-roomote]

Fixed both review findings in e1f2e17:

• Embedded email addresses are scrubbed from member names, provider values, aliases, cards, and Slack author labels.
• A stable identity-projection hash resets Granola's existing bounded backfill once per identity change, re-projecting historical meeting pages with canonical attendee links.

Both review threads are resolved. Focused collector tests, BullMQ type checking, formatting, linting, and the repository pre-push checks pass.