[bug] remember never propagates decisions to is_global, so Team Decisions stays empty (ADR-0200) #561

What happened

remember never marks a decision as global, so the SessionStart "Team Decisions" block and the subagent briefing almost never find anything.

The documented contract (Transactive Memory Systems, Wegner 1987) is that a protected decision written under an agent context propagates to team scope via is_global=TRUE:

• docs/adr/ADR-0200-mcp-server-core-memory-ingest.md:68-78
• mcp_server/core/memory_ingest.py:91-92: if auto_protect and agent_ctx and not is_benchmark: is_global = True
• mcp_server/hooks/session_start.py:196-203 (docstring, reproduced in ADR-0498): "Decisions auto-propagate via is_global=TRUE set during ingestion (memory_ingest.py)"

But core/memory_ingest.py is imported only by benchmarks and tests. On the live remember path, is_protected is set from is_decision_content (mcp_server/handlers/remember_helpers.py:709) and is_global only comes from the explicit argument or detect_global (mcp_server/handlers/remember.py:285-288). The Team Decisions query requires is_protected AND is_global AND agent_context != '' (mcp_server/hooks/session_start.py:207-239).

Measured on the live PostgreSQL store on 2026-09-15 (current rows, superseded_by_id IS NULL):

Reproduction steps

1. Commit a3b3a79d. Call remember(content="Decision: we keep X because Y", agent_topic="cortex").
2. The row is stored with is_protected = TRUE, agent_context = 'cortex', is_global = FALSE.
3. Start a new session: the row is not in "Team Decisions".

Expected behavior

A decision stored through remember with a non-empty agent_topic gets is_global = TRUE, as memory_ingest.py does, and appears in Team Decisions at the next SessionStart and in agent_briefing.

Environment

• macOS 26, PostgreSQL backend, Cortex 4.21.0, commit a3b3a79

Severity

High (core feature broken, no workaround)

Evidence required to close

A test on the remember handler asserting the ADR-0200 propagation rule (decision + agent_topic → is_global; no agent_topic → unchanged; benchmark source → unchanged), and a one-shot migration decision for the 233 existing rows, recorded in the PR.