Unread direct messages were invisible unless agents remembered to query task_messages manually. Route unread message summaries through the attention inbox and render them during SessionStart so blocking and reply-needed messages become turn-start context while FYI stays collapsed.

Constraint: SessionStart must stay cheap, so the hook disables stalled-lane filesystem reads when it only needs task-scoped unread messages.

Rejected: Render every FYI preview inline | would add context noise and defeat the urgency dial.

Confidence: high

Scope-risk: moderate

Directive: Keep FYI collapsed unless product data shows agents miss low-urgency context.

Tested: pnpm --filter @colony/core test -- attention-inbox.test.ts; pnpm --filter @colony/hooks test -- task-injection.test.ts; pnpm --filter @colony/core typecheck; pnpm --filter @colony/hooks typecheck; pnpm exec biome check touched files; git diff --check

Not-tested: @imdeadpool/colony-cli typecheck is blocked by existing @colony/spec errors in apps/mcp-server/src/tools/spec.ts