feat(session-ingest): gate remote session pushes by user

[eshurakov]

Summary

• replace the disabled remote-session attention push flag with an exact single-user rollout gate
• forward the optional REMOTE_SESSION_ATTENTION_PUSH_USER_ID through queued and direct ingest dispatches
• document the setting and cover disabled, non-selected, and selected-user behavior

Validation

• pnpm exec vitest run src/remote-session-notifications.test.ts
• pnpm run typecheck
• pnpm run lint
• pnpm -w exec oxfmt --check changed files
• pnpm run test (498 passed; one existing R2-offload route test timed out at 5 seconds)

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

The rollout gate correctly replaces the disabled flag with an exact single-user-ID comparison, is consistently threaded through both the direct-ingest and queue-consumer dispatch paths, and is covered by tests for the disabled, non-matching, and matching-user cases.

Files Reviewed (8 files)

• services/session-ingest/.dev.vars.example
• services/session-ingest/src/env.ts
• services/session-ingest/src/ingest/direct-ingest.ts
• services/session-ingest/src/queue-consumer.ts
• services/session-ingest/src/remote-session-notifications.test.ts
• services/session-ingest/src/remote-session-notifications.ts
• services/session-ingest/worker-configuration.d.ts (generated file, skipped)
• services/session-ingest/wrangler.jsonc

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_{Reviewed by claude-sonnet-5 · Input: 20 · Output: 3.9K · Cached: 392.6K}

_{Review guidance: REVIEW.md from base branch main}

[St0rmz1]

Low, Functional: This trims remoteSessionAttentionPushUserId before comparing it to params.kiloUserId, but does not guard against params.kiloUserId being empty. If kiloUserId were ever an empty string and the env var were unset or empty, ''.trim() === '' would be true and the gate would incorrectly pass instead of suppressing. There's no code path today that produces an empty kiloUserId, so this is a defensive gap rather than an active bug. Suggest adding an explicit guard, e.g. if (!params.kiloUserId || deps.remoteSessionAttentionPushUserId?.trim() !== params.kiloUserId), so the empty string case is not incidentally treated as a match.