Add daily activity digest — Phase B (v0.1.0:77)

Sends a once-a-day internal email to all active admins summarizing each team
member's email activity per investor, plus a team-wide by-investor view
(inbound + outbound, deduped). Narratives are generated on the LOCAL Spark
model, never Claude — the digest is intentionally un-anonymized, so substance
stays on Ten31 infra. This is an internal ops email, exempt from the
'agents draft, humans send' rule (which governs outward LP contact).

- backend/digest_builder.py: per-user + per-investor activity queries
  (soft-delete filtered), per-user Spark narrative with a deterministic
  fallback, two-section plain-text body, and the DB-backed policy resolver.
- backend/email_integration/digest_scheduler.py: always-on daily thread that
  re-reads the policy each cycle and sends once/day; window cursor in
  app_settings so a missed day rolls forward.
- server.py: POST /api/admin/digest/send-now and GET/PATCH
  /api/admin/digest/policy; scheduler wired into main().
- Control lives in Settings -> Admin (enable toggle + send-time dropdown),
  not StartOS actions; env vars only seed the first-boot default.
- Tests: backend/test_digest_builder.py.

ROADMAP.md

@@ -87,7 +87,7 @@
 ## Backlog (post-Phase-1 agentic)
 
 ### Daily activity digest (email to the team)
-*Requested 2026-06-15. **Phase A built + deployed** (v0.1.0:75 live on the box; send path then moved to **Gmail DWD** in v0.1.0:76, redeploy pending). Phase B (digest content + Spark summarization + daily scheduler) remains.*
+*Requested 2026-06-15. **Phase A deployed** (v0.1.0:76, live on the box). **Phase B built 2026-06-15** (digest content + Spark summarization + daily scheduler + on-demand send) — in the repo, awaiting the next build/deploy.*
 
 **Decisions (locked 2026-06-15):** recipients = **all active admins**; summarization = **Spark-LLM narrative** (never Claude — un-anonymized substance stays local); granularity = **grouped by user** (→ per investor).
 
@@ -95,7 +95,7 @@
 
 **Phase A — DONE:** (v0.1.0:75) `configureDigestSmtp` Start9 action + `docker_entrypoint.sh` `SMTP_*` export + `backend/smtp_send.py` + admin `POST /api/admin/digest/test-email` (recipient-restricted to the admin set — not an open relay) + Settings button. (v0.1.0:76, redeploy pending) `backend/email_integration/gmail_send.py` (`users.messages.send` via DWD/compose) + `backend/digest_mailer.py` (**Gmail-DWD preferred, SMTP fallback**); the endpoint + button route through it; sender = `CRM_DIGEST_SENDER` else first active admin. Tests: `test_smtp_send.py`, `test_smtp_endpoint.py`, `test_gmail_send.py`.
 
-**Phase B — TODO:** daily scheduler (co-locate with `email_integration/scheduler.py`); per-user→per-investor activity query (`deleted_at IS NULL` throughout); Spark-narrative summary of captured email substance; compose + send to all admins.
+**Phase B — DONE (2026-06-15/16):** `backend/digest_builder.py` builds **two sections** — *by team member* (per-user **Spark** narrative + both directions, with a deterministic fallback) and *by investor* (team-wide, inbound + outbound, deduped per email, structured). Soft-delete filtered throughout. `backend/email_integration/digest_scheduler.py` is an always-on daily thread that re-reads a **DB-backed policy** each cycle and sends once/day at the configured hour to all active admins (window cursor in `app_settings`). Control moved out of env into the **admin panel**: `app_settings.digest_policy` + `GET/PATCH /api/admin/digest/policy` + a Settings → Admin **enable toggle + send-time dropdown** (env vars only seed the first-boot default). Plus admin `POST /api/admin/digest/send-now` + a "Send Digest Now" button. Decisions settled: **6 PM default**, **always-send** (empty-day note), **per-user narrative + by-investor section**, **in-app control** (not StartOS). Tests: `backend/test_digest_builder.py`. Detail: `docs/guides/email.md`.
 
 Have the CRM send a **daily digest email** summarizing each registered user's activity — primarily **who emailed which investors and the substance of those emails** — to the fund principal (and eventually other admins). Scales with the synced-user count: 2 users synced today, ~5 eventually.
 
@@ -106,7 +106,7 @@ Have the CRM send a **daily digest email** summarizing each registered user's ac
 - **Scheduling:** a daily cron, naturally co-located with the existing `backend/email_integration/scheduler.py` sync cadence.
 - **Soft-delete:** every aggregate/read in the digest must filter `deleted_at IS NULL` (see the standing soft-delete rule).
 
-Open design questions (Phase B detail, still to settle): fixed daily send time; "nothing happened today" suppression; whether the Spark summary is per-investor-thread or a single per-user narrative.
+Open design questions (settled at build time): send time = **6 PM box-local** (configurable in the admin panel), covering the ~24h window up to send; empty days = **always send** with a "no activity" note; summary granularity = **one per-user narrative** plus a **by-investor structured section** (inbound + outbound, team-wide) added 2026-06-16; enable/time live in the **admin panel** (DB-backed), not StartOS actions.
 
 ## Definition of done for "Airtable substitute" v1
 - Team can manage all investors in one master table