Add session notes for 2026-09-23 (CR-019 / D18 work)

docs/waves/notes-2026-09-23.md

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+# Session notes — 2026-09-23
+
+Working notes for the `feat/waves-11-13` line (CR-019, CR-020 reserved, D18),
+written up before merge. Not a spec document — `wave-11.md`, `wave-13.md` and
+`decisions-2026-09-17.md` are the source of truth for scope and acceptance
+criteria. This is the "what actually happened building it" record.
+
+## What shipped today
+
+**CR-019 (wave 11) — usage/activity metrics, T11.1 through T11.6 complete:**
+
+- `UsageEvent` table + migration (T11.1), a capture endpoint wired into
+  `auth-guard.js` so every protected page pings it once per load, plus a
+  `login` event at Okta sign-in (T11.2).
+- `GET /api/usage/summary` (T11.3) — active users by day/week/month,
+  per-user last-active, per-tool breakdown, filterable by date/project/
+  user/tool, all combinable.
+- `GET /api/usage/export` (T11.4) — raw and sanitized CSV. Sanitized mode
+  replaces the username with an HMAC-SHA256 pseudonym (keyed with
+  `auth.SECRET_KEY`), stable per user across rows and across separate
+  export calls, so an external tool (Power BI etc.) can still group by
+  user without ever seeing a real name.
+- A new "Activity & usage" card in the admin console (T11.5): real filter
+  controls, the summary tables, both export buttons. Client-side gated
+  admin-only same as the rest of the console; the API underneath is
+  independently gated server-side regardless.
+- Retired the old per-browser "Usage logs" panel and `wp-usage.js`
+  entirely (T11.6) — it had no reader left and was never a real data
+  source for the new report anyway. The scattered `track()` call sites in
+  the creator and wizard were left in place calling a documented no-op,
+  rather than deleting ~45 individual call sites for the same effect.
+
+Only **T11.7 (final wave verification)** is left before wave 11 is fully
+closed out — everything under it has already been verified per-task, so
+this is a consolidation pass, not new work.
+
+**D18 (wave 13) — Okta/AD deprovisioning, T13.1 only:**
+
+- Session lifetime changed from one flat `AUTH_SESSION_HOURS` to a sliding
+  idle timeout (`AUTH_IDLE_MINUTES`, default 30) capped by a hard ceiling
+  from original sign-in (`AUTH_SESSION_HOURS`, default 8, meaning changed
+  from "session length" to "absolute ceiling"). Both defaults are flagged
+  in `.env.example` and `DEPLOYMENT.md` as proposed, not confirmed against
+  the tenant's actual Okta SSO policy.
+- **T13.2 onward (the actual Okta Management API sync job) is paused** —
+  explicit call from Matt: no Okta API credential yet, come back to it
+  later. Not started, not blocked on anything code-side.
+
+**CR-020 (wave 12, bulk user editing):** not started. Reserved, scoped in
+`wave-12.md`, no code touched.
+
+## Environment work (not itself a task, but load-bearing)
+
+- Fixed a CRLF/LF mismatch that was making every tracked file look modified
+  to this session's git client (`core.autocrlf true`, repo-local, no file
+  content changed).
+- This machine had no Python. Installed it via `winget` (`Python.Python.3.12`)
+  and set up a `.venv` in the repo with `server/requirements.txt` installed,
+  specifically so `tests/baseline_shots.py` could run locally — this
+  sandbox has no headless-capable browser and can't download one (network
+  allowlist), so the 390px/1440px screenshot verification CLAUDE.md asks
+  for had to run on Matt's own machine instead, using the browser already
+  installed there (Edge).
+- Established a repeatable local verification loop for every task: throwaway
+  SQLite, fake-Okta sign-in, promote to admin, `seed_demo.py` +
+  `smoketest.py` (27/27 passing throughout), plus `baseline_shots.py` for
+  anything touching `html/`.
+
+## Standing constraints, still in effect
+
+- Everything stays local on this branch line. No `git push` at any point
+  today.
+- One task per PR discipline was kept even though all of it landed on one
+  branch — each commit corresponds to exactly one task ID, in wave order,
+  each individually verified before the next started.
+
+## Before merging
+
+- Run T11.7 (full wave-11 verification pass) and record it in `wave-11.md`.
+- Decide where this branch actually merges to — `feat/waves-11-13` has all
+  of today's commits already; this notes branch was cut from it so it can
+  fast-forward back in, or merge as its own PR if the notes should be
+  reviewed separately from the code.
+- T13.2+ and all of wave 12 remain explicitly out of scope until Matt says
+  otherwise.