chore(agent): phase roadmap from TODO.md, 4 phases

06 system_page_gpu_verdicts — GPU stops carrying a verdict, GPU temp on the
   hero row, per-host history charts collapsed behind a toggle (TODO L3/L4/L9)
07 llm_monitor_style_pages — /slots schema pinned from the live server,
   broken slot table removed, fleet totals block, stats strip, slot grid
   (full restyle; TODO L5)
08 events_paging_and_copy — event feeds scrollable + paginated, flavour text
   stripped, rule pinned in AGENTS.md (TODO L6/L7)
09 disks_smartctl — smartctl physical-disk collection in the host agent,
   5-minute disks source/poller/store, /api/disks + severity rows, /disks
   page + nav tab + overview entry (TODO L8)

LLM-Generated: true

.agents/phases/todo/09_disks_smartctl/00_phase.md

@@ -0,0 +1,52 @@
+# Phase 09 — A /disks page for physical disk health (smartctl)
+
+**Source:** `TODO.md` L8 — "a truly physical disk monitoring page": "Add a 'disks' tab dedicated to smartctl and per-disk metrics. Note: not per-partition, but truly a physical disk monitoring page that collects data about all my physical disks across my fleet (should only be deskwork and driveripper right now)."
+**Story:** n/a
+**Context:** `agent/host_agent.py` (physical whole disks via `/sys/block`, ~L400 — already partition-free; stdlib-only, `ProtectSystem=strict`), `src/dashboards/config.py` (env only, sources default to unset), `src/dashboards/poller.py` (one task per source, stale/last-good, events under the dashboard name), `src/dashboards/store.py` (WAL, rollups raw→1m→1h, retention — rule 9), `src/dashboards/api.py` (GETs, 404-when-unconfigured without dialling), the three existing dashboards + `/` overview (a new tab joins the nav and the overview's "which of the three" table)
+
+## Objective
+
+A fourth dashboard: `/disks` — one card per **physical** disk (the agent's whole-
+`/sys/block` enumeration, never partitions), each carrying `smartctl` health: overall
+health, temperature, power-on hours, and the sector/wear alarms. Its own `disks` source
+and poller task at a slow 5-minute cadence (SMART is not a per-second signal), its own
+API (`/api/disks/snapshot`, `/api/disks/history`), rollups and retention, and a page that
+reads `n/a` for what `smartctl` cannot see — never red for a missing binary.
+
+- ASSUMPTION (phase, confirmed): the agent reads SMART **directly** (`smartctl` as the
+  agent user, e.g. `disk` group) — no sudo — and `DISKS_INTERVAL_SECONDS` defaults to
+  **300** s. `smartctl` absent or a disk unreadable → that disk's `smart` is `null`
+  with an error entry; the page says "smartctl not available" dimmed (invariants 3/4:
+  unconfigured is not broken; a dead source must not blink another).
+
+## Dependencies
+
+- `08_events_paging_and_copy` (todo) — sequence only: it settles `app.js`/`dash.css`
+  (the pager + copy audit) that the new page builds on; no hard code dependency.
+
+## Tasks
+
+1. `01_agent_smartctl_collection.md` — `host_agent.py` gains a `smartctl` pass over its existing whole-disk list (per-device `smartctl -i -A -H`, stdlib `subprocess`, timeout-bounded); fixture from the real disks; deploy docs.
+2. `02_disks_source_poller_store.md` — the `disks` source (payload + `disk.*@dev` samples), its own poller job at `DISKS_INTERVAL_SECONDS` (default 300), rollups + retention in `store.py`.
+3. `03_disks_api_and_config.md` — `/api/disks/snapshot` + `/api/disks/history`, config wiring, `404 {"configured": false}` without dialling, severity rows for the health/temperature metrics.
+4. `04_disks_page_and_overview.md` — the `/disks` page (per-disk cards, alarm chips, per-host history charts), nav tab + overview entry + header status dot.
+
+## Testing & Quality
+
+- Hermetic: fixture-driven agent tests (`tests/test_agent.py` + recorded `smartctl`
+  output), `tests/test_disks_source.py` (new), `tests/test_api.py` key-path pins (with
+  and without config), `node --check`.
+- Live: `uv run pytest -m live --live` — the agent on deskwork/driveripper answers
+  `smart` fields for its real disks; **live tests must not write** (no `smartctl -t`, no
+  self-test on hardware something is plugged into).
+- Browser (DoD): screenshots in `data/logs/` — per-disk cards on live data, the
+  "smartctl not available" state, the overview with the new tab.
+- Coverage: **>90%** on new/modified code, ≥94% overall gate maintained.
+
+## Completion Criteria
+
+- [ ] `GET /api/disks/snapshot` answers per-disk `smart` data for every physical disk the agents report; `404 {"configured": false}` with no agents configured, without dialling
+- [ ] `/api/disks/history` serves the `disk.*@dev` series through the existing rollups
+- [ ] the `/disks` page renders one card per physical disk (never per-partition) with health, temp, power-on hours and non-zero alarm chips
+- [ ] a host without `smartctl` (or a denied read) shows dimmed `n/a` cards, never a red page
+- [ ] `bash .agents/validate.sh` green; screenshots in `data/logs/`