phase: 21_page_cleanups

**Phase 21 final verification pass** (all 3 task files already in `complete/`, working tree carries the implementation)

- **Verified** task 01: `#pause`/`Space`/`setPaused`/`_paused` gone — `grep -ri pause src/dashboards/web/` empty, 0 pause hits in all 8 served pages + 10 static assets; re-ran `data/logs/21-task01-nopause.cjs` → 30/30 PASS (hidden tab: 0 data fetches in 22 s, one poll 2 ms after return).
- **Verified** task 02: re-ran `21-task02-gpu-values.cjs` on the live fleet → all PASS (deskwork/driveripper show Model/VRAM/Pool/Temp at 16.3 px; gateway = 5 heroes, slot `hidden`, no `n/a`; hero order unchanged; GPU history chart still builds per host).
- **Verified** task 03: re-ran `21-task03-scroll.cjs` → 14/14 PASS (`class="data scroll"`, scrollWidth 1021 vs clientWidth 292 at 360 px, Rotate/Revoke/bundle reachable and hit-testable; unchanged at 1280 px). Screenshots refreshed in `data/logs/`.
- **Gate**: `uv run pytest` → **1471 passed, 15 skipped**; `--cov --cov-fail-under=94` → **98.94%**; `ruff check src tests agent` clean; `pyright` **0 errors**; `bash .agents/validate.sh` → **EXIT 0** (incl. `node --check`); `uv run pytest -m live --live` → **11 passed**; `/api/health` all 9 sources `ok`.
- **Docs fixed** (pre-existing + this phase): "all **eight** signed-in pages" was a miscount of `MARKUP_PAGES` (7 = 5 dashboards + `/settings` + `/certs`; `/login` is the 8th, unsigned) → corrected in `README.md`, `AGENTS.md` (×2) and the `tests/test_api.py` docstring/comment; `AGENTS.md` Commands hermetic tally 1470 → **1471**.
- **Docs reviewed, consistent**: Quickstart/commands/flags (`install-agent.sh`, `capture-fixtures.sh`, `dev-server.sh`), the env table vs `config.py`, every documented route vs the served route table, masthead/`/system` GPU/`/certs` scroll descriptions vs code, and all `data/logs/*` + `tests/fixtures/*` references.
- **Deviation**: `validate.sh`'s advisory `fastapi 0.153.0 → 0.156.4` left alone — no dependency was touched this phase, so AGENTS rule 8 ("check after touching dependencies") is not triggered; upgrading here would be an unrelated behaviour change.
- No live-infra changes made (repo-side + browser verification only).
- **Next pending phase**: `22_disks_hide_unconfigured`.

.agents/phases/complete/21_page_cleanups/00_phase.md

@@ -0,0 +1,34 @@
+# Phase 21 — Page cleanups: pause, GPU values, certs scroll
+
+**Source:** `TODO.md` L7, L9, L12 — "remove the pause button, GPU data as its own values, /certs table horizontal scroll"
+**Story:** n/a
+**Context:** `src/dashboards/web/pages/{disks,llm,system,ups}.html` line 25 (the `#pause` button, the only one in the served markup — `/`, `/certs` and `/settings` have none), `src/dashboards/web/static/app.js` (lines 587–615 the `poll()` `_paused` plumbing, lines 773–783 the `#pause` binding plus the `Space` shortcut), `src/dashboards/web/static/dash.css` line 203 (the comment naming the pause button), `src/dashboards/web/static/page-system.js` (lines 150–156 `gpuSub()` — the dense sub-line the TODO quotes, lines 164–188 `renderGpuSlot()`, line 72 the `data-k="gpus"` hero slot), `tests/test_api.py` (line 1425 — the six-heroes pin: "exactly six heroes: CPU, MEM, TEMP, DISK, GPU, NET", asserted over the three captures: discrete GPU, APU, no-GPU), `src/dashboards/web/pages/certs.html` line 81 (`<table class="data" id="agents-table">` — no `.scroll` modifier; `dash.css` gives `table.data` a scroll container only with the `.scroll` class), `src/dashboards/web/static/page-certs.js` (lines 55–56 — the table element references)
+
+## Objective
+
+Three small page-level cleanups, one per workstream: the pause button is gone from every page (the hidden-tab skip stays — a background tab idling its polls is not the operator's pause), the `/system` GPU data is split out of the dense sub-line into its own labelled values and a host with no GPU **omits** the slot instead of printing `n/a`, and the `/certs` agents table scrolls horizontally so the right-hand columns are reachable on a phone. No API surface changes; the pins that name the old behaviour (six heroes incl. an `n/a` GPU slot, the unpinned pause button) are rewritten, not left rotting.
+
+## Dependencies
+- `20_masthead_nav_polish` (todo) — the pause button lives in the masthead row task 01.01 reflows, and the `/system` hero row is re-measured under the new bar; landing 20 first keeps 21's diff confined to the page bodies.
+
+## Tasks
+1. `01_remove_pause_button.md` — delete the button, the `Space` shortcut, the `setPaused`/`_paused` plumbing and the CSS comment; the hidden-tab skip survives
+2. `02_gpu_own_values.md` — the dense `gpuSub()` line becomes four labelled values per card; a GPU-less host omits the slot (five heroes, no `n/a`)
+3. `03_certs_table_scroll.md` — `#agents-table` gets the `.scroll` modifier so its right-hand columns are reachable at phone width
+
+## Testing & Quality
+- Unit/integration: `tests/test_api.py` — the served-page pins: the pause button absent from the four pages (a return of `#pause` fails a test), the six-heroes pin rewritten (GPU-present host: six, GPU-absent host: five with no `data-k="gpus"` slot), the `#agents-table` `.scroll` pin; `tests/test_system_contract.py` + `tests/card_contract.py` stay green (the API fields are unchanged — only the page's reading of them moves)
+- Coverage: **>90%** on new/modified code (the phase is markup + JS + CSS; the gate applies to the changed Python test files)
+- The phase is "Complete" only when the **entire** project test suite passes 100% (every test in the project, not just this phase's)
+
+## Documentation & Consistency
+
+- The final pass reviews `README.md` and `AGENTS.md` in full against the project as it stands after this phase — fixing every inconsistency found, **including pre-existing ones not caused by this phase**. AGENTS.md's `/system` paragraph ("a missing number or verdict — gateway's CPU temp, any host's absent GPU — prints `n/a` **uncoloured**") is the one rule this phase inverts for the GPU slot (the CPU-temp `n/a` stays — the TODO quotes the GPU line only); the sentence is split, the GPU half rewritten to the omission rule, and the pause button's mention in the masthead comment dropped.
+
+## Completion Criteria
+- [ ] no page serves a `#pause` button or binds the `Space` key; a hidden tab still skips its polls (served-bytes pin + a CDP `visibilitychange` check)
+- [ ] `/system`'s GPU slot prints model / VRAM / pool / temp as four labelled values; a GPU-less host (the no-GPU capture, gateway) renders five heroes with no GPU slot and no `n/a` in it (screenshots in `data/logs/`)
+- [ ] at 360 px the `/certs` agents table scrolls horizontally to its last column (screenshot in `data/logs/`)
+- [ ] `uv run pytest` green, coverage not down, `ruff` + `pyright` clean
+- [ ] `bash .agents/validate.sh` green (including `node --check` of the modified page scripts)
+- [ ] no behavior change in completed work: the six-hero order on GPU hosts, the hidden-tab skip, the GPU history charts, the `/certs` row contents and the event pager are all unchanged