feat: v0.9.1 — left-pane time controls refined: log-scale slider (t→round(60^t), 250 ms debounced commit with release flush + in-flight queue) replaces the scale select; game clock now shows seconds (HH:MM:SS UTC)

CHANGELOG.md

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 # Changelog
 
+## v0.9.1 — 2026-09-17 16:03
+- **Log-scale time slider** (left-pane UI refinement): the 1x–60x `<select>` in `components/LeftPane.tsx` is replaced by a single `<input type="range" data-testid="time-scale-slider">` — position t ∈ [0,1] maps to `scale = round(60^t)` (t=0→1×, mid≈8×, t=1→60×) so equal slider distances are equal multiplicative steps; 60 discrete positions (`step = 1/59`) keep keyboard arrows usable (~7% per step). The current value is shown beside the slider as "N×" (`data-testid="time-scale-value"`); pause/resume toggle unchanged
+- **Debounced commit**: dragging updates the displayed value optimistically; `POST /api/sim {timeScale}` fires after a 250 ms debounce and flushes immediately on release (native `change` event); a commit landing while another POST is in flight is held in a single slot and flushed right after, so rapid slider moves never drop the last intent — server's [1,60] clamp kept as backstop, no new dependencies
+- **Pure mapping helpers** in new `lib/timeScale.ts`: `sliderToScale(t)` / `scaleToSlider(scale)`, both clamped; exact at endpoints and round-tripping every integer 1..60
+- **Game clock shows seconds**: `formatSimClock` (in `lib/format.ts`) now renders the sim clock as `YYYY-MM-DD HH:MM:SS UTC` — same deterministic UTC wall-clock, seconds added
+- No backend changes: `POST /api/sim` signature and clamp unchanged; no OpenAPI change
+- Tests: unit — new `lib/timeScale.test.ts` (endpoint exactness 0→1/1→60, mid-slider ≈8×, monotonic non-decreasing over a 2000-step grid, full 1..60 coverage, clamping of out-of-range/non-finite input, round-trip for all integers 1..60) and `lib/format.test.ts` clock expectations updated to include seconds; e2e — `e2e/panes.spec.ts` time-controls test re-driven through the slider (keyboard End → max asserts label "60×" + `/api/state` timeScale=60, Home → min asserts "1×" + timeScale=1) and now also asserts the clock text matches `HH:MM:SS`; live instance restored to scale 1 + unpaused in-test and in `afterEach` as before
+- Verified: unit suite 150 → 159 green; `tsc --noEmit` clean; e2e re-run against the rebuilt compose instance
+
 ## v0.9.0 — 2026-09-17 14:24
 - **Single-screen 3-pane shell** (PLAN.md "Layout" increment): `app/page.tsx` is now a CSS grid (`grid-template-columns: 300px minmax(0, 1fr) 320px`) — left Assets pane, center = the existing `<Map/>` **untouched** (its `.map-wrap` fills the middle column, header included), right placeholder `data-testid="right-pane"` with a subtle "Jobs & Market" heading so the next increment has a home
 - **Single polling source**: new hook `lib/useGameState.ts` polls `GET /api/state` every 1000 ms (configurable arg) and returns `{state, loading, error, refresh}` — overlap guard skips a tick while the previous request is still in flight, interval cleaned up on unmount. Called ONCE in `app/page.tsx`; the snapshot flows down as props so later panes share one poll loop instead of running their own