Release v0.5.0 · cmj0121/imagelet

Highlights

OHLC + MA position bars on /stock — two stacked bars centered on the current quote, sharing a price-relative axis fitted per-bar (floored ±0.5%, capped ±5%) so quiet days fill the bar instead of clustering at center. Markers past the band edge clip with ▶/◀ saturation sentinels.
HTML date navigation — on-screen chevrons + keyboard shortcuts (←/h, →/l step days; t clears ?date=; ?/Esc toggle help). Held arrows are short-circuited via e.repeat. A "viewing past date" pill appears when ?date= is set.
On-disk cache snapshots (--cache-dir) — per-stock TWSE (T86 / TWT93U / MARGN) and TAIFEX (retail futures / options PCR / VIX) caches now persist to JSON files under the supplied directory; restored on startup, saved atomically on graceful shutdown. Schema-versioned, so future cached-value field additions invalidate stale snapshots gracefully.
Generic TTL+LRU+singleflight cache (internal/ttlcache) — backs Yahoo, TWSE, and TAIFEX providers with negative-cache support. Walk-back loop now lives in the cache wrapper; providers expose Fetch*Exact(date) and the wrapper handles holiday/weekend probing.

Adaptive Yahoo windowing for MA5/MA10 fields.
Mobile-responsive chevron buttons.
Documentation refresh: cache layers, --cache-dir, OHLC/MA glyph vocabulary, HTML keyboard shortcuts.

```
ghcr.io/cmj0121/imagelet:0.5.0
```