docs: lead messaging with token reduction, not dollar savings

Tokens are the durable invariant; the dollar figure is a pricing-dependent
consequence that evaporates if Anthropic reprices.

- README: headline + intro now lead with input-token reduction; the
  ~59-70% end-to-end bill is demoted to a downstream effect 'at current
  Fable list prices', with the dollar math pointed to the FAQ
- dashboard: stop claiming Claude's replies are 'never compressed' (false
  for any session past keepTail) — scope to latest messages + live output

README.md

@@ -1,23 +1,24 @@
 # pxpipe
 
-**Cut Claude Code input-token spend by rendering bulky context as images.**
+**Cut Claude Code's input tokens by rendering bulky context as images — the same system prompt, tool docs, and history, in a fraction of the tokens.**
 
-Anthropic bills an image by its pixel dimensions, not by how much text is
-inside it. Dense content (code, JSON, tool output) packs ~3.1 chars per
+An image's token cost is fixed by its pixel dimensions, not by how much
+text is inside it. Dense content (code, JSON, tool output) packs ~3.1 chars per
 image-token vs ~1 char per text-token on real Claude Code traffic. pxpipe is a
 local proxy that exploits that gap: it rewrites the bulky parts of your
 request (system prompt, tool docs, older history) into compact PNGs before
 the request leaves your machine.
 
 Savings are **workload-dependent** — pxpipe wins on token-dense content and
-leaves sparse/small requests untouched — so this is a measured snapshot, not a
-constant. Across production traces the **end-to-end bill drops ~59–70%**
-(**~72–74%** on the requests it actually compresses), with full dollar math:
-input + cache writes at 1.25× + cache reads at 0.1× + output at 5×, every
-request measured against its own `count_tokens` counterfactual. Two snapshots: a
-13,709-request log turned $100 into ~$41 (59% end-to-end; ~$28 / 72% on the
-7,756 it compressed); a later 8,904-compressed-request trace measured ~70%
-end-to-end / ~74% compressed. Reproduce it on your own traffic from
+leaves sparse/small requests untouched — so these are measured snapshots, not
+constants. The primary, durable result is **input-token reduction**: dense
+system prompts, tool docs, and history go in as compact images instead of text
+(the example above is ≈25k text tokens rendered as ≈2.7k image tokens), every
+request measured against its own `count_tokens` counterfactual. **Dollars are
+downstream of that** — at current Fable list prices the token cut lands as a
+**~59–70% lower end-to-end bill** (~72–74% on compressed requests; full pricing
+math in the FAQ). But list prices can change tomorrow and the token count
+won't, so tokens — not dollars — are the number to watch. Reproduce both from
 `~/.pxpipe/events.jsonl`.
 
 This is what the model sees instead of text:

src/dashboard/fragments.ts

@@ -181,7 +181,7 @@ export function renderSessionSummaryFragment(data: CurrentSessionPayload): strin
     `<div class="hero-headline"><span class="hero-num">${bigNum}</span> ${word} sent to Claude</div>` +
     `<div class="hero-sub">` +
     `<strong>${kFmt(ppTotal)}</strong> tokens actually sent vs <strong>${kFmt(textTotal)}</strong> if it were all plain text. ` +
-    `Your messages and Claude's replies are never compressed.` +
+    `Your latest messages and Claude's live output are never compressed.` +
     `</div>` +
     `<div class="hero-meta">` +
     `Input context compressed <b class="${inputPct >= 0 ? 'good' : 'bad'}">${inputPct.toFixed(0)}%</b> ` +
@@ -254,7 +254,7 @@ export function renderHeaderFragment(s: StatsPayload, port: number): string {
       numFmt(s.saved_input_tokens),
       'vs sending the same context as text',
       'pos',
-      'Bulky context (system prompt, tool output, old turns) sent as compact images instead of text. Cache-aware, input side only — your replies are never compressed.',
+      'Bulky context (system prompt, tool output, old turns) sent as compact images instead of text. Cache-aware, input side only — recent turns and the live output stay text.',
     ) +
     statTile(
       'Estimated saved',