Capture harness, fixture verification, CI, and the public README

The site does no live inference. Rollouts are captured once against spark-1 and
replayed at their recorded wall-clock — a public demo with no auth cannot hold
an API key, and a recorded run can be scrubbed, permalinked, blind-compared and
verified in ways a live one cannot. What stops it being a video is that the
browser re-derives every number from the recorded moves.

verify_fixtures.py is the Python half of that: it replays every committed
fixture through the engine and reproduces its own rewards. All 16 land at
delta 0.0. A fixture that cannot be regenerated is a claim with no receipt.

First real measurement, thinking off, 8 seeds: solved 0/8. The model repeats
guesses it has already played, invents words (trape, slith, postt, boomy),
and contradicts its own feedback — consistency 0.09 to 0.17. That is the
published failure taxonomy showing up in our own data on the first run, and it
is why `consistency` is a reward component rather than a footnote.

A capture failure is recorded as a turn with a null reply, never dropped. A
capture that silently discarded failed turns would be reporting a better model
than the one that ran.

CI gates both halves and four things that fail silently in production: the word
lists must rebuild byte-identically, the prerendered routes must carry their own
baked og tags (crawlers do not run JS, so without them every shared link
previews as the homepage), no blob: URL may reach the bundle (the site's CSP has
no worker-src, so it falls back to default-src 'self' and a blob worker is
blocked with no error), and the conformance digest must match across languages.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019mt6sHQHEnEYrJZvoMCJSB

public/traces/wordle/solver-s3.json

@@ -0,0 +1,68 @@
+{
+  "runId": "solver-s3",
+  "seed": 3,
+  "model": "entropy-solver",
+  "capturedAt": "2026-08-28",
+  "rewards": {
+    "solved": 1.0,
+    "economy": 1.0,
+    "consistency": 0.6666666666666666
+  },
+  "metrics": {
+    "guesses_used": 3.0,
+    "rejected_replies": 0.0,
+    "reference_depth": 3.0,
+    "turns_granted": 6.0,
+    "inconsistent_guesses": 1.0
+  },
+  "truncated": false,
+  "outcome": "solved",
+  "answer": "toady",
+  "turns": [
+    {
+      "reply": "[tares]",
+      "reasoning": null,
+      "call": {
+        "promptTokens": null,
+        "completionTokens": null,
+        "reasoningTokens": null,
+        "durationMs": null,
+        "finishReason": "generated"
+      },
+      "info": {
+        "guess": "tares",
+        "observation": "T A R E S\nG Y X X X\n\nYou have 5 guesses left."
+      }
+    },
+    {
+      "reply": "[bland]",
+      "reasoning": null,
+      "call": {
+        "promptTokens": null,
+        "completionTokens": null,
+        "reasoningTokens": null,
+        "durationMs": null,
+        "finishReason": "generated"
+      },
+      "info": {
+        "guess": "bland",
+        "observation": "B L A N D\nX X G X Y\n\nYou have 4 guesses left."
+      }
+    },
+    {
+      "reply": "[toady]",
+      "reasoning": null,
+      "call": {
+        "promptTokens": null,
+        "completionTokens": null,
+        "reasoningTokens": null,
+        "durationMs": null,
+        "finishReason": "generated"
+      },
+      "info": {
+        "guess": "toady",
+        "observation": "T O A D Y\nG G G G G\n\nYou have 3 guesses left."
+      }
+    }
+  ]
+}