refactor(models): bump claude-opus-4-6 to claude-opus-4-7 across fallback chains, categories, and hooks

Updates the canonical Anthropic Opus model in every fallback chain
(sisyphus, oracle, prometheus, metis, momus, visual-engineering,
ultrabrain, deep, artistry, unspecified-high), the unspecified-high
category default, the think-mode HIGH_VARIANT_MAP, the Claude Code
alias map, the claude-thinking legacy alias, the context-limit GA
regex, and event.ts fallback strings.

Widens supportsCachedAnthropicLimit to accept both claude-*-4-6 and
claude-*-4-7 so the 1M context cache still applies across the bump.

Regenerates the bundled model-capabilities snapshot from models.dev
and the model-fallback snapshot to match the new source output.

src/shared/model-availability.ts

@@ -21,7 +21,7 @@ import { normalizeSDKResponse } from "./normalize-sdk-response"
  * If providers array is given, only models starting with "provider/" are considered.
  * 
  * @example
- * const available = new Set(["openai/gpt-5.4", "openai/gpt-5.3-codex", "anthropic/claude-opus-4-6"])
+ * const available = new Set(["openai/gpt-5.4", "openai/gpt-5.3-codex", "anthropic/claude-opus-4-7"])
  * fuzzyMatchModel("gpt-5.4", available) // → "openai/gpt-5.4"
  * fuzzyMatchModel("claude", available, ["openai"]) // → null (provider filter excludes anthropic)
  */