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/agents/dynamic-agent-prompt-builder.test.ts

@@ -211,7 +211,7 @@ describe("buildParallelDelegationSection", () => {
 
   it("#given Claude model #when building #then returns empty", () => {
     //#given
-    const model = "anthropic/claude-opus-4-6"
+    const model = "anthropic/claude-opus-4-7"
     const categories = [deepCategory]
 
     //#when