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/features/background-agent/task-poller.test.ts

@@ -648,7 +648,7 @@ describe("checkAndInterruptStaleTasks", () => {
     const task = createRunningTask({
       startedAt: new Date(Date.now() - 15 * 60 * 1000),
       progress: undefined,
-      concurrencyKey: "anthropic/claude-opus-4-6",
+      concurrencyKey: "anthropic/claude-opus-4-7",
     })
 
     //#when
@@ -661,7 +661,7 @@ describe("checkAndInterruptStaleTasks", () => {
     })
 
     //#then
-    expect(releaseMock).toHaveBeenCalledWith("anthropic/claude-opus-4-6")
+    expect(releaseMock).toHaveBeenCalledWith("anthropic/claude-opus-4-7")
     expect(task.concurrencyKey).toBeUndefined()
   })