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/plugin/chat-message.test.ts

@@ -709,7 +709,7 @@ describe("createChatMessageHandler - TUI variant passthrough", () => {
       shouldOverride: false,
       pluginConfig: {
         agents: {
-          sisyphus: { model: "anthropic/claude-opus-4-6" },
+          sisyphus: { model: "anthropic/claude-opus-4-7" },
         },
       },
     })
@@ -733,7 +733,7 @@ describe("createChatMessageHandler - TUI variant passthrough", () => {
       shouldOverride: false,
       pluginConfig: {
         agents: {
-          prometheus: { model: "anthropic/claude-opus-4-6" },
+          prometheus: { model: "anthropic/claude-opus-4-7" },
         },
       },
     })
@@ -753,7 +753,7 @@ describe("createChatMessageHandler - TUI variant passthrough", () => {
   test("respects a mid-conversation model switch instead of reusing the previous stored model", async () => {
     //#given
     setMainSession("test-session")
-    setSessionModel("test-session", { providerID: "anthropic", modelID: "claude-opus-4-6" })
+    setSessionModel("test-session", { providerID: "anthropic", modelID: "claude-opus-4-7" })
     const args = createMockHandlerArgs({ shouldOverride: false })
     const handler = createChatMessageHandler(args)
     const nextModel = { providerID: "openai", modelID: "gpt-5.4" }