Neutralize internal Anthropic prose in explanatory comments (#357)

This is a small prose-only follow-up that rewrites clearly internal or
explanatory Anthropic comment language to neutral wording in a handful of
high-confidence files. It avoids runtime strings, flags, command labels,
protocol identifiers, and provider-facing references.

Constraint: Keep this pass narrowly scoped to comments/documentation only
Rejected: Broader Anthropic comment sweep across functional API/protocol references | too ambiguous for a safe prose-only PR
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Leave functional Anthropic references (API behavior, SDKs, URLs, provider labels, protocol docs) for separate reviewed passes
Tested: bun run build
Tested: bun run smoke
Tested: bun run verify:privacy
Tested: bun run test:provider
Tested: bun run test:provider-recommendation
Not-tested: Full repo typecheck (upstream baseline remains noisy)

Co-authored-by: anandh8x <test@example.com>

src/services/mcp/officialRegistry.ts

@@ -36,7 +36,7 @@ export async function prefetchOfficialMcpUrls(): Promise<void> {
     return
   }
 
-  // Anthropic's official MCP registry is only relevant for first-party mode.
+  // The official first-party MCP registry is only relevant for first-party mode.
   if (getAPIProvider() !== 'firstParty') {
     return
   }