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/cli/update.ts

@@ -30,7 +30,7 @@ import { getInitialSettings } from 'src/utils/settings/settings.js'
 
 export async function update() {
   // Block updates for third-party providers. The update mechanism downloads
-  // from Anthropic's distribution bucket, which would silently replace the
+  // from the first-party distribution bucket, which would silently replace the
   // OpenClaude build (with the OpenAI shim) with the upstream Claude Code
   // binary (without it).
   if (getAPIProvider() !== 'firstParty') {