Reduce internal-only labeling noise in source comments (#355)

This pass rewrites comment-only ANT-ONLY markers to neutral internal-only
language across the source tree without changing runtime strings, flags,
commands, or protocol identifiers. The goal is to lower obvious internal
prose leakage while keeping the diff mechanically safe and easy to review.

Constraint: Phase B is limited to comments/prose only; runtime strings and user-facing labels remain deferred
Rejected: Broad search-and-replace across strings and command descriptions | too risky for a prose-only pass
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Remaining ANT-ONLY hits are mostly runtime/user-facing strings and should be handled separately from comment cleanup
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/api/claude.ts

@@ -463,7 +463,7 @@ function configureEffortParams(
     outputConfig.effort = effortValue
     betas.push(EFFORT_BETA_HEADER)
   } else if (process.env.USER_TYPE === 'ant') {
-    // Numeric effort override - ant-only (uses anthropic_internal)
+    // Numeric effort override - internal-only (uses anthropic_internal)
     const existingInternal =
       (extraBodyParams.anthropic_internal as Record<string, unknown>) || {}
     extraBodyParams.anthropic_internal = {
@@ -1195,7 +1195,7 @@ async function* queryModel(
   // Determine if cached microcompact is enabled for this model.
   // Computed once here (in async context) and captured by paramsFromContext.
   // The beta header is also captured here to avoid a top-level import of the
-  // ant-only CACHE_EDITING_BETA_HEADER constant.
+  // internal-only CACHE_EDITING_BETA_HEADER constant.
   let cachedMCEnabled = false
   let cacheEditingBetaHeader = ''
   if (feature('CACHED_MICROCOMPACT')) {