docs: continue inline comment pass (#88849)

Adds broad inline comments and JSDoc for CLI, cron, outbound/channel, plugin SDK, ACP, shared helpers, net policy, and related utility contracts. Proof: git diff --check on latest exact head plus focused cron tests passed; CI had no failing checks observed before merge attempt.

src/shared/string-sample.ts

@@ -1,3 +1,4 @@
+/** Formats a bounded comma-separated sample of string entries with a hidden-count suffix. */
 export function summarizeStringEntries(params: {
   entries?: ReadonlyArray<string> | null;
   limit?: number;