docs: clarify inline code comments

Comment-only follow-up documenting reusable gateway, auth, proxy, device, Talk, session, and agent helper contracts.\n\nVerification: git diff --check plus targeted tests recorded in PR body.

packages/normalization-core/src/string-normalization.ts

@@ -1,41 +1,50 @@
 import { normalizeOptionalLowercaseString, normalizeOptionalString } from "./string-coerce.js";
 
+/** Coerces entries to strings, trims them, and drops empty results. */
 export function normalizeStringEntries(list?: ReadonlyArray<unknown>) {
   return (list ?? []).map((entry) => normalizeOptionalString(String(entry)) ?? "").filter(Boolean);
 }
 
+/** Normalizes string entries and lowercases each retained value. */
 export function normalizeStringEntriesLower(list?: ReadonlyArray<unknown>) {
   return normalizeStringEntries(list).map((entry) => normalizeOptionalLowercaseString(entry) ?? "");
 }
 
+/** Returns first-seen unique values while preserving insertion order. */
 export function uniqueValues<T>(values: Iterable<T>): T[] {
   return [...new Set(values)];
 }
 
+/** Returns first-seen unique strings while preserving insertion order. */
 export function uniqueStrings(values: Iterable<string>): string[] {
   return uniqueValues(values);
 }
 
+/** Returns unique strings sorted with stable ASCII comparison. */
 export function sortUniqueStrings(values: Iterable<string>): string[] {
   return uniqueStrings(values).toSorted((left, right) =>
     left < right ? -1 : left > right ? 1 : 0,
   );
 }
 
+/** Normalizes entries, removes duplicates, and preserves first-seen order. */
 export function normalizeUniqueStringEntries(values?: Iterable<unknown>): string[] {
   return uniqueStrings(normalizeStringEntries(values ? [...values] : undefined));
 }
 
+/** Lowercases normalized entries, removes empties/duplicates, and preserves first-seen order. */
 export function normalizeUniqueStringEntriesLower(values?: Iterable<unknown>): string[] {
   return uniqueStrings(
     normalizeStringEntriesLower(values ? [...values] : undefined).filter(Boolean),
   );
 }
 
+/** Normalizes entries, removes duplicates, and returns sorted output. */
 export function normalizeSortedUniqueStringEntries(values?: Iterable<unknown>): string[] {
   return sortUniqueStrings(normalizeUniqueStringEntries(values));
 }
 
+/** Normalizes array-backed string lists and rejects non-array input as empty. */
 export function normalizeTrimmedStringList(value: unknown): string[] {
   if (!Array.isArray(value)) {
     return [];
@@ -46,19 +55,23 @@ export function normalizeTrimmedStringList(value: unknown): string[] {
   });
 }
 
+/** Normalizes an array-backed string list and removes duplicates. */
 export function normalizeUniqueTrimmedStringList(value: unknown): string[] {
   return uniqueStrings(normalizeTrimmedStringList(value));
 }
 
+/** Normalizes an array-backed string list, removes duplicates, and sorts it. */
 export function normalizeSortedUniqueTrimmedStringList(value: unknown): string[] {
   return sortUniqueStrings(normalizeTrimmedStringList(value));
 }
 
+/** Returns undefined instead of an empty normalized array-backed string list. */
 export function normalizeOptionalTrimmedStringList(value: unknown): string[] | undefined {
   const normalized = normalizeTrimmedStringList(value);
   return normalized.length > 0 ? normalized : undefined;
 }
 
+/** Returns undefined for non-arrays but preserves an empty array for explicit arrays. */
 export function normalizeArrayBackedTrimmedStringList(value: unknown): string[] | undefined {
   if (!Array.isArray(value)) {
     return undefined;
@@ -66,6 +79,7 @@ export function normalizeArrayBackedTrimmedStringList(value: unknown): string[]
   return normalizeTrimmedStringList(value);
 }
 
+/** Normalizes either a single string-like value or an array-backed string list. */
 export function normalizeSingleOrTrimmedStringList(value: unknown): string[] {
   if (Array.isArray(value)) {
     return normalizeTrimmedStringList(value);
@@ -74,10 +88,12 @@ export function normalizeSingleOrTrimmedStringList(value: unknown): string[] {
   return normalized ? [normalized] : [];
 }
 
+/** Normalizes single-or-array string input and removes duplicates. */
 export function normalizeUniqueSingleOrTrimmedStringList(value: unknown): string[] {
   return uniqueStrings(normalizeSingleOrTrimmedStringList(value));
 }
 
+/** Parses either array entries or comma-separated string entries into trimmed values. */
 export function normalizeCsvOrLooseStringList(value: unknown): string[] {
   if (Array.isArray(value)) {
     return normalizeStringEntries(value);
@@ -95,6 +111,7 @@ function normalizeSlugInput(raw?: string | null) {
   return (normalizeOptionalLowercaseString(raw) ?? "").normalize("NFC");
 }
 
+/** Normalizes user-facing names into permissive lowercase hyphen slugs. */
 export function normalizeHyphenSlug(raw?: string | null) {
   const trimmed = normalizeSlugInput(raw);
   if (!trimmed) {
@@ -105,6 +122,7 @@ export function normalizeHyphenSlug(raw?: string | null) {
   return cleaned.replace(/-{2,}/g, "-").replace(/^[-.]+|[-.]+$/g, "");
 }
 
+/** Normalizes @/#-prefixed names into lowercase hyphen slugs without the prefix. */
 export function normalizeAtHashSlug(raw?: string | null) {
   const trimmed = normalizeSlugInput(raw);
   if (!trimmed) {