diff --git a/.github/workflows/wiki-sync.yml b/.github/workflows/wiki-sync.yml
index 02d1508..61c205b 100644
--- a/.github/workflows/wiki-sync.yml
+++ b/.github/workflows/wiki-sync.yml
@@ -6,6 +6,9 @@ on:
     paths:
       - '.wiki/**'
 
+permissions:
+  contents: write
+
 jobs:
   sync:
     name: Sync wiki to GitHub Wiki
diff --git a/.wiki/Architecture.md b/.wiki/Architecture.md
index ee9f0de..c5a952b 100644
--- a/.wiki/Architecture.md
+++ b/.wiki/Architecture.md
@@ -4,7 +4,7 @@
 
 The TC39 Temporal proposal (Stage 3, actively shipping in browsers) replaces the legacy `Date` object with a family of types: `PlainDate`, `PlainTime`, `PlainDateTime`, `ZonedDateTime`, `Instant`, and more. Central to its design is an extensible calendar system.
 
-A `Temporal.PlainDate` always stores its fields (year, month, day) in terms of a specific calendar. The ISO 8601 (Gregorian) calendar is the default. Custom calendars implement an interface — informally called the Temporal Calendar Protocol — that lets the `PlainDate` compute calendar-specific values from those fields, perform arithmetic, and convert between calendar systems.
+A `Temporal.PlainDate` always stores its fields (year, month, day) in terms of a specific calendar. The ISO 8601 (Gregorian) calendar is the default. Custom calendars implement an interface (informally called the Temporal Calendar Protocol) that lets the `PlainDate` compute calendar-specific values from those fields, perform arithmetic, and convert between calendar systems.
 
 `temporal-hijri` implements this protocol for the Hijri (Islamic) calendar.
 
@@ -26,7 +26,7 @@ mergeFields(fields, additionalFields)
 toString()
 ```
 
-`HijriCalendar` implements all of these. The key challenge is that `Temporal.PlainDate` stores ISO coordinates (Gregorian year/month/day), while the methods must return Hijri coordinates — and `dateFromFields` must do the reverse.
+`HijriCalendar` implements all of these. The key challenge is that `Temporal.PlainDate` stores ISO coordinates (Gregorian year/month/day), while the methods must return Hijri coordinates. `dateFromFields` does the reverse.
 
 ## Coordinate Bridging
 
@@ -49,7 +49,7 @@ The inverse path:
 
 ### Date object construction
 
-The UAQ engine reads local date components (`getFullYear`, `getMonth`, `getDate`). To ensure the local date always matches the intended calendar date — regardless of the host's timezone — `toHijri()` uses the local `Date` constructor: `new Date(year, month - 1, day)`. This avoids the UTC-to-local shift that would occur with `Date.UTC`.
+The UAQ engine reads local date components (`getFullYear`, `getMonth`, `getDate`). To ensure the local date always matches the intended calendar date regardless of the host's timezone, `toHijri()` uses the local `Date` constructor: `new Date(year, month - 1, day)`. This avoids the UTC-to-local shift that would occur with `Date.UTC`.
 
 The FCNA engine reads UTC components for its astronomical calculations. The UTC-local discrepancy is at most one day, which falls within the tolerance of FCNA's calculation window.
 
@@ -57,7 +57,7 @@ The FCNA engine reads UTC components for its astronomical calculations. The UTC-
 
 Adding a duration to a Hijri date requires different handling for different duration components:
 
-- **Years and months** must be applied in Hijri space. Adding "1 month" to 1 Ramadan should yield 1 Shawwal — not a fixed 30-day offset. The Hijri calendar has months of 29 and 30 days in no fixed pattern, so month arithmetic must account for actual month lengths.
+- **Years and months** must be applied in Hijri space. Adding "1 month" to 1 Ramadan should yield 1 Shawwal, not a fixed 30-day offset. The Hijri calendar has months of 29 and 30 days in no fixed pattern, so month arithmetic must account for actual month lengths.
 
 - **Days and weeks** can be applied in ISO (Gregorian) space after the Hijri-space year/month addition. Adding 7 days means exactly 7 days, and ISO arithmetic handles that correctly.
 
@@ -72,7 +72,7 @@ The implementation:
 6. Apply the day and week delta with ISO PlainDate.add().
 ```
 
-Clamping (step 4) follows the Temporal specification's "constrain" overflow behavior. Adding 1 month to 30 Rajab (a 30-day month) where Shaban is 29 days would yield 30 Shaban — instead, the result is clamped to 29 Shaban.
+Clamping (step 4) follows the Temporal specification's "constrain" overflow behavior. Adding 1 month to 30 Rajab (a 30-day month) where Shaban is 29 days would yield 30 Shaban. The result is clamped to 29 Shaban.
 
 ## dateUntil: Difference Strategy
 
@@ -107,7 +107,7 @@ hijri-core provides:
 - Built-in UAQ engine (table-driven, Hijri years 1318-1500)
 - Built-in FCNA engine (Meeus Chapter 49 astronomical calculations)
 
-`temporal-hijri` is a pure adapter layer. It does not implement any calendar arithmetic itself — it translates between the Temporal protocol and hijri-core's engine interface.
+`temporal-hijri` is a pure adapter layer. It does not implement any calendar arithmetic itself. It translates between the Temporal protocol and hijri-core's engine interface.
 
 ## Build Output
 
diff --git a/.wiki/Home.md b/.wiki/Home.md
index 9954267..ecfc046 100644
--- a/.wiki/Home.md
+++ b/.wiki/Home.md
@@ -6,15 +6,15 @@ This package provides `UaqCalendar` and `FcnaCalendar` as plug-in calendar objec
 
 ## Pages
 
-- [Home](Home) — you are here
-- [API Reference](API-Reference) — full method signatures and return types
-- [Architecture](Architecture) — design decisions, protocol internals, arithmetic strategy
+- [Home](Home): you are here
+- [API Reference](API-Reference): full method signatures and return types
+- [Architecture](Architecture): design decisions, protocol internals, arithmetic strategy
 
 ## Quick links
 
 - [GitHub repository](https://github.com/acamarata/temporal-hijri)
 - [npm package](https://www.npmjs.com/package/temporal-hijri)
-- [hijri-core](https://github.com/acamarata/hijri-core) — the underlying calendar engine
+- [hijri-core](https://github.com/acamarata/hijri-core): the underlying calendar engine
 
 ## Calendar systems
 
@@ -27,7 +27,7 @@ This package provides `UaqCalendar` and `FcnaCalendar` as plug-in calendar objec
 
 - Node.js 20+
 - `hijri-core ^1.0.0` (peer dependency)
-- `@js-temporal/polyfill ^0.4.0` (optional peer dependency — needed if native `Temporal` is unavailable)
+- `@js-temporal/polyfill ^0.4.0` (optional peer dependency, needed if native `Temporal` is unavailable)
 
 ---
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0d477a..b173c03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,8 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - `HijriCalendar` base class implementing the TC39 Temporal Calendar Protocol
-- `UaqCalendar` — Umm al-Qura calendar (table-driven, 1318-1500 AH coverage)
-- `FcnaCalendar` — FCNA/ISNA calendar (astronomical new moon calculation via Meeus)
+- `UaqCalendar`: Umm al-Qura calendar (table-driven, 1318-1500 AH coverage)
+- `FcnaCalendar`: FCNA/ISNA calendar (astronomical new moon calculation via Meeus)
 - `uaqCalendar` and `fcnaCalendar` convenience singletons
 - Full Temporal protocol: `year`, `month`, `monthCode`, `day`, `daysInMonth`, `daysInYear`, `monthsInYear`, `inLeapYear`, `dayOfWeek`, `dayOfYear`, `weekOfYear`, `daysInWeek`, `dateFromFields`, `yearMonthFromFields`, `monthDayFromFields`, `dateAdd`, `dateUntil`, `mergeFields`, `toString`
 - Dual CJS and ESM builds with TypeScript declarations
diff --git a/README.md b/README.md
index 10aadbe..ec87265 100644
--- a/README.md
+++ b/README.md
@@ -175,7 +175,7 @@ The package ships dual CJS/ESM builds with full `.d.ts` and `.d.mts` declaration
 
 - Node.js 20, 22, 24
 - Any bundler supporting `exports` field (`Vite`, `Webpack 5`, `Rollup`, `esbuild`)
-- ESM (`import`) and CommonJS (`require`) — both provided
+- ESM (`import`) and CommonJS (`require`): both provided
 - No native `Temporal` required: works entirely with `@js-temporal/polyfill`
 
 ---
@@ -188,9 +188,9 @@ Full reference, architecture notes, and algorithmic detail in the [wiki](https:/
 
 ## Related
 
-- [hijri-core](https://github.com/acamarata/hijri-core) — the zero-dependency Hijri engine powering this package
-- [luxon-hijri](https://github.com/acamarata/luxon-hijri) — Hijri/Gregorian conversion for Luxon
-- [pray-calc](https://github.com/acamarata/pray-calc) — Islamic prayer times
+- [hijri-core](https://github.com/acamarata/hijri-core): zero-dependency Hijri engine powering this package
+- [luxon-hijri](https://github.com/acamarata/luxon-hijri): Hijri/Gregorian conversion for Luxon
+- [pray-calc](https://github.com/acamarata/pray-calc): Islamic prayer times
 
 ---
 
diff --git a/package.json b/package.json
index 7f61ce9..5dd9398 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
   "devDependencies": {
     "@js-temporal/polyfill": "^0.4.4",
     "@types/node": "^22.0.0",
-    "hijri-core": "file:../hijri-core",
+    "hijri-core": "^1.0.0",
     "tsup": "^8.0.0",
     "typescript": "^5.5.0"
   },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7cc7590..676a6e8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -15,8 +15,8 @@ importers:
         specifier: ^22.0.0
         version: 22.19.11
       hijri-core:
-        specifier: file:../hijri-core
-        version: file:../hijri-core
+        specifier: ^1.0.0
+        version: 1.0.0
       tsup:
         specifier: ^8.0.0
         version: 8.5.1(typescript@5.9.3)
@@ -407,8 +407,8 @@ packages:
     engines: {node: ^8.16.0 || ^10.6.0 || >=11.0.0}
     os: [darwin]
 
-  hijri-core@file:../hijri-core:
-    resolution: {directory: ../hijri-core, type: directory}
+  hijri-core@1.0.0:
+    resolution: {integrity: sha512-wImBZLBKbEWEEUE1nrc1CFY/uvx4XjGNWYChImJZlswXIVhrBCzSVaj6DP1AU2gUMJ6KDh2ygXo/u/Qx232CXA==}
     engines: {node: '>=20'}
 
   joycon@3.1.1:
@@ -803,7 +803,7 @@ snapshots:
   fsevents@2.3.3:
     optional: true
 
-  hijri-core@file:../hijri-core: {}
+  hijri-core@1.0.0: {}
 
   joycon@3.1.1: {}
 
diff --git a/src/calendars/HijriCalendar.ts b/src/calendars/HijriCalendar.ts
index 6fab0d2..9a9f946 100644
--- a/src/calendars/HijriCalendar.ts
+++ b/src/calendars/HijriCalendar.ts
@@ -1,7 +1,7 @@
 import { Temporal } from '@js-temporal/polyfill';
 import type { CalendarEngine } from 'hijri-core';
 
-type DateUnit = 'year' | 'years' | 'month' | 'months' | 'week' | 'weeks' | 'day' | 'days' | 'auto';
+type DateUnit = 'year' | 'years' | 'month' | 'months' | 'week' | 'weeks' | 'day' | 'days';
 
 /**
  * Base class implementing the TC39 Temporal Calendar Protocol for Hijri calendars.
@@ -146,6 +146,7 @@ export class HijriCalendar {
     return total;
   }
 
+  /** Hijri week number counted from day 1 of Muharram (day 1-7 = week 1). No ISO week alignment. */
   weekOfYear(date: Temporal.PlainDate): number {
     return Math.ceil(this.dayOfYear(date) / 7);
   }
@@ -163,6 +164,11 @@ export class HijriCalendar {
     return this.fromHijri(fields.year, fields.month, fields.day);
   }
 
+  /**
+   * ISO-anchored PlainYearMonth per the Temporal Calendar Protocol.
+   * The resulting PlainYearMonth stores ISO coordinates internally, representing
+   * the Hijri month that starts on that ISO year/month.
+   */
   yearMonthFromFields(
     fields: { year: number; month: number },
     _options?: { overflow?: 'constrain' | 'reject' }
@@ -174,6 +180,11 @@ export class HijriCalendar {
     });
   }
 
+  /**
+   * ISO-anchored PlainMonthDay per the Temporal Calendar Protocol.
+   * Reference year 1444 is intentional: it is a recent, well-covered UAQ year
+   * used to anchor the ISO coordinates when no year is supplied.
+   */
   monthDayFromFields(
     fields: { month: number; day: number; year?: number },
     _options?: { overflow?: 'constrain' | 'reject' }
diff --git a/src/index.ts b/src/index.ts
index 359a2c5..52d3e11 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,9 +3,8 @@ export { UaqCalendar } from './calendars/UaqCalendar';
 export { FcnaCalendar } from './calendars/FcnaCalendar';
 
 export type { HijriDate, CalendarEngine, ConversionOptions } from 'hijri-core';
-export type { HijriCalendarOptions } from './types';
 
-// Convenience singletons — ready to use without instantiation.
+// Pre-built singletons. Import and use directly; no need to instantiate.
 import { UaqCalendar } from './calendars/UaqCalendar';
 import { FcnaCalendar } from './calendars/FcnaCalendar';
 
diff --git a/src/types.ts b/src/types.ts
index 0188add..f47c7ee 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,5 +1 @@
 export type { HijriDate, CalendarEngine, ConversionOptions } from 'hijri-core';
-
-export interface HijriCalendarOptions {
-  calendar?: string;
-}