chore(conductor): Add new track 'Fix RRULE object mapping'

conductor/tracks.md

@@ -11,3 +11,8 @@ This file tracks all major tracks for the project. Each track has its own detail
 
 - [x] **Track: Fix TypeError: r.replace is not a function in icalendar.ts**
   *Link: [./tracks/fix_rrule_type_error_20260219/](./tracks/fix_rrule_type_error_20260219/)*
+
+---
+
+- [ ] **Track: Fix RRULE object expansion error by correctly mapping object keys to standard iCalendar RRULE properties.**
+  *Link: [./tracks/fix_rrule_object_mapping_20260219/](./tracks/fix_rrule_object_mapping_20260219/)*

conductor/tracks/fix_rrule_object_mapping_20260219/index.md

@@ -0,0 +1,5 @@
+# Track fix_rrule_object_mapping_20260219 Context
+
+- [Specification](./spec.md)
+- [Implementation Plan](./plan.md)
+- [Metadata](./metadata.json)

conductor/tracks/fix_rrule_object_mapping_20260219/metadata.json

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+{
+  "track_id": "fix_rrule_object_mapping_20260219",
+  "type": "bug",
+  "status": "new",
+  "created_at": "2026-02-19T00:00:00Z",
+  "updated_at": "2026-02-19T00:00:00Z",
+  "description": "Fix RRULE object expansion error by correctly mapping object keys to standard iCalendar RRULE properties."
+}

conductor/tracks/fix_rrule_object_mapping_20260219/plan.md

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+# Implementation Plan - Fix RRULE Object Mapping
+
+## Phase 1: Reproduction
+- [ ] Task: Reproduce `Unknown RRULE property` error
+    - [ ] Modify the test case in `icalendar_test.ts` to use `frequency` instead of `freq` in the mock object.
+    - [ ] Run the test and confirm it fails with the expected error.
+- [ ] Task: Conductor - User Manual Verification 'Reproduction' (Protocol in workflow.md)
+
+## Phase 2: Fix Implementation
+- [ ] Task: Implement mapping logic in `icalendar.ts`
+    - [ ] Create a mapping object for verbose keys to iCal keys.
+    - [ ] Update `expandRecurrences` to use this mapping.
+    - [ ] Run the test to confirm it passes.
+- [ ] Task: Conductor - User Manual Verification 'Fix Implementation' (Protocol in workflow.md)
+
+## Phase 3: Verification & Cleanup
+- [ ] Task: Full Regression Check
+    - [ ] Run all tests in `icalendar_test.ts`.
+- [ ] Task: Conductor - User Manual Verification 'Verification & Cleanup' (Protocol in workflow.md)

conductor/tracks/fix_rrule_object_mapping_20260219/spec.md

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+# Specification: Fix RRULE Object Expansion Error
+
+## Overview
+The previous fix for handling object-type `rrule` properties (returned by `ts-ics`) introduced a regression. The conversion logic used uppercase full names (e.g., `FREQUENCY`), but the `rrule` library's `parseString` method expects standard iCalendar shortened keys (e.g., `FREQ`). This results in an `Error: Unknown RRULE property 'FREQUENCY'`.
+
+## Functional Requirements
+- **Correct Key Mapping:** The logic that converts an `rrule` object back to a string must use standard iCalendar RRULE property keys.
+- **Mapping Table:** 
+    - `frequency` -> `FREQ`
+    - `until` -> `UNTIL`
+    - `count` -> `COUNT`
+    - `interval` -> `INTERVAL`
+    - `bysecond` -> `BYSECOND`
+    - `byminute` -> `BYMINUTE`
+    - `byhour` -> `BYHOUR`
+    - `byday` -> `BYDAY`
+    - `bymonthday` -> `BYMONTHDAY`
+    - `byyearday` -> `BYYEARDAY`
+    - `byweekno` -> `BYWEEKNO`
+    - `bymonth` -> `BYMONTH`
+    - `bysetpos` -> `BYSETPOS`
+    - `wkst` -> `WKST`
+- **Case Insensitivity:** The mapping should be case-insensitive for the input object keys.
+
+## Implementation Steps
+1.  **Reproduce:** Update the existing `expandRecurrences - object rrule` test case to use the key `frequency` and verify it fails with the reported error.
+2.  **Fix:** Implement a mapping function in `icalendar.ts` to translate object keys to standard RRULE keys before stringifying.
+3.  **Verify:** Run the test case to confirm it now passes.
+
+## Acceptance Criteria
+- [ ] Test `expandRecurrences - object rrule` passes with an object using `frequency` key.
+- [ ] No "Unknown RRULE property" errors are logged for valid RRULE objects.