docs: fix yearly recurrence format and clarify sort/limitations

- Fix `REM Mon DD` → `REM MMM DD` in yearly recurrence table
- Clarify `--sort original` preserves processing order in CLI reference
- Update `RELATED=END` trigger behaviour (treated as `RELATED=START`)
- Remove unsupported EXDATE/RDATE+override limitation (now handled)
- Fix `--sort none` → `--sort original` in CLI help text
- Remove EXDATE/RDATE/override guard from `simple_recurrence`

README.md

@@ -14,7 +14,7 @@ Full RFC 5545 coverage is intentionally out of scope — see [Limitations](#limi
 | All-day single | `REM YYYY-MM-DD MSG …` |
 | All-day multi-day | `REM date THROUGH date MSG …` |
 | Timed event (UTC, local, TZID) | `REM date AT HH:MM DURATION HH:MM MSG …` |
-| Yearly recurrence (`FREQ=YEARLY`) | `REM Mon DD MSG …` |
+| Yearly recurrence (`FREQ=YEARLY`) | `REM MMM DD MSG …` |
 | Weekly recurrence (`FREQ=WEEKLY`) | `REM Mon Wed FROM … UNTIL … MSG …` |
 | Daily recurrence (`FREQ=DAILY`) | `REM date *N UNTIL … MSG …` |
 | Monthly by day-of-month (`BYMONTHDAY`) | `REM N FROM … UNTIL … MSG …` |
@@ -115,7 +115,7 @@ ical2rem --verbose personal.ics > personal.rem
 |---|---|
 | `FILE…` | One or more `.ics` files to convert |
 | `-z`, `--timezone TZ` | Target timezone for output (default: local) |
-| `--sort asc\|desc\|original` | Sort order by date (default: `desc`) |
+| `--sort asc\|desc\|original` | Sort order by date (default: `desc`); `original` preserves processing order (sorted by UID within each file, last file first) |
 | `--source NAME` | Override calendar name (single file only) |
 | `-v`, `--verbose` | Print diagnostic messages on stderr |
 | `--no-uuid` | Omit `INFO "UID: …"` lines |
@@ -184,14 +184,13 @@ REM \
 - `BYSETPOS`: **not supported**.
 - `FREQ=YEARLY` with `BYMONTH`/`BYDAY` variants: **not supported**, only simple yearly (same day every year).
 - `RDATE` (additional isolated dates): **not supported**, warning emitted.
-- Recurring events that have both EXDATE/RDATE and override occurrences (`RECURRENCE-ID`): **not supported**, event skipped with warning.
 
 ### Alarms (`VALARM`)
 
 - `ACTION:EMAIL`: ignored silently.
 - `TRIGGER;VALUE=DATE-TIME` (absolute datetime trigger): ignored silently.
 - Positive triggers (after the event): ignored silently.
-- `RELATED=END` triggers: **not implemented**.
+- `RELATED=END` triggers: the offset is applied as if it were `RELATED=START` (no warning emitted).
 - `REPEAT`/`DURATION` (repeating alarms) on all-day events: ignored.
 
 ### Other