diff --git a/PLAN.md b/PLAN.md
deleted file mode 100644
index 91a8283..0000000
--- a/PLAN.md
+++ /dev/null
@@ -1,87 +0,0 @@
-# Timezone Support
-
-## Goal
-
-Add timezone conversion to the `format` pipe so dates display in the configured site timezone, with correct abbreviations for the `MST` token.
-
-## Context
-
-Dates are stored as raw ISO 8601 strings. The `format` pipe formats them for display using Go-style layout tokens. Currently `parse_iso_date` ignores the timezone offset suffix, and `MST` is hardcoded to `"UTC"`.
-
-Pipes now take `ctx: []any`, so timezone config can flow through the data context identically to `date_format` — no new parameters to thread.
-
-## Decisions
-
-- **MST fallback** (no target tz, date has offset): `UTC-04:00` format
-- **`now` field**: intentionally UTC (offset=0). The `format` pipe handles timezone display.
-- **TZ_Region cache**: lives in the mustache package (`format.odin`)
-
-## Files changed
-
-| File | Changes |
-|---|---|
-| `mustache/format.odin` | Extend `Date_Components` (+`offset_seconds`, `has_offset`, `tz_abbr`). Extend `parse_iso_date` to parse trailing offset. Add `tz_cache`, `get_cached_tz`, `convert_to_tz`, `format_offset`, `destroy_tz_cache`. Fix MST token. Import `core:time/timezone`. |
-| `mustache/pipes.odin` | Resolve `date_timezone` from ctx in `"format"` case (optional — nil is fine). Add `timezone_name` param to `apply_format`. Orchestrates parse → convert → format. |
-| `render.odin` | Add `date_timezone: string` to `Base_Data`, populate from `site.date.timezone`. Remove `// TODO: CAlculate offset` (offset=0 is intentional — UTC). |
-| `site.odin` | Call `mustache.destroy_tz_cache()` from `destroy_site`. No structural changes — `Date_Preferences.timezone` already exists and flows through config. |
-| `mustache/pipes_test.odin` | Add `date_timezone: string` to test data structs. Add timezone conversion tests. |
-
-## Conversion logic (in `apply_format`)
-
-```
-1. parse_iso_date(iso) → components (now includes offset_seconds, has_offset)
-2. tz_name := resolve "date_timezone" from ctx (optional)
-3. target_tz := get_cached_tz(tz_name)   // nil if empty/UTC/not configured
-4. if target_tz != nil:
-       components = convert_to_tz(components, target_tz)
-       // tz_abbr filled by convert_to_tz via timezone.shortname()
-5. else if components.has_offset:
-       components.tz_abbr = format_offset(components.offset_seconds)
-       // e.g. "UTC-04:00"
-6. else:
-       components.tz_abbr = "UTC"
-7. format_date(components, fmt)
-```
-
-## `convert_to_tz` flow
-
-```
-1. Build DateTime from components (tz=nil=UTC)
-2. If has_offset: add offset_seconds to get true UTC
-3. timezone.datetime_to_tz(utc_dt, target_tz) → converted DateTime
-4. Extract components from converted DateTime
-5. tz_abbr = timezone.shortname(converted_dt)  // "EST", "EDT", etc.
-```
-
-## MST fallback: `format_offset`
-
-```
-0       → "UTC"
--14400  → "UTC-04:00"
-+19800  → "UTC+05:30"
-```
-
-## `now` field
-
-`now` stays UTC (offset=0). Remove the `// TODO: CAlculate offset` comment — it's correct as-is. Templates format it with `{{now | format}}` and the pipe handles timezone display.
-
-## Behavior matrix
-
-| Config TZ | ISO has offset | Conversion | `MST` output |
-|---|---|---|---|
-| `"America/New_York"` | yes (`-04:00`) | UTC → NY (DST-aware) | `"EST"`/`"EDT"` |
-| `"America/New_York"` | no | assume already in NY | `"EST"`/`"EDT"` |
-| not set | yes (`-04:00`) | none — display as-is | `"UTC-04:00"` |
-| not set | no | none | `"UTC"` |
-
-## Imports added
-
-- `mustache/format.odin`: `import "core:time/timezone"` (for `region_load`, `datetime_to_tz`, `shortname`, `region_destroy`)
-
-## Odin timezone API reference
-
-- `timezone.region_load(name: string) -> (^datetime.TZ_Region, bool)` — `"local"` reads `$TZ` env, falls back to `/etc/localtime`
-- `timezone.region_destroy(region: ^datetime.TZ_Region)`
-- `timezone.datetime_to_tz(dt: DateTime, tz: ^TZ_Region) -> (DateTime, bool)` — DST-aware. If `dt.tz == tz`, no-op. If `dt.tz == nil`, treats as UTC.
-- `timezone.shortname(dt: DateTime) -> (string, bool)` — abbreviation from TZ_Region records (e.g. `"EST"`, `"EDT"`)
-- `datetime.DateTime :: struct { using date: Date, using time: Time, tz: ^TZ_Region }` — `tz == nil` means UTC