ppoppo-clock 1.0.0

Universal Clock + Timer port for ppoppo workspace — chat-as-infrastructure primitive
Documentation 
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# ppoppo-clock

The time port of the ppoppo ecosystem: one `Clock` ("what time is it?") and
one `Timer` ("wake me in N ms"), injected wherever code needs time, so no
surface reads the ambient system clock directly.

```rust
use ppoppo_clock::ArcClock;

fn stamp(clock: &ArcClock) -> i64 {
    clock.now_unix_millis()
}
```

| Feature | Arm |
|---|---|
| `native` | `native::{WallClock, TokioTimer, system_tz}` — the Tokio runtime |
| `wasm` | `wasm::{WasmClock, WasmTimer, browser_local_tz}` — the browser event loop |
| `mock` | `mock::{FrozenClock, MockClock, AdvanceableTimer, frozen_at, mock_pair}` — deterministic tests |

With no feature the crate is the two traits and their `Arc` aliases — no
runtime, no IO. The port's value types are [jiff](https://docs.rs/jiff)'s
(`Timestamp`, `Zoned`, `tz::TimeZone`, `civil::Date`), re-exported as
`ppoppo_clock::jiff` so a consumer names one version of them.