sdks/typescript: replace Date/number duration types with Temporal

[Copilot]

Replaces Date and numeric duration types with Temporal.Instant and Temporal.Duration for type-safe temporal operations.

API Changes

• TaskContext.sleepFor(name, duration): duration changed from number (seconds) to Temporal.Duration
• TaskContext.sleepUntil(name, wakeAt): wakeAt changed from Date to Temporal.Instant
• TaskContext.awaitEvent(name, options): options.timeout changed from number (seconds) to Temporal.Duration
• CancellationPolicy: maxDuration and maxDelay changed from number (seconds) to Temporal.Duration

Implementation

• Added temporal-polyfill dependency for universal Temporal API support
• SQLite datetime codec handles both ISO strings and epoch milliseconds for database compatibility
• Re-exported Temporal from package root for consumer convenience

Usage Example

import { Temporal } from "@absurd-sqlite/sdk";

// Before
await ctx.sleepFor("wait", 60);
await ctx.awaitEvent("ready", { timeout: 120 });
await spawn("task", params, { 
  cancellation: { maxDuration: 3600 } 
});

// After
await ctx.sleepFor("wait", Temporal.Duration.from({ seconds: 60 }));
await ctx.awaitEvent("ready", { 
  timeout: Temporal.Duration.from({ minutes: 2 }) 
});
await spawn("task", params, { 
  cancellation: { 
    maxDuration: Temporal.Duration.from({ hours: 1 }) 
  } 
});

Original prompt

---

This section details on the original issue you should resolve

<issue_title>sdks/typescript: replace datetime / untyped duration types with Temporal</issue_title>
<issue_description>Refs:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal#browser_compatibility
• Temporal support (TC39 stage 3 proposal) oven-sh/bun#15853
• https://github.com/fullcalendar/temporal-polyfill</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes sdks/typescript: replace datetime / untyped duration types with Temporal #22

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