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docs: update serialization docs and skills for generator v4 (#2588)

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## Summary

Brings every serialization-related doc, skill, and the CLAUDE.md rule in line with generator **v4** (adopted in #2586/#2587). No code changes.

**Updated surface, everywhere it was referenced:**
- `[SerializableFieldSaveFlag(order)]` / `[SerializableFieldDefault(order)]` → `[SaveFlag(nameof(Should), nameof(Default))]` on the field (second method optional).
- `[TimerDrift]` + `[DeserializeTimerField(order)]` → `[DeserializeTimer(nameof(Method), wallClock)]` on the field, with the anchored-time semantics spelled out: drifting by default (downtime preserves the remaining delay, idle saves byte-stable), `wallClock: true` for absolute deadlines, restart method invoked **only when a timer was running** (no sentinel), and the timer `MigrateFrom` pattern (`XxxNext`/`XxxDelay`) for wire-format changes.
- New `[SerializableField]` documentation: the real signature (the documented `saveIf` parameter never existed) plus the setter hooks — `allowFieldChange` (`bool Method(ref T value)`: coerce/veto before assignment) and `fieldChanged` (`void Method(T oldValue, T newValue)` after) — with the generated pipeline and the SG3015/SG3018 guardrails.
- `[SerializableProperty]` guidance narrowed to its remaining purpose: custom getters and setter semantics the hooks cannot express.
- `[AnchoredDateTime]` documented alongside `[DeltaDateTime]` (now marked legacy, with the version-bump warning for converting between them).

**Files:** `dev-docs/serialization.md`, `dev-docs/timers.md`, `dev-docs/claude-skills/modernuo-serialization.md`, `dev-docs/claude-skills/modernuo-timers.md`, `dev-docs/runuo-migration-docs/02-serialization.md`, `dev-docs/runuo-migration-docs/03-timers.md`, and a condensed v4 addition to CLAUDE.md rule 9.

**Example refresh:** the skill's `BagOfSending` "custom properties" example was itself converted in #2587 — it is now quoted in its real post-conversion form as the canonical hooks example; the real-examples list points at `BaseWeapon.cs` for custom getters and `BaseLight.cs` for the drifting-timer + `MigrateFrom` pattern.

Verified by grep: zero references to the removed v3 attribute names remain anywhere in `dev-docs/` or `CLAUDE.md`.
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Kamron Batman 2026-08-22 18:29:27 -07:00 • committed by GitHub
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dev-docs/timers.md
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@ -188,15 +188,19 @@ public partial class TimedItem : Item
```
### Pattern 4: Serializable Timer Field
Every serializable `Timer` member declares `[DeserializeTimer(nameof(Method))]` on the
field. By default the next tick is stored as anchored time (downtime does not consume the
remaining delay); pass `wallClock: true` for absolute deadlines. The method runs **only when
a timer was running at save**, with the remaining delay.
```csharp
[SerializableField(0, setter: "private")]
[DeserializeTimer(nameof(DeserializeDecayTimer))]
private Timer _decayTimer;
[DeserializeTimerField(0)]
private void DeserializeDecayTimer(TimeSpan delay)
{
_decayTimer = Timer.DelayCall(delay, Delete);
_decayTimer.Start();
}
public void BeginDecay(TimeSpan delay)