docs(site): the engagement system — cutover 7 of 7 (edge → main)
#28
@@ -4,12 +4,13 @@ description: One number, declared in three repositories, that decides whether a
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---
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import { Aside } from '@astrojs/starlight/components';
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import platform from '../../../../data/platform.json';
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The loopback wire protocol between the game plugin and the sidecar is a **versioned
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compatibility contract**, not a build dependency. Nothing compiles the three sides together,
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so the number is what stops a mismatch from being discovered as corrupted data.
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The current protocol is **4**.
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The current protocol is **{platform.protocol}**.
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## Three declaration sites
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@@ -17,8 +18,8 @@ The same number is written down in three places, and they must move together.
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| Where | What declares it |
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|---|---|
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| `link/sidecar/src/main.rs` | `pub const PROTOCOL_VERSION: u32 = 4` — what the sidecar speaks |
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| `servuo-plugins/overlay.toml` | `protocol = 4` — what the plugin overlay speaks |
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| `link/sidecar/src/main.rs` | `PROTOCOL_VERSION`, currently {platform.protocol} — what the sidecar speaks |
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| `servuo-plugins/overlay.toml` | `protocol`, currently {platform.protocol} — what the plugin overlay speaks |
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| The bundle manifest | Copied from `overlay.toml` by CI, so a released pair carries its own claim |
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<Aside type="caution" title="Bump the overlay in the same PR as the emitters">
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@@ -44,19 +45,19 @@ allowed to be chosen independently.
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## What a bump obliges
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Changing a message shape means editing every side plus the specification. A protocol-4
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change touched:
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Changing a message shape means editing every side plus the specification. The most recent
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bump touched:
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| Repository | What had to change |
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|---|---|
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| `servuo-plugins` | The emitters, the config keys, and `overlay.toml` |
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| `link` | `PROTOCOL_VERSION`, a store migration, and the projections |
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| `link` | `PROTOCOL_VERSION`, and the projections |
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| `module-uo` | The tables, the ingest, and the kind-to-feature map |
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| `docs` | The protocol document and the integration guide |
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Note `link`'s entry: **a protocol bump can require a store migration**, because the sidecar
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persists what it forwards. That is not automatic, and version 4 was the first bump that
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needed one.
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**A protocol bump can also require a store migration**, because the sidecar persists what it
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forwards. That is not automatic — version 4 needed one and version 5 did not, because
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version 5 only widened frames the store already keeps whole.
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## This is not the module API version
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@@ -92,8 +93,10 @@ What is worth inheriting is the **shape**:
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## Canonical documents
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[`link/v5.md`](https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/v5.md)
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is the current protocol's record, including its cross-repository obligations, and
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[`link/v4.md`](https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/v4.md)
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is the protocol-4 record, including its cross-repository obligations;
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the one before it;
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[`link/PLAN.md`](https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/PLAN.md)
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§7 is the wire protocol, and
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[`link/INTEGRATION.md`](https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/INTEGRATION.md)
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@@ -14,9 +14,9 @@
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"verifiedOn": "2026-08-19",
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"protocol": 4,
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"protocol": 5,
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"moduleApi": "1.6.0",
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"moduleApi": "1.9.0",
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"bundle": {
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"tag": "2026.08.19",
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