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lunar-modrinth-chain-poc/poc/renderer-chain-skeleton.md

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+# Renderer Chain Skeleton
+
+This is a non-executable outline. It intentionally omits a working payload.
+
+## Preconditions To Validate In A Private Lab
+
+- A private Modrinth project or controlled API fixture can return raw HTML in
+  project `body` or version `changelog`.
+- Lunar Explore renders that content in the packaged launcher.
+- The injected frame can access the exposed `window.lunar` or
+  `window.electron` preload bridge from the rendered context.
+- The main Redux bridge accepts a forged `profiles/addOrUpdateProfile` action.
+- `installModpack` accepts the forged profile ID.
+- Override extraction writes root `overrides/*` files to the controlled
+  effective game directory.
+- `openExternalLink` reaches `shell.openExternal` for a local launcher file URL
+  with a non-restricted initiator.
+
+## Non-Executable Flow
+
+1. Build a virtual profile object with these properties:
+   - `id`: fresh local ID
+   - `type`: `modrinth`
+   - `provider`: `modrinth`
+   - `state`: `virtual`
+   - `useLunarFeatures`: compatible with target Modrinth version
+   - `modrinth.projectId`: controlled test project
+   - `modrinth.selectedVersion.versionId`: controlled test version
+   - `overrides.gameDirectory`: writable test directory
+2. Send a profile-add action into the main Redux state-sync channel.
+3. Invoke the Lunar Modrinth install API for that profile ID.
+4. Confirm the controlled test `.mrpack` root override is written under the
+   chosen game directory.
+5. Invoke the Lunar external-link API with a local `file:` URL to the benign
+   launcher file.
+6. Confirm the calculator pop or marker file.
+
+## Expected Benign Result
+
+The validation succeeds only if a benign calculator pop or marker file is
+observed. Do not test with an arbitrary command or payload outside a controlled
+lab.