docs: scaffold polisher-control foundation

shared/schemas/examples/manifest.example.json

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+{
+  "schema_version": "manifest.v1",
+  "manifest_id": "manifest-job-2026-07-001",
+  "bundle_type": "job",
+  "source_id": "job-2026-07-001",
+  "created_at": "2026-07-15T09:31:00Z",
+  "created_by": "polisher-sim/0.6.0",
+  "entries": [
+    {
+      "filename": "job.json",
+      "role": "primary",
+      "hash_sha256": "a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2",
+      "size_bytes": 2007,
+      "content_type": "application/json",
+      "description": "Frozen planning job package."
+    },
+    {
+      "filename": "predicted_removal.csv",
+      "role": "attachment",
+      "hash_sha256": "b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3",
+      "size_bytes": 524288,
+      "content_type": "text/csv",
+      "description": "Predicted removal map, 256x256 grid, nm."
+    },
+    {
+      "filename": "pre_surface.csv",
+      "role": "attachment",
+      "hash_sha256": "c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4",
+      "size_bytes": 524288,
+      "content_type": "text/csv",
+      "description": "Pre-polish surface map used as planning input."
+    },
+    {
+      "filename": "manifest.json",
+      "role": "manifest",
+      "hash_sha256": "0000000000000000000000000000000000000000000000000000000000000000",
+      "size_bytes": 0,
+      "content_type": "application/json",
+      "description": "This manifest (self-reference, hash zeroed by convention)."
+    }
+  ],
+  "notes": "July proving scenario — single-pass astigmatism correction job bundle."
+}