build: commit the oac build manifest

The manifest is the ledger orphan removal reasons from, so it has to travel
with the repo. A fresh CI clone with no manifest prunes nothing, which means
a deleted source would leave stale generated output while git diff stayed
clean — the exact hole the drift gate exists to close.

It also records what "generated" means: 41 files, and eval-runner.md is not
among them. That absence is what makes it safe, rather than a rule about it
that could be got wrong.

.oac/build-manifest.json

@@ -0,0 +1,210 @@
+{
+  "version": 1,
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+      "target": "opencode",
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+      "target": "opencode",
+      "root": ".opencode/agent"
+    },
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+      "target": "opencode",
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+      "target": "opencode",
+      "root": ".opencode/agent"
+    },
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+      "target": "claude-code",
+      "root": ".tmp/oac-build/plugins/claude-code/agents"
+    },
+    ".tmp/oac-build/plugins/claude-code/agents/context-manager.md": {
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+      "target": "claude-code",
+      "root": ".tmp/oac-build/plugins/claude-code/agents"
+    },
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+      "target": "claude-code",
+      "root": ".tmp/oac-build/plugins/claude-code/agents"
+    },
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+      "root": ".tmp/oac-build/plugins/claude-code/agents"
+    },
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+      "root": ".tmp/oac-build/plugins/claude-code/agents"
+    },
+    ".tmp/oac-build/plugins/claude-code/agents/task-manager.md": {
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+      "target": "claude-code",
+      "root": ".tmp/oac-build/plugins/claude-code/agents"
+    },
+    ".tmp/oac-build/plugins/claude-code/agents/tester.md": {
+      "sha256": "838e023fbbb06f75d37778751f76e37831af2f99586e63ac1bb3410ed3155990",
+      "target": "claude-code",
+      "root": ".tmp/oac-build/plugins/claude-code/agents"
+    },
+    "registry.json": {
+      "sha256": "0c5b7641e7d4cdfb76e65e1da266de1980fa935309cf71c17cc3b349689b8cbd",
+      "target": "registry",
+      "root": "registry.json"
+    }
+  }
+}