feat: establish Quant OS production-80 architecture

runtimes/README.md

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+# Proprietary runtime boundaries
+
+These directories document deployment boundaries. They do not vendor platform
+SDKs or credentials.
+
+- `portable36`: generated dependency-free consumer for hosted Python 3.6.
+- `joinquant`: JoinQuant upload/runtime contract.
+- `qmt_builtin`: QMT built-in strategy runtime.
+- `colab`: notebook runtime and data-upload boundary.
+
+Current executable compatibility files remain under `platforms/`, `dist/` and
+`notebooks/` until their golden-vector migrations complete.

runtimes/colab/README.md

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+# Colab runtime
+
+The canonical notebook remains `notebooks/quant_os_colab.ipynb`. Colab may
+receive only data whose licence permits the use and which contains no broker
+credential, account, holding, fill or other sensitive account fact.

runtimes/joinquant/README.md

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+# JoinQuant runtime
+
+The hosted file is a thin execution consumer. Current source and generated
+artifacts remain at `platforms/joinquant_strategy.py` and
+`dist/joinquant_strategy.py` during compatibility migration.

runtimes/portable36/README.md

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+# portable36
+
+Target boundary for the generated Python 3.6-compatible TargetPackage consumer.
+It may consume versioned schemas and golden vectors, but cannot import the
+modern local core or calculate Alpha.

runtimes/qmt_builtin/README.md

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+# QMT built-in runtime
+
+The built-in runtime remains backtest-only until real QMT contract, callback,
+restart, reconciliation and broker programmatic-trading evidence pass.