Initial SFERA platform baseline

docs/codex_tasks/SPRINT_1_SIR.md

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+# SPRINT 1 — SIR Core
+
+## Цель
+
+Создать `packages/sir`.
+
+## Files
+
+- `enums.py`
+- `source_ref.py`
+- `lineage.py`
+- `nodes.py`
+- `edges.py`
+- `diagnostics.py`
+- `references.py`
+- `snapshot.py`
+- `delta.py`
+- `validation.py`
+- `serialization.py`
+- `hashing.py`
+
+## DoD
+
+```bash
+pytest packages/sir/tests
+```
+
+Должно проходить:
+
+- snapshot validation ok;
+- dangling edge detected;
+- serialization roundtrip;
+- snapshot hash deterministic;
+- diagnostics/unresolved references serializable.