docs: add training roadmap

docs/TRAINING_ROADMAP.md

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+# TRAINING ROADMAP
+
+Scope: AFS Scawful training data pipelines and monitoring. Research-only.
+
+## Committed (exists now)
+- Dataset registry indexing (local)
+- Resource indexing (local)
+- Plugin config loader for training paths/resources
+
+## Planned (near-term)
+- Validator base + initial validators (ASM/C++/KG/ASAR)
+- Generator base + one small generator
+- Training monitor schema validation and config docs
+
+## Planned (mid-term)
+- Generator runner that produces dataset manifests
+- QA summary reports (counts, sizes, validation results)
+- Repeatable dataset build scripts (local-only)
+
+## Ideas (later)
+- Training campaign runner (batching + resume)
+- Per-generator metrics export (JSON)
+- Optional remote sync hooks (explicit opt-in, no auto-network)
+
+## Unknown / needs verification
+- Which generators can be safely generalized outside local workflows
+- Which validation checks are still useful vs legacy noise