chore(conductor): Add missing index.md and metadata.json to new tracks

conductor/tracks/tiered_context_scoping_hitl_approval/index.md

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+# Tiered Context Scoping & HITL Approval
+
+Introduces context subsetting per tier and Human-in-the-Loop spawn interceptor logic.
+
+### Navigation
+- [Specification](./spec.md)
+- [Implementation Plan](./plan.md)

conductor/tracks/tiered_context_scoping_hitl_approval/metadata.json

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+{
+  "id": "tiered_context_scoping_hitl_approval",
+  "title": "Tiered Context Scoping & HITL Approval",
+  "status": "planned",
+  "created_at": "2026-02-27T19:20:00.000000"
+}