phase-1: scaffold platform foundation structure and architecture governance

docs/architecture/foundation/adr/ADR-009-feature-flags-and-capability-guards.md

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+# ADR-009: Feature Flags and Capability Guards
+
+Status: Accepted
+Date: 2026-07-03
+
+## Context
+
+Platform tenants have optional capabilities. Features cannot be assumed always present.
+
+## Decision
+
+Introduce capability model backed by bootstrap feature flags:
+
+- FeatureFlagService exposes tenant capabilities.
+- Routes, widgets, and actions are guarded by capability checks.
+- Missing capability must degrade gracefully with fallback behavior.
+
+## Consequences
+
+Positive:
+
+- One runtime supports variable tenant feature sets.
+- Reduces tenant branching and dead code.
+
+Negative:
+
+- Requires explicit defaults and fallback UX.
+
+## Compliance Requirements
+
+- Components and pages cannot assume optional feature availability.
+- Capability checks must be centralized, not scattered conditionals.