docs: holistic vision (Platform pillar)

docs/holistic-vision.md

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+# The Holistic Realization Model — DCM's place in it
+
+_Foundational. Captured 2026-06-08. Master copy: `dav/docs/holistic-vision.md`
+(mirrored in `udlm/docs/holistic-vision.md`). This file states the shared model and
+where **DCM** sits in it._
+
+## The model
+
+**Use Cases are the unit of desired outcome.** A Use Case is *realized* only when
+**three foundational pillars** each support it:
+
+- **Platform** — can the architecture/plan support the UC? Managed through
+  capabilities, specification, rules, context, execution. *(answers: can the system
+  do it?)*
+- **People / Process** — is the organization, its people, skills, and processes
+  structured and operating to support the UC? *(operating model, org design, value
+  streams)*
+- **Enablement** — is the consumer enabled to adopt, consume, and operate the UC?
+  *(adoption, change, skills transfer, operationalization)*
+
+> **Platform + People/Process + Enablement → realization of Use Cases → the holistic vision.**
+
+Each pillar is a different **view of mostly the same data** (UCs ↔ gaps ↔
+capabilities), evaluated by the same gap-analysis engine (DAV); only the **evaluation
+target** and **ingestion method** change per pillar. Output is always: gaps →
+prioritized capabilities → strategy + roadmap.
+
+## DCM's role: the Platform pillar realization
+
+DCM is a reference realization of the **Platform** pillar — the declarative control
+plane (Data / Provider / Policy) that makes a platform *able to support* Use Cases. In
+the holistic model, DCM answers **"can the system do it?"** — one of three pillars, not
+the whole picture. People/Process and Enablement sit alongside it, evaluated against the
+same UCs.
+
+This framing keeps DCM's scope honest: DCM enables the platform foundation; realizing a
+Use Case end-to-end still requires the organization (People/Process) and the consumer's
+ability to adopt it (Enablement). DAV is the engine that evaluates all three; DCM is what
+"good" looks like for the platform pillar, and the spec DAV validates against in AD mode.