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+# a2ui-rs — Screen Addressing over ClassView — PROPOSAL (council pending)
+
+> **Status:** PROPOSAL — spec detailed enough that a council VERIFIES rather
+> than redesigns; deviations require a numbered factual error, not taste.
+>
+> **Ask (operator, 2026-07-14):** *"prepare for some sort of Citrix via same
+> desktop addressing via classview and widefieldmask, via askama/jinja and
+> using nested classview for address and ERB pattern fieldview classview for
+> rendering from memory without serialization … Argon2 etc for the rdp-2graph
+> … not pushing pixels but instead addressing the screen … using
+> AdaWorldAPI/A2UI and transcode it to AdaWorldAPI/a2ui-rs as an ogar target
+> for desktop addressing/rendering via classview using the a2ui pattern but
+> reimagined with our optimizations."*
+>
+> **One sentence:** the remote desktop stops pushing pixels and starts
+> **addressing the screen** — down the wire go `(GUID key 16 B, WideFieldMask
+> delta, changed LE values)`, up the wire go `ActionInvocation`s; the client
+> holds the ClassView/template codebook and renders locally from borrowed
+> memory (askama, zero serialization) — **the ClassView registry is the font
+> of the desktop**: you don't stream glyph rasters, you reference codepoints.
+
+## C0. The convergence this closes
+
+A screen and a document are the SAME positional projection — the doc-layer
+amendment A3 already ruled it for documents (template = ClassView ×
+WideFieldMask; Kopfzeile/main/Fußzeile = positions in the ordered set, same
+brick as the Klickwege menu-quad). A live desktop is that projection with a
+heartbeat. The `DocRenderer` adapter family gains its fourth member:
+
+| adapter | output |
+|---|---|
+| tesseract PDF | raster + text layer |
+| Spire.Doc | Word |
+| askama | data-only PDF/HTML |
+| **a2ui (this proposal)** | **live interactive surface** |
+
+One template projection; re-issue a document as PDF or serve it as a living
+screen — same mechanism, different renderer.
+
+## C1. Nested ClassView = the screen address (numbered claims)
+
+1. **Hierarchy:** desktop → window → region → widget is nested ClassView
+   projection — a widget is a field position in its parent's ordered set,
+   exactly as a doc-IR `Region` carries `children`. The `X:Y` u8:u8 rail on
+   the 256×256 tile is the layout address (the same rail documents and
+   Klickwege surfaces use). No new addressing scheme.
+2. **Wire-truth (the Firewall, ADR-022/023):** the hot path carries LE bytes
+   — `key(16 B) + mask delta + changed values` — never JSON, never protobuf.
+   Protobuf/JSON exist only at a browser membrane if a non-wasm client needs
+   them. The render reads the SoA row **in place**: askama borrows the
+   struct; nothing serializes in order to draw. That is the operator's "ERB
+   pattern fieldview ClassView rendering from memory without serialization."
+3. **The thin-client question, answered:** the client must hold the
+   ClassView/template codebook (amortized once, D-AMORT — like a font). With
+   templates resident, the *same Rust* (ClassView resolve + askama render)
+   compiles to **wasm** — so the browser IS the thin client; a bespoke native
+   client is a later option, not a prerequisite. Hardware acceleration =
+   wasm + canvas/webgpu on the client's own silicon — which is exactly what
+   "don't push pixels" buys: the server never rasterizes at all.
+4. **RBAC by projection (the security headline):** what leaves the server is
+   `WideFieldMask ∩ role-mask` (`FieldMask::intersect`, the existing RBAC
+   brick from the SoC/dedup pipeline). A field the role may not see is not
+   *hidden on the client* — it is **absent from the wire**. Pixel streams
+   cannot make that guarantee; address streams get it for free.
+5. **rdp-2graph security = reuse, no new crypto:** session KDF via
+   `ogar-auth` (Argon2 — the MedCare Tier-1 password/totp home), transport
+   via `ogar-encryption` (the single generic encryption surface). The
+   session is a capability over classid ranges + role mask.
+6. **Events upstream are live Klickwege:** a click IS a `navigates_to` /
+   `ActionInvocation` edge — the SAME closed vocabulary the C# harvest
+   emits statically becomes the runtime event stream. Interaction telemetry
+   lands as graph edges with zero new vocabulary.
+
+## C2. The A2UI transcode — what carries over, what is replaced
+
+The `AdaWorldAPI/A2UI` fork (cloned + verified 2026-07-14): the upstream
+pattern is *"agents speak UI"* — declarative intent, client renders natively;
+`renderers/{react,angular,flutter,lit,web_core,markdown}` are the client
+precedents; `blueprints/`, `agent_sdks/`, `eval/` the ecosystem.
+
+**Prior art IN the fork, regraded:** `proto/a2ui/hamming.proto` (commit
+`28ed91b`, "gRPC bitpacked Hamming protocol … thin client transport") is an
+earlier substrate-flavored pass — 1,250-byte fingerprint frames, XOR deltas,
+BindSpace/ladybug-compatible. That is the **pre-V3 carrier era** (the
+singleton-BindSpace/fingerprint-as-carrier model the V3 rulings retired).
+**Regrade, don't delete:** the SERVICE SHAPE survives — `RenderStream`
+(server→client surface), `ActionStream` (client→server actions),
+`SyncCodebook`/`PushCodebookDelta` (template/codebook amortization),
+session init with codebook version — while the PAYLOAD is replaced by the
+V3 facet: 16 B key + WideFieldMask delta + LE values instead of 1,250 B
+fingerprint frames. (~78× smaller per addressed node, and the key
+prerenders layout with zero value decode — the P0 canon doing the work.)
+
+| A2UI pattern (kept) | reimagined payload (V3) |
+|---|---|
+| declarative component tree | nested ClassView projection (classid-addressed) |
+| stream whole tree / JSON patches | WideFieldMask deltas + changed LE values |
+| inline actions/callbacks | `ActionDef` refs, invoked as `ActionInvocation` (C3 trap) |
+| per-framework renderers | ONE wasm fieldview client (askama) + membrane adapters |
+| codebook sync (hamming.proto) | ClassView/template registry sync (same RPC shape) |
+
+## C3. Traps (named before they bite)
+
+- **T1 — component-vocabulary fork:** A2UI's Card/List/TextField vocabulary
+  must NOT become a second closed vocabulary beside the doc-IR RegionKinds.
+  Widget *skins* are ClassView/template side (render, lo-u16 world);
+  structural kinds stay ONE closed vocabulary. A "new widget" is a template,
+  never an enum variant.
+- **T2 — behavior in the tree (the SURREAL-AST trap, UI edition):** A2UI
+  callbacks/handlers must never ride inline in the surface. Behavior is
+  `ActionDef` on the Core node; the surface carries only the *address* of an
+  action. `DEFINE EVENT` in DDL and `onClick: <lambda>` in a component tree
+  are the same hijack.
+- **T3 — a serialization layer creeping back:** the moment the "protocol"
+  grows a JSON/proto struct in the server→wasm hot path, the Firewall is
+  breached. LE bytes end-to-end; wasm ingests them zero-copy.
+
+## C4. The killer probe — re-host a MedCare screen (the transpile endgame)
+
+Everything needed already exists in the harvest: 106 screens with
+screen→concept bindings (Klickwege golden v2), 162 `CompiledClass` + 2,748
+`ActionDef`s (the corpus), ClassView + `ogar-render-askama`.
+**P-REHOST:** pick ONE harvested MedCare form; project its `CompiledClass`
+through ClassView × WideFieldMask into an askama template; serve it as an
+addressed surface; fire one of its harvested `ActionDef`s round-trip.
+GREEN = the legacy app's screen, re-rendered from the graph, **no WinForms**
+— harvest the app → re-render the app. That is what "Citrix via desktop
+addressing" concretely means, and it is the transpile substrate's endgame
+demo.
+
+## C5. Waves
+
+- **W0 — repo + regrade (operator gates):** mint `AdaWorldAPI/a2ui-rs`;
+  regrade `hamming.proto` in the A2UI fork (keep shape, mark payload
+  pre-V3). Council verifies THIS spec.
+- **W1 — surface contract (canon-free, in OGAR):** the addressed-surface
+  types — nested ClassView address, WideFieldMask delta frame, ActionInvocation
+  ref — serde-only, mirroring `ogar-doc-ir` discipline (closed vocab, load
+  gate, version marker).
+- **W2 — a2ui-rs transcode:** the service shape (RenderStream/ActionStream/
+  codebook sync) reimplemented over the W1 frames; membrane adapters
+  (JSON/proto) only at the edge.
+- **W3 — wasm fieldview client:** ClassView resolve + askama render compiled
+  to wasm; LE ingest zero-copy; canvas/webgpu paint.
+- **W4 — P-REHOST** (C4) — the gate before any scale-out.
+- **W5 — rdp-2graph session:** ogar-auth Argon2 KDF + ogar-encryption
+  transport + role-mask projection (C1.4) + upstream Klickwege events.
+
+## C6. Non-goals (v1)
+
+- No pixel-codec fallback (that's what we're replacing).
+- No new template DSL (askama IS the fieldview; jinja parity later if a
+  non-Rust server ever needs it).
+- No new crypto (ogar-auth/ogar-encryption only).
+- No canon mints — widget skins are templates, not concepts; if a genuine
+  UI *concept* ever needs a classid, it goes through the codebook like any
+  other mint, council-gated.
+- No gRPC/protobuf in the hot path (membrane only).
+
+## C7. DISCOVERY-MAP entry (mandatory)
+
+Append `D-A2UI-SCREEN-ADDRESSING`: screens are addressed, not rasterized —
+nested ClassView × WideFieldMask down, ActionInvocation up, client holds the
+template codebook (the font of the desktop), RBAC by mask-intersection
+projection, hamming.proto regraded pre-V3 (shape kept, payload replaced).
+Grade `[S]` until the council + P-REHOST promote it.
diff --git a/docs/DISCOVERY-MAP.md b/docs/DISCOVERY-MAP.md
index 18889ed..b537853 100644
--- a/docs/DISCOVERY-MAP.md
+++ b/docs/DISCOVERY-MAP.md
@@ -1368,3 +1368,32 @@ isolation. The map's job is to keep them visible.
   create the PR from the browser link.** W2 (tesseract) still needs repo
   access; P-XRETINA now needs only the tesseract producer (the DOM half is
   live + the `converges_on_facts` probe is on OGAR main via #199).
+
+- **D-A2UI-SCREEN-ADDRESSING** (2026-07-14; [S] — proposal, council + repo
+  mint gate W0+): the remote desktop stops pushing pixels and starts
+  **addressing the screen** — down the wire `(GUID key 16 B, WideFieldMask
+  delta, changed LE values)`, up the wire `ActionInvocation`s; the client
+  holds the ClassView/template codebook and renders locally from borrowed
+  memory (askama, zero serialization; wasm client = the same Rust — the
+  browser IS the thin client). **The ClassView registry is the font of the
+  desktop** (codepoints, not glyph rasters; D-AMORT). A screen and a document
+  are the SAME positional projection (doc-layer A3 extended): `DocRenderer`
+  gains its fourth adapter — a2ui, the live interactive surface. Nested
+  ClassView = desktop→window→region→widget; `X:Y` rails = layout address.
+  **RBAC by projection:** what leaves the server = `WideFieldMask ∩
+  role-mask` — an unauthorized field is absent from the wire, not hidden.
+  Security = reuse (`ogar-auth` Argon2 KDF, `ogar-encryption` transport).
+  Home: `AdaWorldAPI/A2UI` fork (cloned/verified — upstream "agents speak
+  UI" pattern; its `proto/a2ui/hamming.proto` prior art REGRADED pre-V3:
+  service shape kept — RenderStream/ActionStream/codebook sync — payload
+  replaced, 1,250 B fingerprint frames → 16 B key + mask + values) →
+  transcode target `AdaWorldAPI/a2ui-rs` (repo NOT yet minted — operator
+  gate). Traps named: T1 component-vocab fork (skins are templates, never a
+  second closed vocabulary), T2 behavior-in-tree (the SURREAL-AST trap, UI
+  edition — actions are `ActionDef` refs), T3 serialization creep (LE
+  end-to-end, Firewall). Killer probe **P-REHOST**: re-render one harvested
+  MedCare screen from CompiledClass × ClassView × askama, fire one harvested
+  ActionDef round-trip — harvest the app → re-render the app, no WinForms.
+  Charter: `docs/A2UI-SCREEN-ADDRESSING-PROPOSAL.md`. Depends:
+  D-DOC-IR-SECOND-RETINA (A3 template ruling), D-OGAR-DOC-LAYER
+  (DocRenderer), the Klickwege/ActionDef harvests (MedCare-rs).