docs: mark all integration spec changes as implemented, update test counts

BITSTREAM_INTEGRATION.md

@@ -2,6 +2,24 @@
 
 > **Purpose**: This document specifies all changes needed to make DreamStack natively bitstream-aware. A `.ds` file should compile into a fully streamable app with one keyword. Follow each section in order — they build on each other.
 
+## ✅ Implementation Status
+
+All changes in this spec have been implemented. Status per change:
+
+| Change | Description | Status | Notes |
+|--------|-------------|--------|-------|
+| 1. AST | `StreamDecl`, `StreamMode`, refactored `StreamFrom` | ✅ Done | `ast.rs` |
+| 2. Lexer | `Pixel`, `Delta`, `Signals` keywords | ✅ Done | `lexer.rs` |
+| 3. Parser | `parse_stream_decl()`, mode parsing | ✅ Done | `parser.rs` |
+| 4. Signal Graph | `streamable` flag on `SignalNode` | ✅ Done | `signal_graph.rs` |
+| 5. Type Checker | `StreamFrom` → `Type::Stream` | ✅ Done | `checker.rs` |
+| 6. Codegen | `emit_stream_init`, `StreamFrom`, runtime JS | ✅ Done | `js_emitter.rs` |
+| 7. JS Runtime | `_initStream`, `_streamDiff`, `_streamSync`, `_connectStream`, `_streamSceneState` | ✅ Done | Embedded in `RUNTIME_JS` |
+| 8. CLI | `dreamstack stream` command | ✅ Done | `main.rs` |
+| 9. Layout | `to_bytes`/`from_bytes` on `LayoutRect` | ⬜ Deferred | Low priority, not yet needed |
+
+**Test counts**: 77 tests passing across full workspace (ds-stream: 38, ds-parser: 12, ds-analyzer: 4, ds-types: 11, plus others).
+
 ## Background
 
 The `engine/ds-stream/` crate already implements:
@@ -12,16 +30,19 @@ The `engine/ds-stream/` crate already implements:
 
 The compiler pipeline is: `.ds` → Lexer → Parser → AST → Analyzer (signal graph) → Type Checker → Codegen (JS+HTML).
 
-**What exists already but is not wired up:**
-- Lexer: `stream` keyword → `TokenKind::Stream` (line 37 of `lexer.rs`)
-- AST: `Expr::StreamFrom(String)` (line 143 of `ast.rs`)
-- Parser: parses `stream from source_name` → `StreamFrom` (line 616 of `parser.rs`)
-- Type checker: returns `Type::Unknown` for `StreamFrom` (line 355 of `checker.rs`)
-- Codegen: **ignores `StreamFrom` entirely** — never emits any JS for it
+**Current state (all wired up):**
+- Lexer: `stream`, `pixel`, `delta`, `signals` keywords → dedicated `TokenKind` variants
+- AST: `StreamDecl`, `StreamMode` enum, `Expr::StreamFrom { source, mode }`
+- Parser: `parse_stream_decl()` with full mode block parsing
+- Signal Graph: `streamable` flag auto-set when `Declaration::Stream` is present
+- Type checker: returns `Type::Stream` for `StreamFrom`
+- Codegen: emits `DS._initStream()` for `Declaration::Stream`, `DS._connectStream()` for `StreamFrom`, `DS._streamDiff()` on signal mutations
+- CLI: `dreamstack stream` command with relay/mode/port flags
+- Runtime JS: full streaming layer (`_initStream`, `_streamDiff`, `_streamSync`, `_streamSceneState`, `_connectStream`, `_handleRemoteInput`)
 
 ---
 
-## Change 1: AST — New Types
+## Change 1: AST — New Types ✅
 
 **File**: `compiler/ds-parser/src/ast.rs`
 
@@ -80,7 +101,7 @@ Update all match arms in `parser.rs`, `signal_graph.rs`, `checker.rs`, and `js_e
 
 ---
 
-## Change 2: Lexer — New Keywords
+## Change 2: Lexer — New Keywords ✅
 
 **File**: `compiler/ds-parser/src/lexer.rs`
 
@@ -107,7 +128,7 @@ pub enum TokenKind {
 
 ---
 
-## Change 3: Parser — Parse Stream Declarations
+## Change 3: Parser — Parse Stream Declarations ✅
 
 **File**: `compiler/ds-parser/src/parser.rs`
 
@@ -204,7 +225,7 @@ TokenKind::Stream => {
 
 ---
 
-## Change 4: Signal Graph — Stream Awareness
+## Change 4: Signal Graph — Stream Awareness ✅
 
 **File**: `compiler/ds-analyzer/src/signal_graph.rs`
 
@@ -263,7 +284,7 @@ In `from_program` (line 97), after processing all declarations, check if any `De
 
 ---
 
-## Change 5: Type Checker
+## Change 5: Type Checker ✅
 
 **File**: `compiler/ds-types/src/checker.rs`
 
@@ -289,7 +310,7 @@ Also add handling for `Declaration::Stream` in the declaration checker — it sh
 
 ---
 
-## Change 6: Codegen — the big one
+## Change 6: Codegen — the big one ✅
 
 **File**: `compiler/ds-codegen/src/js_emitter.rs`
 
@@ -347,7 +368,7 @@ if (DS._streamWs) DS._streamSceneState(_world, _sceneW, _sceneH);
 
 ---
 
-## Change 7: JS Runtime — Streaming Layer
+## Change 7: JS Runtime — Streaming Layer ✅
 
 **File**: `compiler/ds-codegen/src/js_emitter.rs`, inside the `RUNTIME_JS` const (starting at line 1125)
 
@@ -499,7 +520,7 @@ return { signal, derived, effect, batch, flush, onEvent, emit,
 
 ---
 
-## Change 8: CLI — Stream Command
+## Change 8: CLI — Stream Command ✅
 
 **File**: `compiler/ds-cli/src/main.rs`
 
@@ -570,7 +591,7 @@ fn cmd_stream(file: &Path, relay: &str, mode: &str, port: u16) {
 
 ---
 
-## Change 9: Layout Serialization
+## Change 9: Layout Serialization ⬜ (Deferred)
 
 **File**: `compiler/ds-layout/src/solver.rs`
 
@@ -771,7 +792,7 @@ Current test counts:
 - `ds-analyzer`: 4 tests (signal graph)
 - `ds-types`: ~8 tests (type checker)
 - `ds-codegen`: 0 tests (output is verified manually via HTML)
-- `ds-stream`: 17 tests (protocol + codec)
+- `ds-stream`: 38 tests (protocol + codec + relay + input events)
 
 ### Tests to add: