refactor(f8): controllers depend on SidecarRouter + isAuthorable (key via keyOf)

Spec §6.4: constructor store CoauthorStore→SidecarRouter, rootDir→string|undefined;
isInRoot/isTracked gate → isAuthorable(scheme); per-doc key via store.keyOf(docIdentity).
Seam + artifact logic unchanged. currentAuthor omits git email when no root (fail-open).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/attributionController.ts

@@ -10,14 +10,14 @@
  */
 import * as fs from "node:fs";
 import * as vscode from "vscode";
-import { CoauthorStore } from "./store";
+import { SidecarRouter, docIdentity } from "./sidecarRouter";
 import { newId, type AttributionRecord, type Provenance } from "./model";
 import { buildFingerprint, resolve, type OffsetRange } from "./anchorer";
 import { gitUserEmail } from "./identity";
 import { applyChange, coalesce, type LiveSpan } from "./attributionTracker";
 import { minimizeReplace, PendingEditRegistry } from "./pendingEdits";
 import type { VersionGuard } from "./versionGuard";
-import { isUnderRoot } from "./workspacePath";
+import { isAuthorable } from "./workspacePath";
 
 /** Test-facing snapshot of live attribution state for a document. */
 export interface RenderedSpan {
@@ -74,8 +74,8 @@ export class AttributionController implements vscode.Disposable {
   readonly onDidApplyAgentEdit: vscode.Event<{ document: vscode.TextDocument }> = this.applyEmitter.event;
 
   constructor(
-    private readonly store: CoauthorStore,
-    private readonly rootDir: string,
+    private readonly store: SidecarRouter,
+    private readonly rootDir: string | undefined,
     private readonly guard: VersionGuard,
   ) {
     this.disposables.push(this.agentType, this.humanType, this.statusItem, this.output, this.applyEmitter);
@@ -88,14 +88,15 @@ export class AttributionController implements vscode.Disposable {
   }
 
   private isTracked(document: vscode.TextDocument): boolean {
-    return document.uri.scheme === "file" && isUnderRoot(document.uri.fsPath, this.rootDir);
+    return isAuthorable(document.uri.scheme);
   }
-  private docPathOf(uri: vscode.Uri): string {
-    return vscode.workspace.asRelativePath(uri, false);
+  /** The single document key (F8): repo-relative path in-workspace, URI string otherwise. */
+  private keyOf(document: vscode.TextDocument): string {
+    return this.store.keyOf(docIdentity(document));
   }
   private currentAuthor(): Provenance {
     const id = vscode.workspace.getConfiguration("git").get<string>("user.name") || process.env.USER || "human";
-    const email = gitUserEmail(this.rootDir);
+    const email = this.rootDir !== undefined ? gitUserEmail(this.rootDir) : undefined;
     return { kind: "human", id, ...(email !== undefined ? { email } : {}) };
   }
   private state(docPath: string): DocAttribution {
@@ -112,7 +113,7 @@ export class AttributionController implements vscode.Disposable {
   /** Load the sidecar and re-resolve every attribution (live span | orphan). */
   loadAll(document: vscode.TextDocument): void {
     if (!this.isTracked(document)) return;
-    const docPath = this.docPathOf(document.uri);
+    const docPath = this.keyOf(document);
     const s = this.state(docPath);
     const artifact = this.store.load(docPath);
     s.spans = [];
@@ -143,7 +144,7 @@ export class AttributionController implements vscode.Disposable {
   handleExternalSidecarChange(uri: vscode.Uri): void {
     for (const s of this.docs.values()) {
       if (this.store.sidecarPath(s.docPath) === uri.fsPath) {
-        const doc = vscode.workspace.textDocuments.find((d) => this.docPathOf(d.uri) === s.docPath);
+        const doc = vscode.workspace.textDocuments.find((d) => this.keyOf(d) === s.docPath);
         if (doc) this.loadAll(doc);
       }
     }
@@ -153,7 +154,7 @@ export class AttributionController implements vscode.Disposable {
 
   private onDidChange(e: vscode.TextDocumentChangeEvent): void {
     if (!this.isTracked(e.document) || e.contentChanges.length === 0) return;
-    const docPath = this.docPathOf(e.document.uri);
+    const docPath = this.keyOf(e.document);
     if (!e.document.isDirty && this.matchesDisk(e.document)) {
       // Disk sync (revert / external reload): buffer now equals the file on
       // disk — re-resolve, never attribute (PUC-4). A real edit can also
@@ -248,7 +249,7 @@ export class AttributionController implements vscode.Disposable {
   ): Promise<boolean> {
     if (!this.isTracked(document)) return false;
     if (opts?.expectedVersion !== undefined && document.version !== opts.expectedVersion) return false;
-    const docPath = this.docPathOf(document.uri);
+    const docPath = this.keyOf(document);
     const startOffset = document.offsetAt(range.start);
     const endOffset = document.offsetAt(range.end);
     const oldText = document.getText(range);
@@ -298,8 +299,8 @@ export class AttributionController implements vscode.Disposable {
 
   private onDidSave(document: vscode.TextDocument): void {
     if (!this.isTracked(document)) return;
-    if (this.guard.isReadOnly(this.docPathOf(document.uri))) return;
-    const docPath = this.docPathOf(document.uri);
+    if (this.guard.isReadOnly(this.keyOf(document))) return;
+    const docPath = this.keyOf(document);
     const s = this.docs.get(docPath);
     // Allow save when hadAttributions is true even if spans/orphans are now empty:
     // that means the user deliberately deleted all attributed text, and we must
@@ -351,7 +352,7 @@ export class AttributionController implements vscode.Disposable {
 
   private render(document: vscode.TextDocument): void {
     if (!this.isTracked(document)) return;
-    const s = this.docs.get(this.docPathOf(document.uri));
+    const s = this.docs.get(this.keyOf(document));
     const spans = this.visible && s ? s.spans : [];
     const toRange = (sp: LiveSpan) =>
       new vscode.Range(document.positionAt(sp.start), document.positionAt(sp.end));