v2.2-paseo-providers: Paseo provider stack + v2.2.1 pane-scoped chat fixes

Ship Paseo-equivalent provider snapshot, AgentComposerBar, ACP dispatch
rewrite with streaming/persist, permission prompts, and agent commands.
Follow-up: pane-scoped chat resolution, CoderMessageList tool timeline,
WS user-delta replace, and inference orphan tool_call stripping.
Archive openspec v2-2; update CHANGELOG and CURRENT.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/lib/apply-user-delta.ts

@@ -0,0 +1,11 @@
+/** User messages are inserted atomically — never stream-append like assistant deltas. */
+export function applyMessageDelta(
+  role: 'user' | 'assistant' | 'system' | 'tool',
+  existingContent: string,
+  chunk: string,
+): string {
+  if (role === 'user') {
+    return chunk || existingContent;
+  }
+  return existingContent + chunk;
+}

apps/web/src/lib/coder-session.ts

@@ -0,0 +1,18 @@
+/** Sessions created for BooCoder work (sidebar / project list icons). */
+export function isCoderSessionName(name: string | null | undefined): boolean {
+  if (!name) return false;
+  if (name === 'New BooCode') return true;
+  if (name.startsWith('Task [')) return true;
+  if (name.startsWith('Coder:')) return true;
+  return false;
+}
+
+/** Optimistic coder pane shell before scoped chat id arrives from the server. */
+export function defaultCoderWorkspacePane(id: string = crypto.randomUUID()) {
+  return {
+    id,
+    kind: 'coder' as const,
+    chatIds: [] as string[],
+    activeChatIdx: -1,
+  };
+}

apps/web/src/lib/coder-tools.ts

@@ -0,0 +1,68 @@
+import type { ToolCall, ToolResult } from '@/api/types';
+import type { ToolRun } from '@/components/ToolCallLine';
+
+export interface AcpWireMeta {
+  status?: 'running' | 'completed' | 'failed' | 'canceled';
+  kind?: string | null;
+  title?: string;
+  output?: unknown;
+  error?: string;
+}
+
+export interface CoderToolCallWire {
+  id: string;
+  function: { name: string; arguments: string };
+}
+
+function parseArgs(raw: string): Record<string, unknown> {
+  try {
+    const parsed = JSON.parse(raw) as Record<string, unknown>;
+    return parsed && typeof parsed === 'object' ? parsed : {};
+  } catch {
+    return {};
+  }
+}
+
+export function wireToolCallToRun(wire: CoderToolCallWire): ToolRun {
+  const args = parseArgs(wire.function.arguments);
+  const acp = args._acp as AcpWireMeta | undefined;
+  const { _acp: _ignored, ...rest } = args;
+  const lifecycle = acp?.status ?? 'running';
+  const call: ToolCall = {
+    id: wire.id,
+    name: wire.function.name,
+    args: rest,
+  };
+  if (lifecycle === 'running') {
+    return { call, result: null };
+  }
+  const result: ToolResult = {
+    tool_call_id: wire.id,
+    output: acp?.output ?? null,
+    truncated: false,
+    ...(acp?.error ? { error: acp.error } : {}),
+  };
+  return { call, result };
+}
+
+export function mergeWireToolCall(
+  existing: CoderToolCallWire[] | undefined,
+  incoming: { id: string; name: string; args: Record<string, unknown> },
+): CoderToolCallWire[] {
+  const entry: CoderToolCallWire = {
+    id: incoming.id,
+    function: { name: incoming.name, arguments: JSON.stringify(incoming.args) },
+  };
+  const list = existing ?? [];
+  const idx = list.findIndex((tc) => tc.id === incoming.id);
+  if (idx >= 0) {
+    const next = [...list];
+    next[idx] = entry;
+    return next;
+  }
+  return [...list, entry];
+}
+
+export function wireToolCallsToRuns(wires: CoderToolCallWire[] | undefined): ToolRun[] {
+  return (wires ?? []).map(wireToolCallToRun);
+}

apps/web/src/lib/slash-command.ts

@@ -0,0 +1,29 @@
+export interface SlashCommandItem {
+  name: string;
+  description?: string;
+}
+
+/** True while the user is still typing the command name after `/`. */
+export function isSlashCommandToken(value: string): boolean {
+  return /^\/[^\s]*$/.test(value);
+}
+
+export function slashQuery(value: string): string {
+  return value.slice(1);
+}
+
+export function parseSlashInput(text: string): { cmdName: string; args: string } | null {
+  const match = text.match(/^\/(\S+)\s*([\s\S]*)$/);
+  if (!match) return null;
+  return { cmdName: match[1]!, args: (match[2] ?? '').trim() };
+}
+
+export function mergeCommandsByName(...lists: SlashCommandItem[][]): SlashCommandItem[] {
+  const byName = new Map<string, SlashCommandItem>();
+  for (const list of lists) {
+    for (const cmd of list) {
+      byName.set(cmd.name, cmd);
+    }
+  }
+  return [...byName.values()].sort((a, b) => a.name.localeCompare(b.name));
+}