Move adapter implementations into shared workspace packages

Extract claude-local and codex-local adapter code from cli/server/ui
into packages/adapters/ and packages/adapter-utils/. CLI, server, and
UI now import shared adapter logic instead of duplicating it. Removes
~1100 lines of duplicated code across packages. Register new packages
in pnpm workspace.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/adapters/claude-local/src/server/parse.ts

@@ -0,0 +1,132 @@
+import type { UsageSummary } from "@paperclip/adapter-utils";
+import { asString, asNumber, parseObject, parseJson } from "@paperclip/adapter-utils/server-utils";
+
+export function parseClaudeStreamJson(stdout: string) {
+  let sessionId: string | null = null;
+  let model = "";
+  let finalResult: Record<string, unknown> | null = null;
+  const assistantTexts: string[] = [];
+
+  for (const rawLine of stdout.split(/\r?\n/)) {
+    const line = rawLine.trim();
+    if (!line) continue;
+    const event = parseJson(line);
+    if (!event) continue;
+
+    const type = asString(event.type, "");
+    if (type === "system" && asString(event.subtype, "") === "init") {
+      sessionId = asString(event.session_id, sessionId ?? "") || sessionId;
+      model = asString(event.model, model);
+      continue;
+    }
+
+    if (type === "assistant") {
+      sessionId = asString(event.session_id, sessionId ?? "") || sessionId;
+      const message = parseObject(event.message);
+      const content = Array.isArray(message.content) ? message.content : [];
+      for (const entry of content) {
+        if (typeof entry !== "object" || entry === null || Array.isArray(entry)) continue;
+        const block = entry as Record<string, unknown>;
+        if (asString(block.type, "") === "text") {
+          const text = asString(block.text, "");
+          if (text) assistantTexts.push(text);
+        }
+      }
+      continue;
+    }
+
+    if (type === "result") {
+      finalResult = event;
+      sessionId = asString(event.session_id, sessionId ?? "") || sessionId;
+    }
+  }
+
+  if (!finalResult) {
+    return {
+      sessionId,
+      model,
+      costUsd: null as number | null,
+      usage: null as UsageSummary | null,
+      summary: assistantTexts.join("\n\n").trim(),
+      resultJson: null as Record<string, unknown> | null,
+    };
+  }
+
+  const usageObj = parseObject(finalResult.usage);
+  const usage: UsageSummary = {
+    inputTokens: asNumber(usageObj.input_tokens, 0),
+    cachedInputTokens: asNumber(usageObj.cache_read_input_tokens, 0),
+    outputTokens: asNumber(usageObj.output_tokens, 0),
+  };
+  const costRaw = finalResult.total_cost_usd;
+  const costUsd = typeof costRaw === "number" && Number.isFinite(costRaw) ? costRaw : null;
+  const summary = asString(finalResult.result, assistantTexts.join("\n\n")).trim();
+
+  return {
+    sessionId,
+    model,
+    costUsd,
+    usage,
+    summary,
+    resultJson: finalResult,
+  };
+}
+
+function extractClaudeErrorMessages(parsed: Record<string, unknown>): string[] {
+  const raw = Array.isArray(parsed.errors) ? parsed.errors : [];
+  const messages: string[] = [];
+
+  for (const entry of raw) {
+    if (typeof entry === "string") {
+      const msg = entry.trim();
+      if (msg) messages.push(msg);
+      continue;
+    }
+
+    if (typeof entry !== "object" || entry === null || Array.isArray(entry)) {
+      continue;
+    }
+
+    const obj = entry as Record<string, unknown>;
+    const msg = asString(obj.message, "") || asString(obj.error, "") || asString(obj.code, "");
+    if (msg) {
+      messages.push(msg);
+      continue;
+    }
+
+    try {
+      messages.push(JSON.stringify(obj));
+    } catch {
+      // skip non-serializable entry
+    }
+  }
+
+  return messages;
+}
+
+export function describeClaudeFailure(parsed: Record<string, unknown>): string | null {
+  const subtype = asString(parsed.subtype, "");
+  const resultText = asString(parsed.result, "").trim();
+  const errors = extractClaudeErrorMessages(parsed);
+
+  let detail = resultText;
+  if (!detail && errors.length > 0) {
+    detail = errors[0] ?? "";
+  }
+
+  const parts = ["Claude run failed"];
+  if (subtype) parts.push(`subtype=${subtype}`);
+  if (detail) parts.push(detail);
+  return parts.length > 1 ? parts.join(": ") : null;
+}
+
+export function isClaudeUnknownSessionError(parsed: Record<string, unknown>): boolean {
+  const resultText = asString(parsed.result, "").trim();
+  const allMessages = [resultText, ...extractClaudeErrorMessages(parsed)]
+    .map((msg) => msg.trim())
+    .filter(Boolean);
+
+  return allMessages.some((msg) =>
+    /no conversation found with session id|unknown session|session .* not found/i.test(msg),
+  );
+}