feat(providers): add pure claude adapter with record-stream golden tests (5b-1)

claude.parse mirrors indexJsonl line-for-line but yields IndexRecords (no db).
Adds MessageTurnDurationRecord op. Purely additive — buildIndex still uses the
old path. 111/111 green.

scripts/indexer.mjs

@@ -808,4 +808,4 @@ function buildIndex({ force = false } = {}) {
   db.close();
 }
 
-export { buildIndex, indexJsonl, inferProjectPath, refreshSessionProjectPaths, shouldSkipBuild };
+export { buildIndex, indexJsonl, discoverJsonlFiles, inferProjectPath, refreshSessionProjectPaths, shouldSkipBuild };

scripts/providers/claude.ts

@@ -0,0 +1,131 @@
+// Claude Code provider adapter (see docs/adr/0001).
+//
+// Pure: discovers Claude transcript files and parses one into a record stream.
+// It never touches the Obelisk database. The per-line logic mirrors the original
+// indexJsonl exactly, but yields IndexRecords instead of writing rows; the shared
+// persist layer consumes them. Session aggregates here reflect only THIS chunk
+// (started_at/ended_at/message_count); persist merges them with any existing row.
+
+import { createRequire } from 'node:module';
+const require = createRequire(import.meta.url);
+const fs = require('node:fs');
+
+import {
+  extractText, extractContentType, extractMessageIsMeta,
+  filePath, trunc, truncJson, readLines,
+} from '../db.mjs';
+import { discoverJsonlFiles } from '../indexer.mjs';
+
+import type { Cursor, DiscoverContext, IndexRecord, IndexUnit, Provider } from './types.ts';
+
+// Claude cursor encodes the file mtime and the number of lines already indexed:
+// "<mtimeMs>:<linesProcessed>". mtime lets discovery detect change; lines lets
+// parse resume without reprocessing.
+function cursorToSkip(cursor: Cursor): number {
+  if (!cursor) return 0;
+  const n = Number(cursor.split(':')[1]);
+  return Number.isFinite(n) ? n : 0;
+}
+
+export const name = 'claude';
+
+export function discover(_ctx: DiscoverContext): IndexUnit[] {
+  return discoverJsonlFiles().map((f: any) => ({
+    key: f.path,
+    sessionId: f.sessionId,
+    project: f.project,
+    isSubagent: f.isSubagent,
+    agentId: f.agentId,
+    meta: f.workflowRunId ? { workflowRunId: f.workflowRunId } : undefined,
+  }));
+}
+
+export function* parse(unit: IndexUnit, cursor: Cursor): Generator<IndexRecord, Cursor> {
+  const skip = cursorToSkip(cursor);
+  const mtime = fs.statSync(unit.key).mtimeMs;
+  const isSubagent = unit.isSubagent === true;
+  const records: IndexRecord[] = [];
+  const sm = {
+    started_at: null as string | null,
+    ended_at: null as string | null,
+    git_branch: null as string | null,
+    version: null as string | null,
+    title: null as string | null,
+    n: 0,
+  };
+
+  let lineNum = 0;
+  readLines(unit.key, (line: string) => {
+    lineNum++;
+    if (lineNum <= skip) return;
+    let obj: any;
+    try { obj = JSON.parse(line); } catch { return; }
+    const sid = unit.sessionId;
+    const ts = obj.timestamp || null;
+
+    if (obj.type === 'ai-title' && obj.aiTitle) { sm.title = obj.aiTitle; return; }
+    if (obj.type === 'system' && obj.subtype === 'away_summary' && obj.content) {
+      records.push({ kind: 'summary', id: obj.uuid || `${sid}-away-${ts}`, session_id: sid, timestamp: ts, source: 'away_summary', content: obj.content });
+      return;
+    }
+    if (obj.type === 'system' && obj.subtype === 'turn_duration' && obj.parentUuid && obj.durationMs) {
+      records.push({ kind: 'message-turn-duration', uuid: obj.parentUuid, turn_duration_ms: obj.durationMs });
+      return;
+    }
+    if (obj.type !== 'user' && obj.type !== 'assistant') return;
+
+    if (ts && (!sm.started_at || ts < sm.started_at)) sm.started_at = ts;
+    if (ts && (!sm.ended_at || ts > sm.ended_at)) sm.ended_at = ts;
+    if (obj.gitBranch) sm.git_branch = obj.gitBranch;
+    if (obj.version) sm.version = obj.version;
+    sm.n++;
+
+    const msg = obj.message || {};
+    const text = extractText(msg.content);
+    const contentType = extractContentType(msg.content);
+    const isMeta = extractMessageIsMeta(obj, text);
+    const usage = msg.usage || {};
+    const aid = isSubagent ? (unit.agentId ?? null) : (obj.agentId || null);
+
+    if (obj.uuid) {
+      records.push({
+        kind: 'message', uuid: obj.uuid, session_id: sid, type: obj.type,
+        parent_uuid: obj.parentUuid || null, timestamp: ts, role: msg.role || obj.type,
+        text, content_type: contentType, is_meta: (isMeta ? 1 : 0), model: msg.model || null,
+        is_sidechain: obj.isSidechain ? 1 : 0, agent_id: aid,
+        input_tokens: usage.input_tokens || null, output_tokens: usage.output_tokens || null,
+        cwd: obj.cwd || null, skill: obj.attributionSkill || null, source: 'claude',
+      });
+    }
+
+    if (obj.type === 'assistant' && Array.isArray(msg.content)) {
+      for (const b of msg.content) {
+        if (b.type === 'tool_use' && b.id)
+          records.push({ kind: 'tool_call', id: b.id, message_uuid: obj.uuid, session_id: sid, name: b.name, input_json: truncJson(b.input || {}) as string, file_path: filePath(b.name, b.input) });
+      }
+    }
+
+    if (obj.type === 'user' && Array.isArray(msg.content)) {
+      for (const b of msg.content) {
+        if (b.type !== 'tool_result' || !b.tool_use_id) continue;
+        const rt = typeof b.content === 'string' ? b.content
+          : Array.isArray(b.content) ? b.content.map((c: any) => c.text || '').join('\n') : '';
+        records.push({ kind: 'tool_result', tool_use_id: b.tool_use_id, message_uuid: obj.uuid, session_id: sid, content: trunc(rt), file_path: obj.toolUseResult?.filePath || null, is_error: b.is_error ? 1 : 0 });
+      }
+    }
+  });
+
+  // Subagent transcripts do not own a session row (matches indexJsonl).
+  if (!isSubagent) {
+    records.push({
+      kind: 'session', id: unit.sessionId, title: sm.title, project: unit.project || null,
+      started_at: sm.started_at, ended_at: sm.ended_at, git_branch: sm.git_branch,
+      version: sm.version, message_count: sm.n, jsonl_path: unit.key, source: 'claude',
+    });
+  }
+
+  yield* records;
+  return `${mtime}:${lineNum}`;
+}
+
+export const claudeProvider: Provider = { name, discover, parse };

scripts/providers/types.ts

@@ -60,6 +60,7 @@ export type IndexRecord =
   | SubagentRecord
   | WorkflowRecord
   | WorkflowAgentRecord
+  | MessageTurnDurationRecord
   | DeleteSessionRecord;
 
 export interface MessageRecord {
@@ -163,6 +164,15 @@ export interface WorkflowAgentRecord {
   tool_calls?: number | null;
 }
 
+// Update op (not a table): sets messages.turn_duration_ms for a message that was
+// (or will be) inserted by a separate line, possibly on a different run. Persist
+// applies it as a targeted UPDATE, so it never clobbers other message columns.
+export interface MessageTurnDurationRecord {
+  kind: 'message-turn-duration';
+  uuid: string;
+  turn_duration_ms: number;
+}
+
 // Retraction op (not a table). The adapter emits this when a previously-indexed
 // session must be removed — e.g. a Codex guardian/auto-review thread. Persist
 // executes the cascade delete across all tables for that session.