chore: import upstream snapshot with attribution

tests/parser-subagent-collection.test.ts

@@ -0,0 +1,61 @@
+import { mkdtemp, mkdir, rm, writeFile } from 'fs/promises'
+import { tmpdir } from 'os'
+import { join, basename } from 'path'
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+
+import { collectJsonlFiles, readAgentType } from '../src/parser.js'
+
+let root: string
+beforeEach(async () => { root = await mkdtemp(join(tmpdir(), 'codeburn-collect-')) })
+afterEach(async () => { await rm(root, { recursive: true, force: true }) })
+
+describe('collectJsonlFiles', () => {
+  // Regression for #470: workflow/ultracode subagent transcripts live nested at
+  // `<session>/subagents/workflows/<wf>/agent-*.jsonl`. A flat scan dropped them,
+  // so usage went uncounted whenever the workflow feature was on.
+  it('collects nested workflow subagent transcripts, not just top-level subagent files', async () => {
+    const sessionDir = join(root, 'session-1')
+    const wfDir = join(sessionDir, 'subagents', 'workflows', 'wf_abc')
+    await mkdir(wfDir, { recursive: true })
+
+    await writeFile(join(root, 'session-1.jsonl'), '{}\n')
+    await writeFile(join(sessionDir, 'subagents', 'agent-direct.jsonl'), '{}\n')
+    await writeFile(join(wfDir, 'agent-nested.jsonl'), '{}\n')
+    // Sidecar metadata must never be picked up as a transcript.
+    await writeFile(join(wfDir, 'agent-nested.meta.json'), '{}\n')
+
+    const found = (await collectJsonlFiles(root)).map(f => basename(f)).sort()
+
+    expect(found).toContain('session-1.jsonl')
+    expect(found).toContain('agent-direct.jsonl')
+    expect(found).toContain('agent-nested.jsonl')
+    expect(found).not.toContain('agent-nested.meta.json')
+  })
+
+  it('returns an empty list for a missing directory without throwing', async () => {
+    await expect(collectJsonlFiles(join(root, 'does-not-exist'))).resolves.toEqual([])
+  })
+})
+
+describe('readAgentType (Claude-scoped agent-type detection)', () => {
+  it('reads agentType from a subagent transcript’s sibling .meta.json', async () => {
+    const dir = join(root, 'session', 'subagents')
+    await mkdir(dir, { recursive: true })
+    await writeFile(join(dir, 'agent-x.jsonl'), '{}\n')
+    await writeFile(join(dir, 'agent-x.meta.json'), JSON.stringify({ agentType: 'Explore' }))
+    expect(await readAgentType(join(dir, 'agent-x.jsonl'))).toBe('Explore')
+  })
+
+  it('falls back to workflow-subagent for nested workflow agents without a meta', async () => {
+    const dir = join(root, 'session', 'subagents', 'workflows', 'wf_1')
+    await mkdir(dir, { recursive: true })
+    await writeFile(join(dir, 'agent-y.jsonl'), '{}\n')
+    expect(await readAgentType(join(dir, 'agent-y.jsonl'))).toBe('workflow-subagent')
+  })
+
+  it('returns undefined for an ordinary (non-subagent) session file', async () => {
+    await writeFile(join(root, 'session.jsonl'), '{}\n')
+    expect(await readAgentType(join(root, 'session.jsonl'))).toBeUndefined()
+  })
+})