Build the inbound-library core: store, IMAP intake, registries, notices.

ILIB-WP-0002-T01..T06: append-only item store, read-only IMAP intake with
quarantine, file-backed registries, idempotent hub/pull/digest notices,
run-due with health and the systemd user timer. 14 tests pass. Registers
the intelligence topics and the intelligence-radar subscription.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 1170398@bnt-lap001
Assistant-Session: 622cd705-cb31-4322-ba08-dd42e44fa583

tools/demo.py

@@ -0,0 +1,38 @@
+"""Run intake, matching, notices and digests on synthetic mail in a temp root."""
+import json
+import sys
+import tempfile
+from email.message import EmailMessage
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+from inbound_library import intake, notify  # noqa: E402
+from inbound_library.__main__ import run_due  # noqa: E402
+
+with tempfile.TemporaryDirectory() as tmp:
+    root = Path(tmp)
+    (root / 'registry' / 'sources').mkdir(parents=True)
+    (root / 'registry' / 'subscriptions').mkdir()
+    (root / 'registry' / 'topics.json').write_text(json.dumps(
+        {'version': 1, 'topics': {'demo.brief': 'Synthetic brief'}}))
+    (root / 'registry' / 'sources' / 'demo-sender.json').write_text(json.dumps({
+        'id': 'demo-sender', 'owner_repo': 'demo', 'channel': 'email',
+        'match': {'from': 'brief@demo.test'}, 'topics': ['demo.brief'],
+        'cadence': 'daily', 'visibility': 'shared'}))
+    (root / 'registry' / 'subscriptions' / 'demo.json').write_text(json.dumps({
+        'repo': 'demo', 'agent': 'demo', 'topics': ['demo.brief'],
+        'channels': ['hub', 'pull', 'digest'], 'cadence': 'daily'}))
+    mail = root / 'mail'
+    mail.mkdir()
+    for n, sender in enumerate(['brief@demo.test', 'stranger@demo.test'], 1):
+        message = EmailMessage()
+        message['From'], message['Subject'] = sender, f'Synthetic message {n}'
+        message['Message-ID'] = f'<demo-{n}@demo.test>'
+        message.set_content(f'Synthetic body {n}.')
+        (mail / f'{n}.eml').write_bytes(message.as_bytes())
+    sent = []
+    report = run_due(root, {}, mailbox=intake.DirectoryMailbox(mail),
+                     post=lambda base, payload: sent.append(payload))
+    print(json.dumps(report, indent=2))
+    print('\nHub message (not sent):\n' + sent[0]['body'])
+    print('\nHealth:\n' + json.dumps(notify.health(root), indent=2))