feat: IMAP mail sync with thread-to-contact matching (PRD §6.1)

Real IMAP connection via imapflow library:
- Connects to IMAP server (IMAPFlow, TLS on port 993)
- Fetches recent messages (configurable limit, default 20)
- Extracts: from, fromEmail, subject, date, snippet (200 chars)
- Thread-to-contact matching (PRD §6.1):
  1. Match sender email against persons table
  2. If no person match, extract domain and match against company.website
  3. Returns matchedCompany + matchedPerson for each email
- Audit-logged (action: crm.mailsync:imap)
- Zod validated (host, port, user, password, folder, limit)
- 502 on IMAP connection failure with detail
- 400 on validation failure

Tested: invalid creds → 502 'IMAP connection failed', missing host → 400

skills/pptx/scripts/extract_html_style.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+"""Extract every <style>...</style> block from a reference HTML and write the
+concatenated CSS to <output_dir>/global.css.
+
+Usage:
+    python extract_html_style.py <html_path> <output_dir> [--name FILE]
+
+The output file name defaults to global.css so it slots straight into the
+ppt skill's `<work_dir>/slides/global.css` convention. Pass --name to override.
+"""
+from __future__ import annotations
+
+import argparse
+import re
+import sys
+from pathlib import Path
+
+STYLE_RE = re.compile(r"<style\b[^>]*>(.*?)</style>", re.DOTALL | re.IGNORECASE)
+
+
+def extract_style_blocks(html_text: str) -> list[str]:
+    return [m.group(1) for m in STYLE_RE.finditer(html_text)]
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser(description=__doc__.split("\n", 1)[0])
+    ap.add_argument("html_path", type=Path, help="path to source HTML file")
+    ap.add_argument("output_dir", type=Path, help="directory to write the CSS into")
+    ap.add_argument("--name", default="global.css",
+                    help="output CSS file name (default: global.css)")
+    args = ap.parse_args()
+
+    if not args.html_path.is_file():
+        print(f"error: {args.html_path} is not a file", file=sys.stderr)
+        return 2
+
+    text = args.html_path.read_text(encoding="utf-8", errors="replace")
+    blocks = extract_style_blocks(text)
+    if not blocks:
+        print(f"error: no <style> blocks found in {args.html_path}", file=sys.stderr)
+        return 1
+
+    args.output_dir.mkdir(parents=True, exist_ok=True)
+    css = "\n\n".join(b.strip() for b in blocks)
+    out = args.output_dir / args.name
+    out.write_text(css, encoding="utf-8")
+    print(f"wrote {out} ({len(css)} bytes from {len(blocks)} <style> block(s))")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())