feat(pdf): add pdf extract command with pdftotext/pypdf fallback

Add `mytoolkit pdf extract` to extract text from PDFs. Tries pdftotext
(poppler) first for layout quality, falls back to pypdf.

bin/commands/pdf.py

@@ -1,6 +1,7 @@
 """PDF utilities."""
 
 import shutil
+import subprocess
 from pathlib import Path
 
 import click
@@ -165,6 +166,77 @@ def merge_pdfs(files, output, bookmark_depth, dry_run):
     click.echo(f"Merged {len(processed)} files into {output}")
 
 
+@pdf.command("extract")
+@click.argument("input_file", type=click.Path(exists=True, dir_okay=False, path_type=Path))
+@click.option(
+    "-o",
+    "--output",
+    type=click.Path(dir_okay=False, path_type=Path),
+    help="Output text file. Defaults to stdout.",
+)
+@click.option(
+    "-p",
+    "--pages",
+    help="Page range to extract (e.g. 1-5, 1,3,5). Defaults to all pages.",
+)
+@click.option(
+    "--layout/--no-layout",
+    default=False,
+    help="Preserve original layout using pdftotext -layout. Only applies when pdftotext is available.",
+)
+@handle_errors
+def extract_text(input_file, output, pages, layout):
+    """Extract text from a PDF file.
+
+    Tries pdftotext (poppler) first for best quality, falls back to pypdf.
+    """
+    text = ""
+    use_pdftotext = shutil.which("pdftotext") is not None
+
+    if use_pdftotext:
+        cmd = ["pdftotext"]
+        if layout:
+            cmd.append("-layout")
+        if pages:
+            cmd.extend(["-f", str(pages.split("-")[0]), "-l", str(pages.split("-")[-1])])
+        cmd.extend([str(input_file), "-"])
+        result = subprocess.run(cmd, capture_output=True, text=True)
+        text = result.stdout
+    else:
+        reader = PdfReader(str(input_file))
+        page_indices = _parse_page_range(pages, len(reader.pages))
+        text = "\n\n".join(
+            reader.pages[i].extract_text() or ""
+            for i in page_indices
+        )
+
+    if output:
+        output.write_text(text, encoding="utf-8")
+        click.echo(f"Extracted text to {output}")
+    else:
+        click.echo(text)
+
+
+def _parse_page_range(pages: str | None, total: int) -> list[int]:
+    """Parse a page range string into 0-based page indices."""
+    if not pages:
+        return list(range(total))
+
+    indices = set()
+    for part in pages.split(","):
+        part = part.strip()
+        if "-" in part:
+            start, end = part.split("-", 1)
+            start = int(start.strip()) - 1 if start.strip() else 0
+            end = int(end.strip()) if end.strip() else total
+            indices.update(range(max(0, start), min(total, end)))
+        else:
+            idx = int(part) - 1
+            if 0 <= idx < total:
+                indices.add(idx)
+    return sorted(indices)
+
+
 @pdf.command("bookmark")
 @click.argument("input_file", type=click.Path(exists=True, dir_okay=False, path_type=Path))
 @click.option(