consolidate/compile-check hangs: pdflatex nonstopmode deadlocks on high-error TeX files

[kiki830621]

Bug

macdoc pdf compile-check and macdoc pdf consolidate hang indefinitely when the input .tex file contains many errors.

Root Cause

TexCompileChecker invokes pdflatex -interaction=nonstopmode. On files with 100+ errors:

1. pdflatex hits the hardcoded 100-error limit and emits (That makes 100 errors; please try again.) → Fatal error occurred, no output PDF file produced!
2. However, in nonstopmode, certain error types (group mismatch, missing }) cause pdflatex to not terminate cleanly — it hangs at 0% CPU waiting for something.
3. macdoc's process is waiting for pdflatex's stdout/stderr to close → deadlock.

Observed Behavior

• pdflatex -interaction=nonstopmode hangs (CPU 0%, indefinitely)
• pdflatex -interaction=batchmode completes (exits with error code 1, produces log)
• pdflatex -interaction=scrollmode also completes

Reproduction

# 741-page Wooldridge textbook, AI-transcribed with ~300+ LaTeX errors
macdoc pdf init --pdf wooldridge.pdf --output wooldridge-latex
macdoc pdf segment --project wooldridge-latex
macdoc pdf render --project wooldridge-latex
macdoc pdf blocks --project wooldridge-latex
macdoc pdf transcribe-pages --project wooldridge-latex --backend codex
macdoc pdf chapters --project wooldridge-latex
macdoc pdf assemble --project wooldridge-latex --skip-compile

# These hang:
macdoc pdf compile-check --project wooldridge-latex   # hangs
macdoc pdf consolidate --project wooldridge-latex --agent claude  # hangs at compile step

Suggested Fix

1. Use batchmode instead of nonstopmode in TexCompileChecker — batchmode always terminates
2. Add a timeout (e.g., 120s) to the pdflatex subprocess — kill it if it doesn't exit
3. Pipe stdin from /dev/null to prevent pdflatex from waiting for user input on certain errors

All three would independently fix the deadlock. Combining (1) + (2) would be most robust.

Environment

• macdoc v0.4.0
• pdfTeX 3.141592653-2.6-1.40.27 (TeX Live 2025)
• macOS 15.3 (Darwin 25.3.0)