Add GSoC 2026 fuzzing demo v1

[kimaiden1984-boop]

Summary

This PR adds a GSoC 2026 demo v1 workspace for SMT-assisted and format-aware fuzzing of OpenPrinting parser/filter pipelines.

The goal of this first version is to provide a runnable local research scaffold: setup helpers, weak public seeds, parser/filter target configs, coverage-oriented input generation, crash deduplication, replay helpers, and ASan/AFL++ workflow hooks.

What Is Included

• smt-fuzzer/: standalone Python fuzzing and triage scaffold.
• Interactive setup entry point: scripts/setup_tui.sh.
• Quick local campaign runner for installed CUPS filters.
• Isolated ASan build-plan helper for libcupsfilters, libppd, and cups-filters.
• AFL++ command/environment helpers.
• Format-aware generators for PPD, raster, image, PDF, text, command, and PostScript-style inputs.
• Crash deduplication and replay/GDB helper scripts.
• Unit tests and config validation.

Quick Start

cd "contributions/GSoC 2026 - Advanced System-Level Fuzzing for OpenPrinting - Deep State Exploration and LLM-Augmented Mutation/smt-fuzzer"
scripts/setup_tui.sh

For a non-interactive smoke test:

scripts/install_ubuntu_deps.sh --minimal -y
python3 -m venv .venv
. .venv/bin/activate
python3 -m pip install -U pip
python3 -m pip install -e .
scripts/run_smoke.sh
python3 -m unittest discover -s tests

Recommended quick target check when system CUPS filters are installed:

scripts/run_local_cups_filters_campaign.sh /usr/lib/cups/filter 1 2 5 configs/parser_targets.yaml

Notes For Reviewers

This is a research/demo scaffold, not a production fuzzing deployment yet. It is intended to make local reproduction, target expansion, and future ASan/AFL++ integration easier to collaborate on.

Generated campaign outputs stay under work/ and are ignored by git. The submitted seeds are weak public seeds only; issue-specific reproducer material is not included in the PR.

New found issue by this system : OpenPrinting/libcupsfilters#148