[codex] Add GPT-5.4 experiment config and generated deliverables

[NUM-GITHUB]

Summary

• Adds a GPT-5.4 Codex experiment config at exp_config/codex.yaml.
• Adds named prompts under exp_config/prompts/ so each experiment can be run without overwriting prompt.txt.
• Adds generated deliverables for all currently requested tasks under deliverable/.
• Keeps raw README-style log packages local under packaged_results/; the table below records every LOG_DIR and zip filename. The raw zips are intentionally not committed because full LOG_DIR archives include local Codex metadata/auth files.

Committed deliverables

• deliverable/bayesian_inference_beamer.tex
• deliverable/sorting-visualization.svg
• deliverable/fourier_transform_explained.svg
• deliverable/texforge/
• deliverable/gitvault/
• deliverable/noteflow/
• deliverable/stayflow_agents/

Run log index

All runs used exp_config/codex.yaml with model: gpt-5.4 and reasoning.effort: high.

Task	Prompt	LOG_DIR	Local package	Result	Duration	Verification
Bayesian Inference Beamer PPT	exp_config/prompts/bayesian_inference_beamer.txt	.massgen/massgen_logs/log_20260504_201538_844223	packaged_results/bayesian_inference_beamer_log_20260504_201538_844223.zip	completed, winner agent_a	828.651s	Tectonic PDF build artifact produced
Sorting Visualization	exp_config/prompts/sorting_visualization.txt	.massgen/massgen_logs/log_20260504_204748_621274	packaged_results/sorting_visualization_log_20260504_204748_621274.zip	completed, winner agent_a	653.466s	SVG structure/animation verification
Collaborative LaTeX Platform	exp_config/prompts/collaborative_latex_platform.txt	.massgen/massgen_logs/log_20260504_214032_388509	packaged_results/collaborative_latex_platform_log_20260504_214032_388509.zip	completed, winner agent_a	2418.020s	pytest 9 passed; boot smoke passed
GitHub Platform	exp_config/prompts/github_platform.txt	.massgen/massgen_logs/log_20260504_214120_783838	packaged_results/github_platform_log_20260504_214120_783838.zip	completed, winner agent_a	2506.612s	pytest 8 passed; live smoke passed
Fourier Transform Visualization	exp_config/prompts/fourier_transform_visualization.txt	.massgen/massgen_logs/log_20260504_215739_762724	packaged_results/fourier_transform_visualization_log_20260504_215739_762724.zip	completed, winner agent_a	748.225s	SVG XML parse passed
Notion Platform	exp_config/prompts/notion_platform.txt	.massgen/massgen_logs/log_20260504_221022_885123	packaged_results/notion_platform_log_20260504_221022_885123.zip	completed, winner agent_a	3145.225s	node --test 6 passed; runtime smoke passed
Rental Platform with AI Agents	exp_config/prompts/rental_platform_ai_agents.txt	.massgen/massgen_logs/log_20260504_222203_763547	packaged_results/rental_platform_ai_agents_log_20260504_222203_763547.zip	completed, winner agent_a	1095.914s	node --test 4 passed

Local validation after copying into this PR

• git diff --check
• SVG XML parse for deliverable/sorting-visualization.svg and deliverable/fourier_transform_explained.svg
• PYTHONPATH=. UV_CACHE_DIR=/tmp/massgen-texforge-uv-cache uv run pytest tests/test_texforge.py -q -p no:cacheprovider in deliverable/texforge -> 9 passed
• UV_CACHE_DIR=/tmp/massgen-gitvault-uv-cache uv run pytest -q -p no:cacheprovider in deliverable/gitvault -> 8 passed
• node --check server.mjs && node --check public/app.js && node --test tests/*.test.mjs in deliverable/noteflow -> 6 passed
• node --check deliverable/app.mjs && node --check deliverable/state-engine.mjs && node --test tests/prototype.test.mjs tests/ui-smoke.test.mjs in deliverable/stayflow_agents -> 4 passed
• staged secret/file scan checked no .codex/, .git/, auth.json, .venv, cache, .db, or .sqlite files in committed deliverables

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