🌐 [translation-sync] Add a lecture on Social Security trust fund depletion

[mmcky]

Automated Translation Sync

This PR contains automated translations from QuantEcon/lecture-python.myst.

Source PR

#1091 - Add a lecture on Social Security trust fund depletion

Files Updated

• ✏️ lectures/_toc.yml

⚠️ Files Failed to Translate

The following new file(s) could not be translated and are absent from this PR. Their entries have been removed from lectures/_toc.yml so the target build stays green; the entries return with the files once they are delivered. The error details and recovery steps are in the failure issue this run opens on the source repository.

• ❌ lectures/social_security_depletion.md

Details

• Source Language: en
• Target Language: zh-cn
• Model: claude-sonnet-5

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This PR was created automatically by the translation action.

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[Copilot]

🟡 Changes recommended

The added _toc.yml entries reference four lecture files that do not exist in the repository, which will break the jb build lectures -W CI build.

1 open finding

• ToC references missing lecture source files · New

What changed in this PR

This is an automated translation-sync PR from QuantEcon/lecture-python.myst (source PR #1091). Its stated purpose is to add the "Social Security trust fund depletion" lecture to the Chinese translation book. However, the lecture itself (social_security_depletion.md) failed to translate and is absent, so the only file actually changed is lectures/_toc.yml.

The diff does not match the stated intent: instead of handling social_security_depletion, it adds table-of-contents entries for four unrelated lectures (gallant_tauchen, lucas_prescott_investment, optimal_growth_uncertainty, lq_mean_field_games) whose .md files do not exist in this repository. Since CI builds with jb build lectures -n -W, these ToC references to missing documents will break the build.

Changes:

• Adds four - file: ToC entries referencing lecture files that are not present in lectures/ (build-breaking).
• Introduces an incidental trailing-whitespace change on the 统计与信息论 caption line (harmless).
• Does not add or reference social_security_depletion, contrary to the PR description.

File	Description
lectures/​_toc.yml	Adds ToC entries for four lectures whose source files are missing from the repo, which will fail the Jupyter Book build; does not touch the social_security_depletion lecture named in the PR.

🧠 Review effort: Balanced

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