Delete committed dataset orphans (Track X)

[mmcky]

Deletes lectures/old_stuff.txt, a scratch file at the lectures root that nothing references.

Published surface: none — continuous-time-mcs.quantecon.org/old_stuff.txt is 404 today (intro.html 200 control), so the deletion is complete on merge and there is nothing for the settle policy to clear.

Deletion-time reader sweep (2026-09-01). Authenticated tarball-and-grep pass over 407 repositories: all 283 QuantEcon org repos (70 private, 26 archived; numfocus, quantecon-book-dp and test-cli are empty and unfetchable) plus 130 forks of the six holding repos (2 returned 404 and are recorded as not-swept rather than clean). Matched by basename, not URL, with each hit's three preceding lines folded in because URLs get split across source lines. Controls fired in the same pass: a never-existing basename returned 0 hits and 0 copies, and both known readers were found — the English python_advanced_features.md exercise link to test_table.csv, and devopseng99/project.lecture-wasm's runtime fetch of intro's graph.txt. Result: no repository reads any path this PR deletes. Every other co-occurrence of these basenames is a %%file embed, prose, a .gitignore line, or review text; the pre-MyST master/source/… reads in old course repos have been dead since the MyST migration and are unaffected.

Part of the Track X orphan sweep, QuantEcon/workspace-lectures#57 (one PR per holding repo, identical titles). Source list: https://quantecon.github.io/data-lectures/audit.json orphans, 2026-08-31 run.

🤖 Generated with Claude Code

[netlify]

✅ Deploy Preview for sparkly-moxie-de1f0e ready!

Name	Link
🔨 Latest commit	2123a81
🔍 Latest deploy log	https://app.netlify.com/projects/sparkly-moxie-de1f0e/deploys/6a96174e1f8f380008131bac
😎 Deploy Preview	https://deploy-preview-234--sparkly-moxie-de1f0e.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for adorable-cucurucho-69162b ready!

Name	Link
🔨 Latest commit	2123a81
🔍 Latest deploy log	https://app.netlify.com/projects/adorable-cucurucho-69162b/deploys/6a96174eeaf05c00089c0a8e
😎 Deploy Preview	https://deploy-preview-234--adorable-cucurucho-69162b.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[Copilot]

Pull request overview

Removes an unreferenced scratch lecture artifact (lectures/old_stuff.txt) as part of the Track X dataset-orphan sweep, reducing repository clutter without affecting any published surface.

Changes:

• Deleted lectures/old_stuff.txt (a MyST/Jupytext-style scratch document) from the lectures/ directory.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[github-actions]

🚀 Deployed on https://6a961889dc2a2cfbd132563d--adorable-cucurucho-69162b.netlify.app

[mmcky]

Validation (2026-09-01, preview 6a961889…--adorable-cucurucho): old_stuff.txt → 404; intro.html → 200 (28,293 B). Build log: 0 warnings mentioning the deleted file. Nothing in this repo reads it, so there is no data-lectures reference to check.