Delete committed dataset orphans (Track X)

[mmcky]

Deletes both committed copies of web_graph_data.txt — the _static/lecture_specific/finite_markov/ copy and the stray one at the lectures/ root — and adds the root path to .gitignore. finite_markov.md writes the file with %%file before reading it, so neither copy is ever consumed.

Published surface and settle. The _static copy serves at 200 (296 B) on python.quantecon.org today; the root copy is not served. This repo has no _build/html prune yet (QuantEcon/workspace-lectures#41 rollout), so the file clears on the settle policy: the next Monday clean cache.yml rebuild followed by the next publish* tag (last publish publish-2026aug14). Nothing reads it in the meantime.

Rows for QuantEcon/workspace-lectures#40 (published URL, measured today with a 200 page control and a 404 never-existed control on the same host; expect 404 after the settle):

path	today
/_static/lecture_specific/finite_markov/web_graph_data.txt	200, 296 B

lecture-python.zh-cn holds both copies too and deletes them in the PR of the same title, together with its copies of the Track B files this repo deleted in #1035 and #1037.

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

[Copilot]

Pull request overview

Removes two committed orphan copies of web_graph_data.txt (one at lectures/ root and one under _static/lecture_specific/finite_markov/) and prevents the root copy from being re-committed, relying on lectures/finite_markov.md generating the file at build time via %%file.

Changes:

• Delete lectures/web_graph_data.txt.
• Delete lectures/_static/lecture_specific/finite_markov/web_graph_data.txt.
• Add lectures/web_graph_data.txt to .gitignore with a clarifying comment.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
lectures/web_graph_data.txt	Removes the committed root copy of the generated graph data file.
lectures/_static/lecture_specific/finite_markov/web_graph_data.txt	Removes the committed _static copy that is no longer needed.
.gitignore	Ignores the regenerated lectures/web_graph_data.txt to avoid re-committing it.

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[github-actions]

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Preview URL: https://pr-1048--sunny-cactus-210e3e.netlify.app

Commit: 9d2aef6

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Build Info

• Workflow: Build Project [using jupyter-book]

[mmcky]

Validation (2026-09-01, preview pr-1048--sunny-cactus): root web_graph_data.txt → 404; finite_markov.html → 200 (176,555 B) and its rendered page carries the %%file web_graph_data.txt cell with no _static/lecture_specific/finite_markov reference. Build log: 0 warnings mentioning the basename. Expected exception: _static/lecture_specific/finite_markov/web_graph_data.txt still serves at 200 (296 B) on the preview — the restored build-cache is the 2026-08-31T05:10Z one, built from main. (This is the stale-_build behaviour from QuantEcon/workspace-lectures#41: the preview restored the build-cache artifact built from main before this branch existed, and this repo has no jb clean . --html prune yet, so the restored copies are re-shipped. It says nothing about the PR; on the live site they clear on the settle policy recorded in the PR body.)