french_rev: delete the five local copies, now that the site is published

[mmcky]

Phase 2 of the french_rev repoint, and the last step of set 3. #826 moved the reads to data-lectures but deliberately kept these five files in place; publish-2026aug07 has now refreshed the site, so they are unreferenced and safe to remove.

This is repoint rule 3: repoint, publish, then delete. Deleting in the repoint PR is what 404'd the published long_run_growth notebook during set 1, because the site lags main until a publish* tag is cut.

Verified against the deployed artifact, not main

That distinction is the whole point of the split, so the check was run on what readers actually fetch:

Check	Result
intro.quantecon.org/_notebooks/french_rev.ipynb	HTTP 200
— data-lectures references	4
— lectures/datasets/ references	0
— local-path np.load('datasets/…')	none
quantecon.github.io/lecture-wasm/french-rev/	HTTP 200
— references to this repo	0
— raw.githubusercontent.com/QuantEcon/data-lectures reads	5

An org-wide sweep over every repo's origin/main finds no remaining reader of these five paths. The only matches are data-lectures' own sidecar manifests and its audit annotations, neither of which is a read.

fig_3.ods is deliberately kept

QuantEcon/lecture-wasm#55 deleted wasm's fig_3.ods because it was a redundant mirror. This repo's copy is different: it is the last one in the org, since data-lectures dropped it during the restructure as a verified format twin of fig_3.xlsx with no consumers. Removing it is a data-retention decision rather than a repoint, so it belongs to the orphan sweep (Track X) alongside the two other files left in this directory, not here.

After this

Set 3 is complete. migration.yml already records all five as repointed with both consumers, and the strict audit is green.

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[mmcky]

Correction to this PR's fig_3.ods retention rationale, for whoever picks it up in the orphan sweep.

This PR kept fig_3.ods on the stated grounds that it is "the last one in the org", and handed the retention decision to Track X on that basis. It is not the last copy. A Trees-API scan of all QuantEcon repos on their default branches finds blob 5d6ae11c (30,366 B) on four non-archived repos, one of them the actively-maintained lecture-intro.zh-cn. gh search code -f q='filename:fig_3.ods org:QuantEcon' returns 0 despite those copies existing, which is the usual reason this kind of claim goes unchallenged.

So removing it is not a data-retention decision at all — it is an ordinary orphan deletion, and the same is true of the copy sitting in lecture-intro.zh-cn. Separately, fig_3.ods and fig_3.xlsx are verified content-equal: both parse to a single sheet of identical shape (34×6) with identical dtypes, DataFrame.equals returns true, and neither carries a formula or any provenance the other lacks. Track X can take both.

One more thing about this PR worth recording where the claim was made rather than only in the tracker. Its pre-deletion sweep was described as covering every repo's origin/main; it covered this workspace's nine clones. Re-run properly against the organisation, it turns up two published QuantEcon sites that still read the paths this PR deleted and are serving 404s today — QuantEcon/workspace-lectures#28. The rule that follows is in QuantEcon/data-lectures#53: a pre-deletion sweep enumerates the org, not manifest.yml, and gh search code cannot find a bare URL, so it has to be clone-and-grep or a Trees-API pass.

Found by an independent review of QuantEcon/workspace-lectures#23. Nothing here needs undoing in this PR — it is context for the sweep that follows.