Rename mle to mle_intro so lecture names are unique across the published sites

[mmcky]

Part of QuantEcon/project-monorepo#76. QuantEcon/lecture-python.myst publishes a different lecture as mle, and the lectures monorepo needs every lecture name to be unique across the published sites. QuantEcon/project-monorepo#75 ruled that the intro side takes an _intro suffix.

What this changes

• lectures/mle.md is renamed to lectures/mle_intro.md, and its _toc.yml entry follows it.
• lectures/_config.yml gains mle.md: mle_intro.md under rediraffe_redirects, so the old address redirects to the new one.
• Five links to it are updated, in fitting_distributions (2) and wealth_tax (3). No other series links to intro's mle by name; I checked all six.
• Checked on the branch:
  • the redirect's old file is gone and its new file exists;
  • every _toc.yml entry has a file;
  • no {doc} link points at a missing file.

The translation hold is cleared: action-translation v0.29.4 (2026-10-09) carries QuantEcon/action-translation#291, and v0, which sync-translations-zh-cn.yml runs, now points at it. This PR stays a draft until the one before it has merged and this one is rebased.

• Why the hold: the rename reaches lecture-intro.zh-cn through the series' own translation sync. Until Labels for figures in long_run_growth #291 lands, that sync overwrites the edition's localised _toc.yml part captions (Sync overwrites localised _toc.yml part captions with English, and nothing detects it action-translation#254).
• After the sync has carried the rename to lecture-intro.zh-cn: the edition's own lectures/_config.yml needs the same rediraffe_redirects line. It cannot land earlier, because rediraffe checks that the old file is gone.
• The three intro renames are separate PRs, so that each reaches the edition on its own. They are Rename lake_model to lake_model_intro so lecture names are unique across the published sites #855 (lake_model), Rename lln_clt to lln_clt_intro so lecture names are unique across the published sites #856 (lln_clt) and Rename mle to mle_intro so lecture names are unique across the published sites #857 (mle). All three add their redirect at the same place in _config.yml, so after one merges, the next needs a rebase before it can merge.

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[mmcky]

The red checks are expected.

What fails: the HTML build stops on one warning and nothing else: (broken) mle.html redirects to mle_intro.html but _build/html/mle.html already exists!.

Why: CI restores the build cache that cache.yml built from main. That cache still holds the old page, and rediraffe overwrites only the redirect pages it wrote itself. The other builds pass.

How it lands: each of the three intro PRs stays red until it is merged. After each merge:

1. Run cache.yml on main.
2. Push no publish* tag until that run is green.
3. Then rebase the next PR.

This is on top of the hold for QuantEcon/action-translation#291.

[Copilot]

🟢 Approval recommended

The rename is complete and internally consistent—all five cross-references, the TOC entry, and the rediraffe redirect are correctly updated with no stale references remaining.

0 open findings

What changed in this PR

This PR renames the introductory mle lecture to mle_intro so that lecture names are unique across QuantEcon's published sites (the lecture-python.myst series already publishes a different mle lecture). It is part of a coordinated series of three intro renames (#855 lake_model, #856 lln_clt, #857 mle) tracked under QuantEcon/project-monorepo#76. The change is purely organizational—content is moved, not modified—and preserves the old URL via a rediraffe redirect.

Changes:

• Rename lectures/mle.md → lectures/mle_intro.md and update its _toc.yml entry.
• Add mle.md: mle_intro.md under rediraffe_redirects in _config.yml so the old address redirects.
• Update all 5 {doc} cross-references (2 in fitting_distributions.md, 3 in wealth_tax.md).

File	Description
lectures/​mle_intro.md	Renamed from mle.md; content unchanged, internal {ref}/label anchors are file-independent and remain valid
lectures/​_toc.yml	TOC entry updated from mle to mle_intro
lectures/​_config.yml	Adds rediraffe redirect mle.md: mle_intro.md, grouped with sibling redirects
lectures/​fitting_distributions.md	Two {doc}mle`` references updated to mle_intro
lectures/​wealth_tax.md	Three {doc}mle`` references updated to mle_intro (one with `<mle_intro>` link text)

I verified via a full-repository search that no stale {doc}mle``, <mle>, or `mle.md`/`mle.html` references remain, the old file is gone, the new file exists, and the `_toc.yml` entry and `_config.yml` redirect are correctly placed. The rename is complete and consistent, matching the pattern of the sibling PRs. I found no issues to flag.

🧠 Review effort: Balanced

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