Rename lln_clt to lln_clt_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 lln_clt, 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/lln_clt.md is renamed to lectures/lln_clt_intro.md, and its _toc.yml entry follows it.
• lectures/_config.yml gains lln_clt.md: lln_clt_intro.md under rediraffe_redirects, so the old address redirects to the new one.
• Five links to it are updated, in heavy_tails, markov_chains_II, monte_carlo and observed_distributions (2). No other series links to intro's lln_clt 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) lln_clt.html redirects to lln_clt_intro.html but _build/html/lln_clt.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 fully consistent — toc, redirect, and all five cross-references are updated, no stale references remain, and the unchanged external link and equation label are correctly out of scope.

0 open findings

What changed in this PR

This PR renames the intro series' lln_clt lecture to lln_clt_intro so that lecture names stay unique across QuantEcon's published sites (the lecture-python.myst series publishes a different lln_clt). It is part of a coordinated set of three intro renames (#855, #856, #857) and fits into the monorepo-wide uniqueness effort (QuantEcon/project-monorepo#76).

Changes:

• Renamed lectures/lln_clt.md to lectures/lln_clt_intro.md and updated its _toc.yml entry.
• Added lln_clt.md: lln_clt_intro.md under rediraffe_redirects in lectures/_config.yml so the old URL redirects.
• Updated five {doc} cross-references across heavy_tails, markov_chains_II, monte_carlo, and observed_distributions.

File	Description
lectures/​lln_clt_intro.md	New file (renamed from lln_clt.md); content unchanged
lectures/​_toc.yml	Toc entry updated to lln_clt_intro
lectures/​_config.yml	Added rediraffe redirect from old name to new name
lectures/​heavy_tails.md	Updated {doc} cross-reference to lln_clt_intro
lectures/​markov_chains_II.md	Updated {doc} cross-reference to lln_clt_intro
lectures/​monte_carlo.md	Updated {doc} cross-reference to lln_clt_intro
lectures/​observed_distributions.md	Updated two {doc} cross-references to lln_clt_intro

I verified that no remaining {doc} link in the repo points at the old lln_clt target, the old file is gone and the new file exists, and the redirect/toc entries are consistent. The external link on line 31 (python.quantecon.org/lln_clt.html) correctly remains unchanged because it refers to a different (advanced) series' lecture, and the :label: lln_clt on line 439 is a pre-existing internal math-equation label, not a file reference.

🧠 Review effort: Balanced

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[mmcky]

✅ Translation sync completed (zh-cn)

Target repo: QuantEcon/lecture-intro.zh-cn
Translation PR: QuantEcon/lecture-intro.zh-cn#312
Files synced (6):

• lectures/heavy_tails.md
• lectures/markov_chains_II.md
• lectures/monte_carlo.md
• lectures/observed_distributions.md
• lectures/lln_clt_intro.md
• lectures/_toc.yml