[Chemaclass]

The docs hold hundreds of ; => value comments inside Phel code blocks, and the snippet suite only checked that each block runs. A wrong value could sit there for years. The suite now rewrites every form ; => value (or a ; => value line right below the form) into a check and fails on a mismatch, using the same baseline and ratchet it already has for blocks that cannot run. Mismatch reports start on a new line so output from print cannot hide a wrong result; an end-to-end regression covers this case. Lines whose expected text is not data (..., "instance", #') are skipped and listed under --verbose.

First value caught: (assoc p :x 10) on the data structures page said (point 10 2); Phel prints (user.point 10 2).

Also in this PR

• npm run check:docs (scripts/check-docs.js) checks every docs page, and CI runs it: a description of 50 to 160 characters, a difficulty on every language page, ; => and ; prints with one semicolon, the callout component instead of a blockquote, no Phel release older than config.toml outside upgrading.md, a lead paragraph before the first H2, and no H1 in the body. The 21 pages that broke a rule are fixed. The error reference intro is now a plain paragraph, since that page skips templating and cannot use the callout.

• CI runs npm run check:links after zola build. zola check only follows @/ links, and this site writes absolute ones.

• Aliases for old URLs that 404 today: /documentation/guides/phel-for-php-developers, /documentation/language/arithmetic, /documentation/language/truth-and-boolean-operations, /documentation/numbers-and-arithmetic, /documentation/reference/one-liners, /documentation/debug, /documentation/debug/php-tools, /documentation/debug/phel-helpers, /documentation/commands, /documentation/tutorials, /documentation/tooling/authoring-libraries, /documentation/reference/in-the-wild. /documentation/guides/ai already redirects through static/.htaccess.

• Each core language page links to its practice module: practice = [...] in the front matter renders one tip card at the end of the page.

• Sidebar links no longer replay the slide-in animation on navigation. Sections open and close immediately, and link transitions only animate colors so collapsed links leave view and the tab order immediately.

Checked

• composer test:snippets: 554 snippets pass, 869 documented values checked, 0 mismatches, empty baseline.

• vendor/bin/phpunit (135 tests) and composer phpstan.

• npm run check:docs: 0 problems. zola build, zola check --skip-external-links and npm run check:links: 9816 links, 0 broken.

• Sidebar navigation and all six section toggles checked with mouse and keyboard at 1440px and 390px, in light and dark themes. No horizontal overflow.

• CSS formatting passes. CSS lint has 50 existing errors in the two changed files, with no new errors.