Stamp dist bundles with an MIT license notice using a minifier-safe `/*!` header

[jackgranatowski]

Problem

The dist bundle headers currently read:

/* SLASHED v0.6.33 — slashed.optimal.css */

Two issues:

1. No license notice. MIT's only real requirement is that the copyright + permission notice travels with the code. Consumers who copy a bundle (including the WordPress plugin, which redistributes these files under a GPL-3 plugin) get no in-file indication of the license.
2. The comment is stripped on minification. A plain /* … */ header is removed by minifiers, so .min.css files carry no attribution at all.

Proposed fix

Follow the convention used by normalize.css and similar libraries — a bang comment, which minifiers preserve:

/*! SLASHED v0.6.33 | MIT License | github.com/codeslash-dev/SLASHED */

Scope

• scripts/bundle.js — change the stamp format for all emitted bundles (readable, .min, and .flat variants).
• release.yml verifies the stamp version against package.json before publishing — the check needs updating to match the new header format.
• CLAUDE.md references the /* SLASHED vX.Y.Z */ header format in the version-sync table; update the wording.
• Check whether scripts/check-version-sync.js and any tests (e.g. bundle/docs sync tests) parse the current header format.

Follow-up (SLASHED-Plugins)

After this ships in a framework release, npm run update-framework in SLASHED-Plugins picks up the stamped bundles automatically — no plugin-side change needed, but worth confirming nothing there parses the old header format either.

[jackgranatowski]

Fixed in #509 (merged): scripts/bundle.js now stamps every emitted bundle with /*! SLASHED vX.Y.Z ... | MIT License | github.com/codeslash-dev/SLASHED */ — a minifier-safe bang-comment carrying the license notice, replacing the plain comment that minifiers stripped. CLAUDE.md updated to match.

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