chore: sync dependency/CI/TS/wiki layout with Modern.TiddlyDev

[linonetwo]

Sync baseline with Modern.TiddlyDev: dependency versions, GitHub Action versions, TS config, and wiki system/tests layout.

[Copilot]

Pull request overview

Syncs this repo’s baseline with Modern.TiddlyDev by updating TypeScript/Node configuration and aligning the wiki’s system + test layout (including bundled plugins and plugin-library sources).

Changes:

• Add wiki system configuration for filesystem path mapping and include new system/plugin tiddlers (CodeMirror + CPL repo).
• Restructure/seed wiki test directories (example + playwright).
• Update TypeScript config (NodeNext module settings, types/includes) and raise Node engine requirement to >=20.

Reviewed changes

Copilot reviewed 4 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
wiki/tiddlers/tests/playwright/.gitkeep	Adds placeholder for playwright test tiddlers directory.
wiki/tiddlers/tests/example/.gitkeep	Adds placeholder for example test tiddlers directory.
wiki/tiddlers/system/FileSystemPaths.tid	Adds filesystem path filter configuration for system tiddlers.
wiki/tiddlers/system/$__plugins_tiddlywiki_codemirror.json.meta	Adds CodeMirror plugin metadata to the wiki.
wiki/tiddlers/system/$__plugins_tiddlywiki_codemirror.json	Adds bundled CodeMirror plugin payload/config to the wiki.
wiki/tiddlers/system/$__plugins_Gk0Wk_CPL-Repo.json.meta	Adds CPL repo plugin metadata to the wiki.
wiki/tiddlers/system/$__plugins_Gk0Wk_CPL-Repo.json	Adds CPL repo plugin payload (plugin library entries/content).
tsconfig.json	Switches to NodeNext module settings and updates included paths/types.
package.json	Raises required Node version to >=20.

Comments suppressed due to low confidence (2)

wiki/tiddlers/tests/playwright/.gitkeep:2

• These .gitkeep placeholder files currently contain blank lines. Consider making them truly empty (0 bytes) to avoid unnecessary diffs/whitespace noise and keep the intent of .gitkeep clear.
  wiki/tiddlers/tests/example/.gitkeep:2
• This .gitkeep placeholder file currently contains blank lines. Consider making it truly empty (0 bytes) to avoid unnecessary diffs/whitespace noise and keep the intent of .gitkeep clear.

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