chore: make this the analytics plugin's own repository

[danielmlr]

Makes this repository the analytics plugin's own: the plugin moves from packages/analytics to the root, and the two unreleased plugins leave. The repository will be renamed to eisbachcode/emdash-plugin-analytics; GitHub redirects the old address.

Do not merge before the two new repositories exist and the rename is done (see the order below).

Changes

• Layout: everything in packages/analytics moves to the root, so GitHub's landing page and the registry's "View source" show the plugin's README. emdash-plugin release plan finds a plugin at the repository root (discoverPluginDirectories in packages/plugin-cli/src/release-prepare.ts, emdash@1.0.1), so emdash-release.yml needs no change.
• Removed: packages/content-freshness and packages/content-link-check move to eisbachcode/emdash-plugin-content-freshness and eisbachcode/emdash-plugin-content-link-check. packages/shared goes: analytics used only clampNumber (now src/values.ts, with its tests) and the type PluginContentItem (now in src/index/bootstrap.ts).
• URLs: repository, homepage and bugs in package.json, repo in the manifest (which the registry profile takes) and the README image URLs point to the new name.
• Root files: one package.json (the plugin's, plus the Changesets scripts), one AGENTS.md (the plugin's, plus what applies from the old workspace file), .claude/CLAUDE.md as the only link to it; pnpm-workspace.yaml keeps its settings without a package list.
• CI: the tests job runs pnpm test; scripts/compat-matrix.sh runs the one suite at the root.
• Changeset: patch, so 0.2.4 publishes the new links to npm.

Verified

• pnpm install, pnpm typecheck, pnpm build: pass.
• pnpm test: 314 passed (the 312 before, plus the two clampNumber tests from the shared package).
• emdash-plugin bundle: finds the plugin at the root; the bundle holds backend.js, manifest.json and README.md (131.5 KB), not the banner.
• scripts/compat-matrix.sh --no-baseline 1.0.1:0.2.6: 314 passed.
• actionlint 1.7.7: no findings on the three workflows.

Order

1. The two new repositories exist with the plugins' code (import of main at 1dea814).
2. Rename this repository to emdash-plugin-analytics (Settings → General).
3. On npmjs.com, the analytics trusted publisher names repository emdash-plugin-analytics (workflow release.yml, environment npm).
4. Merge this PR, then pnpm exec emdash-plugin profile setup --provenance optional -y in a checkout of main.
5. Merge the Version Packages PR: 0.2.4 from the renamed repository.

[changeset-bot]

🦋 Changeset detected

Latest commit: 0ee0b12

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@eisbachcode/emdash-plugin-analytics	Patch

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