fix(root): repair invalid package.json that broke npm install

[sandrawillow001-afk]

Problem

package.json at the repo root is not valid JSON. The scripts block is missing a comma after "release": "semantic-release" and re-declares "dev", which was already defined a few lines above:

"release": "semantic-release"
"dev": "turbo run dev"

Because the manifest cannot be parsed, npm aborts before resolving a single workspace:

npm error JSON.parse Expected ',' or '}' after property value in JSON at position 1790 (line 36 column 5)

Impact

• npm install / npm ci fail for every contributor.
• Any CI job that installs dependencies at the root fails before running.
• Frontend tests cannot even load: vitest.config.ts resolution walks up to the root manifest and dies with Expected "," in JSON but found "\"dev\"".
• The broken state is present on main (introduced in Add load testing, disaster recovery, exports, and cohort retention #900).

Fix

Remove the duplicated "dev" key, which leaves the trailing comma issue moot and keeps the first "dev": "turbo run dev" definition.

Verification

python3 -c "import json; json.load(open('package.json'))"   # valid
npm install --no-audit --no-fund --ignore-scripts          # resolves all workspaces

With this applied, the root install completes and workspace test tooling becomes runnable.

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