Fix clone stats workflow writing wrong file path

[Sendipad]

Motivation

• The scheduled workflow attempted to commit stats/clones.json but previously wrote clones.json to the repository root, causing fatal: pathspec 'stats/clones.json' did not match any files.
• Ensure the workflow writes the artifact to the same path it later stages and pushes so runs no longer fail.

Description

• Updated .github/workflows/clone-stats.yml so the Extract step creates the stats directory and writes the JSON to stats/clones.json instead of the repo root.
• Added mkdir -p stats before writing to guarantee the directory exists.
• No changes outside the workflow file were required.

Testing

• Ran a local simulation of the Extract step with echo '{"count": 12}' > traffic.json && COUNT=$(jq '.count' traffic.json) && mkdir -p stats && echo "{ \"count\": $COUNT }" > stats/clones.json && cat stats/clones.json, which produced the expected JSON payload and file path.
• Verified git status and committed the workflow change with git add .github/workflows/clone-stats.yml && git commit -m "Fix clone stats workflow output path", which succeeded.
• Confirmed the workflow file diff contains the mkdir -p stats and target stats/clones.json updates and that no tests or other CI steps were broken by this change.

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Codex Task