Track cumulative clones: preserve history and add total_count with updated badge

[Sendipad]

Motivation

• The clone badge and published stats only reflected GitHub’s 14-day rolling window, so the repository lacked a durable cumulative clone total.
• Preserve historical daily snapshots so an all-time running total can be computed and displayed permanently.

Description

• Updated .github/workflows/clone-stats.yml to restore stats/clone_history.json from the stats branch when present, merge it with the fresh traffic.clones payload, deduplicate by timestamp, and compute a cumulative total_count using jq.
• The workflow now writes stats/clone_history.json and publishes stats/clones.json with fields count, uniques, and the new total_count field.
• Added stats/clone_history.json to the files staged by the workflow and updated stats/README.md to document the new artifacts and total_count semantics.
• Updated the top-level README.md badge to query total_count (all-time) instead of the 14-day count.

Testing

• Inspected the resulting workflow and files with nl -ba .github/workflows/clone-stats.yml, nl -ba README.md, and nl -ba stats/README.md to confirm the intended changes were present.
• Ran git diff --check and git status --short to validate the working tree state, both of which completed without error.
• Attempted to parse the workflow YAML with a small Python script using PyYAML which failed because the environment lacked the PyYAML package, so YAML parsing could not be executed here.

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Codex Task