enhancement

[edouardmisset]

Depends on: #26

What to build

After each benchmark run, generate a machine-readable benchmarks/latest.json summarizing current results for fast PR checks and tooling.

Acceptance criteria

• benchmarks/latest.json created/updated after each deno task bench run
• JSON schema includes: timestamp, gitCommit, results[] (workspace, functionName, canonicalName, fixtureSize, stats)
• File is stable (safe to diff in git)
• Tooling can read latest results without scanning full history
• Latest.json is generated in both normal and --baseline modes

Out of scope

• HTML rendering