docs: add jilog to Community Applications

[Joi]

Summary

• Responds to the "Want to showcase your application?" invitation in the Community Applications section: adds one row for jilog — an append-only event ledger and nightly learning loop over Amplifier, Claude Code, and NanoClaw session transcripts.
• Repo: https://github.com/Joi/jilog — MIT, Rust, v0.4.0, production-tested on the author's fleet (its built-in Amplifier reader scans session transcripts nightly).

Test plan

• Doc-only change; git diff --stat = 1 file, 1 insertion. Row follows the existing table format (matches the app-session-analyzer precedent row).

Generated with Amplifier

[Joi]

Withdrawing — decided not to register jilog in the community list at this time. (The dead-link cleanup in #349 stands on its own.)