Add YYLO Ledger to Memory tools - #102

What

Adds YYLO Ledger to the Memory tools table (one row, +1/−0), placed with the other open-source coding-agent memory tools:

| YYLO Ledger | Git-native task and Record store with a shell-friendly CLI for coding-agent workflows that need reviewable current state, append-only history, dependency-aware work, and bounded queries | https://pypi.org/project/yylo-ledger/ | Open source | https://github.com/yylo-dev/yylo-ledger | Memory Tool | Git |

Why

YYLO Ledger gives coding agents persistent, reviewable work state: append-only Records (durable evidence of what was done and why), dependency-aware task state, and bounded queries — the same coding-agent persistent-state family as the list's LWC (SQLite wiki CLI) and MemClaw (Felo). It sits beside those rows in the open-source block.

Two notes for your review:

• Storage cell: the table's storage values are Graph/Vector today; YYLO Ledger is honestly Git (git-native records, no graph/vector index). If you'd rather keep the column strictly Graph/Vector, happy to adjust the cell or withdraw the row — your call.
• Description is quoted from the project README's identity sentence.

Disclosure

I'm one of the YYLO Ledger maintainers (yylo-dev), and this PR was prepared with AI assistance following your Contributing notes (name, URL, source model, GitHub URL, category, storage). If the project doesn't fit the list, please feel free to close — no hard feelings.