PromptLedger v0.4 — Faster prompt logging, lightweight markers, and better prompt organization

Devlog — Part 4 PromptLedger v0.4 is mostly about making prompt versioning easier to use repeatedly: faster logging, clearer organization, and small release signals for versions worth remembering. In the earlier parts of this series, PromptLedger started as a deliberately small local-first prompt version control tool. Then it gained labels, status semantics, better diffs, review workflows, semantic summaries, warnings, and Markdown export. Those additions made the history more useful after promp