Module log 

Parsing, building, and updating log.md update histories.

A log is a flat list of date-grouped entries, newest first:

# Directory Update Log

## 2026-05-22
* **Update**: Added a new table reference.
* **Creation**: Established the playbook.

Date headings use ISO-8601 YYYY-MM-DD. The leading bold word (**Update**, **Creation**, …) is a convention, not a requirement.

Structs

Log

A parsed log.md.

LogDay

All entries recorded under a single date heading.

LogEntry

A single log bullet.

Functions

append_log_entry

Appends an entry to log.md in the bundle root, creating the file if needed.

is_iso_date

Checks that a string is a valid ISO-8601 calendar date (YYYY-MM-DD).