🖋️ Scribe: regex breakdown comment

[fderuiter]

🖋️ Scribe: [regex breakdown comment]

💡 What:
Added a detailed line-by-line breakdown comment above the _ISO8601_FRAC_REGEX regular expression in src/imednet/utils/dates.py.

🎯 Why:
The regex used to parse ISO-8601 strings and fractional seconds for backwards compatibility was complex and lacked documentation. This required developers to mentally deconstruct the expression (lookaheads, optional boundaries) to understand its behavior and limits.

🧠 Cognitive Impact:
Reduces the "Time to Understand" by instantly clarifying the syntax and intent of the regular expression, eliminating ambiguity around how fractional seconds and time zone offsets are matched.

📖 Preview:

# Breakdown of _ISO8601_FRAC_REGEX:
# \.               - Matches the literal dot preceding fractional seconds
# (\d+)            - Captures one or more digits (the fractional seconds)
# (?=              - Positive lookahead to ensure the fraction is followed by:
#   [+-]\d{2}:\d{2} - A timezone offset (e.g., +00:00, -05:00)
#   |               - OR
#   $               - The end of the string (e.g., implicitly UTC if 'Z' was stripped)
# )
_ISO8601_FRAC_REGEX = re.compile(r"\.(\d+)(?=[+-]\d{2}:\d{2}|$)")

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PR created automatically by Jules for task 5330415148176077774 started by @fderuiter

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