fix(commit-msg): reject commit subjects with trailing period

[Copilot]

The commit-msg hook documented a "no trailing period" rule but the regex had no end-of-line anchor, so fix: add parser. passed silently.

Change

Updated PATTERN in git-hooks/commit-msg:

# Before — no end anchor, trailing period accepted
PATTERN="^(${TYPES})(\([a-z0-9]([a-z0-9-]*[a-z0-9])?\))?!?: [a-z].{1,}"

# After — anchored, trailing period rejected, single-char descriptions allowed
PATTERN="^(${TYPES})(\([a-z0-9]([a-z0-9-]*[a-z0-9])?\))?!?: [a-z]([^.]|.*[^.])?$"

• $ anchors the match so the regex can't satisfy itself on a prefix of the subject
• [^.] as the final required character blocks a trailing period
• Optional ? group keeps single-character descriptions (e.g. fix: a) valid

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