Update AI.md with current Hugo and content maintenance workflows

[cloudartisan]

Summary

• document the repo's current Hugo module sync and production build commands
• add PR validation commands for config, drafts, future posts, and build checks
• add content maintenance commands for book and movie data scripts

Testing

• Not run (not requested)

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid recommending post script that uses local timezone date

This new command recommends ./scripts/create-post-pr.sh, but that script derives CURRENT_DATE from plain date (scripts/create-post-pr.sh:16), which uses the caller's local timezone rather than Australia/Sydney. In timezones like US/EU, running it near day boundaries can create posts with a one-day-shifted filename/front matter date, which then affects chronological ordering and draft/future checks; the guide should either call out the timezone caveat or require a Sydney timezone when invoking the script.

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