planetary shielding without relics?

I think you eventually get them if you research Shields far enough. I know in the game I'm playing I've got both a Planetary Shield facility (from research) and a Massive Planetary Shield facility (from relics), both of which provide 15,000 shield points for the planet. Which is a bit odd, methinks. The relic version, being "Massive" and all, should provide more shield points than a regular planetary shield, no?

Suction feet are not to be trifled with!

No not without moding the tech tree a bit which is not hard the relic shields work like ship shields exept that instead of a component they give you a facility which gives shields to planets. The other planetery shields are a protection against planet destroying weapons for the first one and system destroying weapons (black hole & nebulae creators) they also stop more benign stelar manipulation in the protected system

Stock does not have planetary shield generators that are not from ruins. Agent Zero must be referring to the Balance Mod, where you can research planetary shield generators via the planetary defenses tech area.

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Space Empires Depot | SE:V Balance Mod

There are shield defences in stock got from the same tech but as I said they counter stellar manipulation and dont work like ships shields which is what the relic tech shields do and the ones from the Balence Mod also do

Indeed, I am referring to the Balance Mod, because stock isn't worth playing.

Suction feet are not to be trifled with!