ci: install typos + lychee (Tier-2 quality) - #19

Process completed with exit code 2.

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"rto" should be "to".

"rto" should be "to".

"RTO" should be "TO".

"RTO" should be "TO".

"unparseable" should be "unparsable".

"RTO" should be "TO".

"rto" should be "to".

"RTO" should be "TO".

"RTO" should be "TO".