data: add Strix startup program

[yunaremaia]

Summary

Data-only PR adding the Strix vendor record (vendors/st/strix.yaml) with its startup program, resolving #770. Reservation: #773.

Facts and sourcing

All facts verified live against the first-party page https://www.strix.ai/startups (HTTP 200 at capture time):

Fact	Source on page	Field
Vendor is Strix (OmniSecure, Inc.), autonomous AI pentesting platform	Page header/footer ("© 2026 Strix", "OmniSecure, Inc."), Features sections	name, description, links.site
50% off Pro for 6 months for eligible early-stage startups	"Startup program Strix for Startups — 50% off Pro for 6 months for eligible early-stage startups"	offer title/summary; economics.benefits[0] (discount, basis_points 5000 exact, duration P6M)
Eligibility: pre-seed to Series A, work email required, manual review	"Eligible startups are pre-seed to Series A, we require a work email, and each application is manually reviewed"	eligibility.rule (manual / not-machine-evaluable)
Application via on-page form	"Apply for Startup pricing" form fields (company name, work email, website, funding stage, amount raised, team size)	access.method: form, access.url

Not captured (not stated on the source page): standalone monetary value of the Pro plan; no separate consideration requirement is established.

Checklist

• Data-only change: one new vendor file, no code
• Fresh ULID-style IDs generated per CONTRIBUTING (ent_01m0t1szz…, prg_… unused, off_01m0t1szz…, src_d65c96b7…)
• Category from canonical taxonomy: auth-security
• Local preflight passes: {"status":"valid","vendors":1,"programs":0,"offers":1}
• DCO signed
• Reservation issue opened (Reservation: Strix for Startups #773)