docs: legal entities — 3 TX LLCs + 3 Side Door non-profits (names TBC)

H22026-business-map.md

@@ -98,6 +98,40 @@ These fall out of the map and need answers as H22026.md takes shape:
 
 ---
 
+## Legal Entities (current, as of 2026-08-14)
+
+All domiciled/registered/nexus-of-operations 100% in **Travis County,
+Texas**.
+
+### For-profit LLCs
+
+| Entity | Notes |
+|---|---|
+| **RackRental.net Operating Company LLC** | The RackRental.net venture |
+| **Suborbital Systems Development Company LLC** | Suborbital Systems (ITAR/CMMC R&D) |
+| **Turnkey Network Systems LLC** | Series LLC (siloed series underneath) |
+
+### Non-profit corporations (Side Door Group)
+
+Charles's recollection (exact names to be confirmed from records):
+
+- Side Door Group Inc
+- Side Door Solutions Group Inc
+- Side Door Solutions PAC Inc
+
+Three entities mapping to the 501c3 / 501c4 / PAC structure.
+
+### Not yet formed (implied by the map)
+
+Redwood Springs Capital Partners, Redwood Family Office, High Flight
+co-ops, the remaining ventures (MerchantsOfHope.org, TeamRental.net,
+ap4ap.org, sol-calc.com, uksrs.org), TSYS Group holding structure.
+
+> Charles will feed in years of notes/writeups; this section is the
+> anchor point for reconciling them.
+
+---
+
 ## Lineage
 
 - Charles has been designing this organization since age 14 (currently