docs: remove version labels from public docs to avoid telegraphing roadmap

Strip explicit V2/V3 version labels from planned features in README,
architecture, connectors, and demo docs. F5/IIS now say "interface only"
and "implementation planned" without version targets. DigiCert and other
future issuers say "planned" without version numbers. Keeps completed
milestones detailed (social proof) while keeping future work abstract.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -292,7 +292,7 @@ GET    /ready                             Readiness check
 | Local CA (self-signed + sub-CA) | Implemented | `GenericCA` |
 | ACME v2 (Let's Encrypt, Sectigo) | Implemented (HTTP-01 + DNS-01) | `ACME` |
 | step-ca | Implemented | `StepCA` |
-| OpenSSL / Custom CA | Planned (V2) | — |
+| OpenSSL / Custom CA | Planned | — |
 | Vault PKI | Planned | — |
 | DigiCert | Planned | — |
 
@@ -304,8 +304,8 @@ GET    /ready                             Readiness check
 | NGINX | Implemented | `NGINX` |
 | Apache httpd | Implemented | `Apache` |
 | HAProxy | Implemented | `HAProxy` |
-| F5 BIG-IP | Interface only (V2) | `F5` |
-| Microsoft IIS | Interface only (V2) | `IIS` |
+| F5 BIG-IP | Interface only | `F5` |
+| Microsoft IIS | Interface only | `IIS` |
 | Kubernetes Secrets | Planned | — |
 
 ### Notifiers