docs: retire the public-beta label and document v0.92.0 capabilities (#1398)

Sencho exits public beta after a clean v0.92.0 QA pass. Replace the global
"public beta on the path to v1.0" callout with scoped maturity language across
the README, KNOWN_LIMITATIONS, quickstart, troubleshooting, upgrade, and the
security-architecture reference. The copy stays honestly pre-1.0 and avoids a
blanket "stable" claim.

Reframe the Scale limitations to credit QA, audit, and end-to-end validation
while keeping the honest caveat that large-scale performance is not yet
benchmarked.

Fold the new v0.92.0 capabilities into the README sections: Compose Doctor
preflight checks, health-gated updates with stalled-update recovery, file
move/rename in the explorer, ordered multi-file Compose for Git sources, the
Security overview, on-demand node-wide scans, the Compose network inspector
with an exposure-intent guard, scan policy packs, documentation-drift flags,
and configurable image-update cadence with registry/source links.

docs/getting-started/quickstart.mdx

@@ -6,7 +6,7 @@ description: Get Sencho running in under five minutes.
 This walks you from a clean Docker host to a working Sencho console. Five minutes if your Compose directory is already in the right place, ten if you need to lay it out first.
 
 <Note>
-  Sencho is currently in public beta on the path to v1.0. Core workflows are actively tested, but early users should review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and avoid deploying it blindly on critical infrastructure without testing in their own environment first.
+  Sencho is used in production for day-to-day Docker Compose and fleet management. As a pre-1.0 project it still evolves quickly, so review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and validate against your own setup before deploying it on critical infrastructure.
 </Note>
 
 ## Prerequisites

docs/operations/troubleshooting.mdx

@@ -4,7 +4,7 @@ description: Solutions to the most common Sencho setup and runtime problems.
 ---
 
 <Note>
-  Sencho is currently in public beta on the path to v1.0. Core workflows are actively tested, but early users should review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and avoid deploying it blindly on critical infrastructure without testing in their own environment first.
+  Sencho is used in production for day-to-day Docker Compose and fleet management. As a pre-1.0 project it still evolves quickly, so review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and validate against your own setup before deploying it on critical infrastructure.
 </Note>
 
 If something has broken and you want a quick "what do I do now?" overview rather than a specific symptom, start with the [Recovery guide](/operations/recovery). It walks through getting back to a working state when Sencho, a deploy, sign-in, Docker, or a remote node fails, and links back here for the details.

docs/operations/upgrade.mdx

@@ -4,7 +4,7 @@ description: How to update Sencho, what happens during upgrades, and the version
 ---
 
 <Note>
-  Sencho is currently in public beta on the path to v1.0. Core workflows are actively tested, but early users should review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and avoid deploying it blindly on critical infrastructure without testing in their own environment first.
+  Sencho is used in production for day-to-day Docker Compose and fleet management. As a pre-1.0 project it still evolves quickly, so review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and validate against your own setup before deploying it on critical infrastructure.
 </Note>
 
 ## Upgrade steps

docs/reference/security.mdx

@@ -6,7 +6,7 @@ description: How Sencho protects your infrastructure with layered authentication
 Sencho applies defense-in-depth across authentication, authorization, encryption, and auditing. All security features ship with sensible defaults and work out of the box on a fresh install.
 
 <Note>
-  Sencho is currently in public beta on the path to v1.0. Core workflows are actively tested, but early users should review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and avoid deploying it blindly on critical infrastructure without testing in their own environment first.
+  Sencho is used in production for day-to-day Docker Compose and fleet management. As a pre-1.0 project it still evolves quickly, so review the [known limitations](https://github.com/studio-saelix/sencho/blob/main/KNOWN_LIMITATIONS.md) and validate against your own setup before deploying it on critical infrastructure.
 </Note>
 
 ## The authentication stack