docs(standards): reposition homepage messaging as AI-first

Lead with agents as primary audience. Reframe "Why DevRail?"
around agent non-compliance pain point rather than generic
environment drift.

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

Author: matthew-on-git

content/_index.md

@@ -6,7 +6,7 @@ linkTitle: "DevRail"
 {{% blocks/cover title="DevRail" image_anchor="top" height="full" color="primary" %}}
 One Makefile. One Container. Every Language.
 
-Opinionated development standards for teams that ship with AI agents.
+Guard rails for AI agents and the developers who ship with them.
 
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@@ -97,7 +97,7 @@ See the full [OpenClaw integration guide](/docs/getting-started/agents/#openclaw
 
 ## Why DevRail?
 
-DevRail provides a universal development contract that works the same way for every developer, every CI pipeline, and every AI agent. No more environment drift. No more "works on my machine."
+Your agents don't read your conventions. They skip your linters, ignore your formatters, and commit code that fails CI. DevRail gives them one instruction and one gate -- `make check` -- that enforces every standard automatically. Same contract for your agents, your CI, and you.
 
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