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"thumbgate": patch
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Ship `/learn/spec-driven-development` — landing page positioning ThumbGate as the runtime enforcement layer for spec-driven development. The spec-driven workflow (mission.md / tech-stack.md / roadmap.md constitution plus per-feature plan / requirements / validation) is rising as an alternative to vibe coding, but the spec only works if the agent cannot drift outside it. Page makes that gap explicit and positions ThumbGate as the "bailiff" enforcing the spec at the PreToolUse hook layer.

SEO angle: "spec-driven development" + "AI agent spec enforcement" are growing search terms with low competition for the enforcement-layer framing.
