docs(architecture): crystallize LEGION-10k scaling limits

[borjamoskv]

This document details the scaling limits and architecture of the LEGION-10k swarm execution engine, including verified throughput metrics, interop latency, and OutboxDaemon dispatch patterns.

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█ EPISTEMIC HUMILITY CHECKLIST

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• Determinism: I have not introduced any stochastic behaviour in the core runtime without deterministic guards.
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∞ MÖBIUS — PR Analysis

Metric	Value
Files changed	1
Total changes	188 (+/-)
Complexity	medium
Est. review time	15 min
Has tests?	⚠️ Missing
Has Rust changes?	No

Labels applied: documentation

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No test files detected in this PR. Consider adding tests.

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