Organize documentation by moving requirements (HighLevelReqs, Component-*,
lmxproxy_protocol) to docs/requirements/ and test infrastructure docs to
docs/test_infra/. Updates all cross-references in README, CLAUDE.md,
infra/README, component docs, and 23 plan files.
Add per-pattern message timeouts with sensible defaults (120s for deployments, 30s
for queries/commands). Configure Akka.NET transport heartbeat explicitly rather than
relying on framework defaults. Document per-site message ordering guarantee. Specify
that in-flight messages on disconnect result in timeout error (no central buffering)
and debug streams die on any disconnect.
