[ tcballard/TokenRelay ] Add Milestone 1 two-exchange staging proof pack (#42)
* feat(staging): add organisation proof pack [roadmap:milestone-1]
Implements the Milestone 1 organisation-scoped hosted proof contract in ROADMAP.md.\n\nAdds a non-secret Alpha/Beta exchange manifest, preparation and completion validation, an operator runbook, and a sanitized evidence template.
* fix(staging): use numeric drain duration [roadmap:milestone-1]
Railway rejects string-valued deploy.drainingSeconds during service config parsing. Use the current numeric schema contract for both API and control.

GitHub
Add Milestone 1 two-exchange staging proof pack (#42) · tcballard/TokenRelay@09dd200
* feat(staging): add organisation proof pack [roadmap:milestone-1]
Implements the Milestone 1 organisation-scoped hosted proof contract in ROADMAP...