The last docs/ piece of the manager-cleanup. The manager is no longer a
structural role — root-ness is purely topological. Reframe:
- title 'Approvals + manager + helper events' -> 'Approvals + helper events'
- section headers: 'Manager view of applied'/'Manager policy'/'Manager
(ruth) is hive-c0re-managed'/'Helper events to the manager' ->
root-agent / root-bootstrap-container equivalents
- body prose: 'the manager (ruth)' -> 'the root agent' (or 'the submitter'
in the approval-flow steps)
- authority semantics: 'manager-only' -> approvals are submitted by an
agent with the approvals tool group, for its direct children
- dropped the stale 'the manager refuses to destroy itself' line (the
bootstrap container is now destroyable + transient; recreated on startup)
Kept the genuine code/protocol identifiers (nixosConfigurations.manager,
manager_server, role:manager prompt block, notify_manager, the
/run/hyperhive/manager/ socket path) — renaming those would diverge from
the source (de-hardcoding is its own backend cleanup).
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