docs/web-ui/README.md now frames itself as the per-hive dashboard (host
approvals, container state, rebuild queue) and points to swarm/ui.md for
swarm-wide day to day, matching the README's swarm-first reframe.
Credentials page fixes: it has only a GitHub PAT tab now (2c7e586f
removed the FORGES tab and moved external forge accounts to the swarm
UI; credentials.html never had a matrix tab).
hivectl/README.md: agents.rs has no create verb (hivectl-cli.md has no
'create' entry; agents.rs's create is swarm-level, swarmctl agent
create). forge.rs reconciles config, it doesn't provision an account;
matrix.rs/github.rs do agent-scoped invites/token writes; gateway.rs
manages the gateway's own htpasswd users — split out of the former
single 'per-integration account/token provisioning' line.
swarm-controller's `InitAgentConfigRepo` node already covers config-repo
creation, so this deletes a duplicate rather than a capability; old
`init_config` rows are skipped by `collect_lenient` with no migration, by
operator decision.
Refs #4398
