docs: add missing readmes for hive-c0re, hive-forge, hivectl

hive-c0re/README.md

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+# hive-c0re
+
+The unprivileged host daemon (runs as `hive-core`). This is the biggest
+crate in the workspace — it owns the sqlite broker, the approval /
+question / reminder / schedule queues, the generic job-DAG queue,
+lifecycle (`nixos-container` shellouts + per-agent flake generation),
+gateway/forge/matrix provisioning, per-container stats, and the axum
+operator dashboard.
+
+`hive-c0re` is **bin-only**: this binary owns the whole module tree
+directly (no separate lib crate). The operator CLI used to live here
+too, but moved out to the standalone `hivectl` crate, which talks to
+this daemon over the host admin socket instead of linking it.
+
+## When to use it
+
+This is where host-level, cross-container orchestration logic lives:
+spawning/rebuilding/destroying agent containers, approving config
+changes, reconciling desired vs. actual container state, provisioning
+per-agent forge/matrix/gateway accounts, and serving the dashboard.
+If you're changing what the operator sees on the dashboard, how a
+container gets spawned or torn down, or anything in the approval flow,
+it's here. Agent-side behavior (the turn loop, MCP tools) lives in
+`hive-agent`/`hive-agent-mcp` instead — this daemon only talks to
+agents over the unix socket wire types in `hive-sh4re`.
+
+## Shape
+
+Cohesive clusters live in directory submodules; each child is
+re-exported at the crate root so `crate::broker::…`-style paths keep
+resolving unchanged regardless of which subdirectory a module actually
+lives in.
+
+- **`dashboard/`** — the axum operator dashboard: managed containers
+  (with deep-links to each container's own web UI), pending approvals
+  (unified diff vs. the applied repo + approve/deny), schedules,
+  questions, journal/build-log viewers, topology, webhook ingest.
+- **`job_queue/`** — generic job-DAG queue + desired-state
+  reconciliation, the host-side wrapper over the domain-agnostic
+  `hive_jobq` scheduler. Jobs are nodes in per-request DAGs
+  (`templates.rs`); special cases (graceful-stop watcher, deferred-start
+  follow-up, meta-update cascade, topology reparents) collapse into DAG
+  *shapes* over the shared node primitives (`model::NodeKind`). See
+  `docs/coordinator.md`.
+- **`lifecycle/`** — `nixos-container` lifecycle (spawn/kill/destroy/
+  rebuild/restart) + per-agent config flake generation.
+- **`stores/`** — sqlite-backed host-side stores: the broker
+  (`broker.rs`), approval / question / schedule queues, build logs,
+  audit trail, power intent, plus the shared connection open/migration
+  helper (`db.rs`).
+- **`workers/`** — background tasks and periodic sweeps: crash/login
+  watcher, scheduled-prompt delivery loop, boot-time auto-update
+  reconcile, the agent-sockets.json writer loop, the MCP socket
+  listener reconcile loop, knowledge-repo sync.
+- **`agent_config/`** — per-agent configuration registries (tool
+  groups, capabilities, resource limits, topology — all JSON under
+  `/var/lib/hyperhive/meta/`) plus the shared wire-protocol size
+  limits. Note the two similarly-named modules: `limits` caps inline
+  message-body sizes on the sockets, while `resource_limits` holds
+  per-agent CPU/memory caps for the container drop-in (`agentMemoryMax`
+  etc.).
+- **`stats/`** — metrics aggregation for the dashboard: hive-wide
+  turn-stats rollups, host-system probes/server warnings, live
+  per-container cgroup load, OTEL metric export.
+- **`socket_server/`** — the unix-socket request server, shared by the
+  per-agent sockets and the (pure-transport) manager socket. The socket
+  file's existence on disk authenticates the caller — connecting to
+  `<.../agents/foo/mcp.sock>` means you are `foo`. No privilege flag:
+  authority derives from the caller's identity (topology, capabilities,
+  tool-group membership), not a hardcoded name match.
+- **`forge/`** — optional Forgejo wiring: per-agent user + token
+  provisioning, config-repo mirroring, meta read-access grants, the CI
+  runner registration, PR auto-merge. No-op when `hive-forge` (the
+  container) isn't running. Full design: `docs/forge.md`.
+- **`coordinator.rs`** — top-level `Coordinator`/`HiveEnv`/`ServeConfig`
+  wiring that ties the above together for `serve`.
+- **`meta.rs`**, **`migrate.rs`** — the meta flake (agent config repos)
+  and schema/state migrations.
+- **`matrix.rs`**, **`gateway_nginx.rs`**, **`webhook_secret.rs`** —
+  matrix provisioning, gateway nginx vhost rendering, webhook secret
+  management.
+- **`priv_client.rs`** — client for the `hive-priv` privileged-helper
+  socket (the few root operations this unprivileged daemon delegates
+  out — see `docs/boundary.md`).
+
+`src/main.rs` is the `hive-c0re` binary entry point: `serve` (the
+daemon) plus the periodic vacuum/sweep loops. See the top-level
+`CLAUDE.md`/`docs/` index for the full reading-path map — this README
+is just the module tour.