docs: consolidate architecture docs into bible

docs/bible/05-collectors.md

@@ -1,7 +1,12 @@
 # 05 — Collectors
 
 Collectors live in `internal/collector/`.
-Registration: `internal/collector/registry.go`
+
+Core files:
+- `internal/collector/registry.go` — connector registry (`redfish`, `ipmi`)
+- `internal/collector/redfish.go` — real Redfish connector
+- `internal/collector/ipmi_mock.go` — IPMI mock connector scaffold
+- `internal/collector/types.go` — request/progress contracts
 
 ---
 
@@ -9,6 +14,13 @@ Registration: `internal/collector/registry.go`
 
 **Status:** Production-ready.
 
+### Request contract (from server)
+
+Passed through from `/api/collect` after validation:
+- `host`, `port`, `username`
+- `auth_type=password|token` (+ matching credential field)
+- `tls_mode=strict|insecure`
+
 ### Discovery
 
 Dynamic — does not assume fixed paths. Discovers:
@@ -47,6 +59,7 @@ When adding Redfish mappings, follow these principles:
 
 The collector emits progress log entries at each stage (connecting, enumerating systems,
 collecting CPUs, etc.) so the UI can display meaningful status.
+Current progress message strings are user-facing and may be localized.
 
 ---