config: the ecosystem trio and the workstation get their own files (V-410)

Pure move. Praxis, Nexus and Hexis go to ecosystem.go with a note on why
they stay three identical two-field types instead of one shared
EndpointConfig: the block a reader greps for is the service they are
debugging. The workstation block, its two defaults and its normalise arm go
to workstation.go.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

internal/config/workstation.go

@@ -0,0 +1,66 @@
+package config
+
+import (
+	"strings"
+	"time"
+)
+
+// WorkstationConfig — the big model on the owner's desktop (workpc, a
+// 7900 GRE with 16GB), fronted by mavgpud.
+//
+// homesrv cannot grow a GPU, so the resident Qwen3-1.7B is the floor and this
+// is the preferred model above it (owner's call, 2026-08-02, docs/offload.md).
+// The workstation is never assumed up: its card is often held by a CPT run and
+// the machine sleeps. No block, or an empty URL, and homesrv behaves exactly as
+// it does today.
+//
+// Only the prompt crosses the LAN, and the workstation is not "the box". The
+// rules in CLAUDE.md about what may leave still apply.
+type WorkstationConfig struct {
+	// URL — where mavgpud listens, e.g. "http://192.168.1.105:8080". Empty ⇒
+	// the whole block is normalised to nil and nothing probes anything.
+	URL string `json:"url,omitempty"`
+
+	// Health — the admission endpoint. Empty ⇒ URL + "/health", which is what
+	// mavgpud serves. It answers 503 while the card is held, and that is the
+	// signal, so it must be the supervisor's endpoint and not llama-server's.
+	Health string `json:"health,omitempty"`
+
+	// Probe — how often admission is re-checked. 0 ⇒ DefaultWorkstationProbe.
+	// Nothing on the hot path waits for it: the answer is cached and read
+	// atomically, so this only sets how late Maven notices the card came back.
+	Probe Duration `json:"probe,omitempty"`
+
+	// Timeout — the per-request budget for a completion on the workstation.
+	// 0 ⇒ DefaultWorkstationTimeout. A big model on a LAN host is slower than
+	// the resident one, and a request that overruns falls back to the floor.
+	Timeout Duration `json:"timeout,omitempty"`
+}
+
+// Workstation defaults, applied in normaliseWorkstation.
+const (
+	DefaultWorkstationProbe   = 15 * time.Second
+	DefaultWorkstationTimeout = 90 * time.Second
+)
+
+// normaliseWorkstation applies the block's defaults. No address, no preferred
+// model: an unconfigured workstation is the default deploy and must be
+// indistinguishable from today.
+func (c *Config) normaliseWorkstation() {
+	if c.Workstation != nil && strings.TrimSpace(c.Workstation.URL) == "" {
+		c.Workstation = nil
+	}
+	if c.Workstation == nil {
+		return
+	}
+	w := c.Workstation
+	if strings.TrimSpace(w.Health) == "" {
+		w.Health = strings.TrimRight(w.URL, "/") + "/health"
+	}
+	if w.Probe <= 0 {
+		w.Probe = Duration(DefaultWorkstationProbe)
+	}
+	if w.Timeout <= 0 {
+		w.Timeout = Duration(DefaultWorkstationTimeout)
+	}
+}