homelab: scaffold unified CLI (registry, manifest, claim/release) in infra/cli

Begin evolving the existing infra/cli into the agent-facing "homelab" CLI
decided in the design/grilling session: one composable, JSON-capable surface
for the operations agents run over and over (mined from 51k commands across
2,225 past sessions; the infra inner-loop is ~29% of them). v0.1 targets that
loop — work/tf/claim — and ships here, in place, in infra/cli.

This first slice:
- command registry + dispatcher (longest-prefix verb matching) and a
  `manifest`/`manifest --json` progressive-discovery entrypoint; every verb
  declares a read|write tier so write-gating can be added later (everything is
  allowed for now).
- claim/release verbs wrapping the existing presence script (not reimplemented),
  with label-taxonomy validation.
- main() front-dispatches the homelab verb surface but falls through to the
  legacy webhook -use-case path verbatim, so the in-cluster infra-cli image is
  unaffected.
- fix a pre-existing vet error (glog.Infof missing format directive) that
  blocked `go test`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cli/cmd_claim.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func claimCommands() []Command {
+	return []Command{
+		{Path: []string{"claim"}, Tier: TierWrite,
+			Summary: "claim a shared infra resource on the presence board",
+			Run:     runClaim},
+		{Path: []string{"release"}, Tier: TierWrite,
+			Summary: "release a presence claim",
+			Run:     runRelease},
+	}
+}
+
+// runClaim parses `<kind>:<name> --purpose "..."` in either order (the presence
+// script takes the label first, so we can't rely on Go's flag package which
+// stops at the first positional).
+func runClaim(args []string) error {
+	var label, purpose string
+	for i := 0; i < len(args); i++ {
+		a := args[i]
+		switch {
+		case a == "--purpose" || a == "-purpose":
+			if i+1 < len(args) {
+				purpose = args[i+1]
+				i++
+			}
+		case strings.HasPrefix(a, "--purpose="):
+			purpose = strings.TrimPrefix(a, "--purpose=")
+		case !strings.HasPrefix(a, "-") && label == "":
+			label = a
+		}
+	}
+	if label == "" {
+		return fmt.Errorf(`usage: homelab claim <kind>:<name> --purpose "what + why"`)
+	}
+	return presenceClaim(label, purpose)
+}
+
+func runRelease(args []string) error {
+	var label string
+	for _, a := range args {
+		if !strings.HasPrefix(a, "-") {
+			label = a
+			break
+		}
+	}
+	if label == "" {
+		return fmt.Errorf("usage: homelab release <kind>:<name>")
+	}
+	return presenceRelease(label)
+}