Rename Castle -> Wild PC across the repo

Repo-side rename only (Phases 1-3 of the migration plan); the live box
(~/.castle, systemd units, /data/castle, domains) is a separate cutover.

- Slug `castle` -> `wildpc`: CLI command, module names (wildpc_core/cli/api),
  dist names, entry point `wildpc = wildpc_cli.main:main`.
- Identifiers: CastleConfig/NATSClient/DirError/MDNS -> Wildpc*.
- Env/constants: CASTLE_* -> WILDPC_*; ~/.castle -> ~/.wildpc, castle.yaml ->
  wildpc.yaml, /data/castle -> /data/wildpc.
- Systemd UNIT_PREFIX castle- -> wildpc-; own programs castle-api/gateway/etc.
- Display prose "Castle" -> "Wild PC" in docs, agent-guide files, README, frontend.
- Package dirs and bootstrap yaml renamed via git mv; lockfiles regenerated;
  redundant nested uv.lock files dropped (workspace root lock is authoritative).

Tests: core 273, cli 47, wildpc-api 120 all pass. Frontend type-checks + builds.
Fixed a stale test fixture (secret_env_path kind arg) broken pre-rename.

app/src/components/detail/ConfigPanel.tsx

@@ -26,7 +26,7 @@ export function ConfigPanel({ deployment, configSection, onRefetch }: ConfigPane
   const navigate = useNavigate()
   const qc = useQueryClient()
   const [message, setMessage] = useState<{ type: "ok" | "error"; text: string } | null>(null)
-  // A deployment edit only persists to castle.yaml; the unit/process still need
+  // A deployment edit only persists to wildpc.yaml; the unit/process still need
   // a deploy (regenerate) + restart to actually take effect.
   const [pendingApply, setPendingApply] = useState(false)
   const [applying, setApplying] = useState(false)
@@ -43,8 +43,8 @@ export function ConfigPanel({ deployment, configSection, onRefetch }: ConfigPane
       setMessage({
         type: "ok",
         text: isDeployment
-          ? "Saved to castle.yaml — not live yet; apply to converge."
-          : "Saved to castle.yaml",
+          ? "Saved to wildpc.yaml — not live yet; apply to converge."
+          : "Saved to wildpc.yaml",
       })
       if (isDeployment) setPendingApply(true)
       onRefetch()
@@ -67,7 +67,7 @@ export function ConfigPanel({ deployment, configSection, onRefetch }: ConfigPane
       qc.invalidateQueries()
       onRefetch()
     } catch (e: unknown) {
-      // A self-apply of castle-api restarts it, killing the connection — expected.
+      // A self-apply of wildpc-api restarts it, killing the connection — expected.
       if (e instanceof TypeError) {
         setPendingApply(false)
         setMessage({ type: "ok", text: "Applied — the service is restarting." })

app/src/components/detail/CreateDeploymentForm.tsx

@@ -26,7 +26,7 @@ const KIND_INFO: Record<DeploymentKind, { label: string; hint: string }> = {
   static: { label: "Static", hint: "Static site served by the gateway" },
 }
 
-/** Create a deployment in castle.yaml, then deploy (and start, for a service).
+/** Create a deployment in wildpc.yaml, then deploy (and start, for a service).
  * A pick-a-kind wizard: the chosen kind sets the manager and shows only its
  * relevant fields. Reachable standalone or prefilled from a program page. */
 export function CreateDeploymentForm({

app/src/components/detail/JobFields.tsx

@@ -93,7 +93,7 @@ export function JobFields({ job, onSave, onDelete }: Props) {
         width="w-48"
         mono
         placeholder="0 2 * * *"
-        hint="Cron expression — castle generates a systemd timer that runs the job on this schedule."
+        hint="Cron expression — wildpc generates a systemd timer that runs the job on this schedule."
       />
       <Field label="Launch" hint="How the job runs on each tick, then exits: the launcher and its target (a console script, command/argv, image, node script, or compose file).">
         <div className="flex items-center gap-2">
@@ -124,7 +124,7 @@ export function JobFields({ job, onSave, onDelete }: Props) {
         onSave={handleSave}
         onDelete={onDelete ? () => onDelete(job.id) : undefined}
         deleteLabel="Remove job"
-        confirmMessage={`Remove job "${job.id}" from castle.yaml? Run a deploy afterward to tear down its timer.`}
+        confirmMessage={`Remove job "${job.id}" from wildpc.yaml? Run a deploy afterward to tear down its timer.`}
       />
     </div>
   )

app/src/components/detail/ProgramFields.tsx

@@ -95,7 +95,7 @@ export function ProgramFields({ program, onSave, onDelete }: Props) {
         onChange={setSource}
         mono
         placeholder="/data/repos/my-prog"
-        hint="The working copy on disk. Castle runs dev verbs and builds here. Absolute path, or repo:<name> for castle's own programs."
+        hint="The working copy on disk. Wild PC runs dev verbs and builds here. Absolute path, or repo:<name> for wildpc's own programs."
       />
       <Field
         label="Stack"
@@ -119,7 +119,7 @@ export function ProgramFields({ program, onSave, onDelete }: Props) {
         onChange={setRepo}
         mono
         placeholder="https://github.com/me/x.git"
-        hint="Git URL so 'castle program clone' can fetch the source on a fresh machine. An existing working copy at Source takes precedence."
+        hint="Git URL so 'wildpc program clone' can fetch the source on a fresh machine. An existing working copy at Source takes precedence."
       />
       <TextField
         label="Ref"
@@ -134,7 +134,7 @@ export function ProgramFields({ program, onSave, onDelete }: Props) {
         value={deps}
         onChange={setDeps}
         placeholder="pandoc, poppler-utils"
-        hint="OS packages the program needs. Listed for reference — castle does not install them."
+        hint="OS packages the program needs. Listed for reference — wildpc does not install them."
       />
 
       <Field

app/src/components/detail/ServiceFields.tsx

@@ -201,7 +201,7 @@ export function ServiceFields({ service, onSave, onDelete }: Props) {
             width="w-32"
             mono
             placeholder="9001"
-            hint="The port the service listens on. Castle health-checks and proxies this port; map it to the program's own var with ${port} in Environment."
+            hint="The port the service listens on. Wild PC health-checks and proxies this port; map it to the program's own var with ${port} in Environment."
           />
           <TextField
             label="Health path"
@@ -210,7 +210,7 @@ export function ServiceFields({ service, onSave, onDelete }: Props) {
             width="w-48"
             mono
             placeholder="/health"
-            hint="HTTP path castle polls to report up/down."
+            hint="HTTP path wildpc polls to report up/down."
           />
           <Field
             label="Reach"
@@ -263,7 +263,7 @@ export function ServiceFields({ service, onSave, onDelete }: Props) {
         onSave={handleSave}
         onDelete={onDelete ? () => onDelete(service.id) : undefined}
         deleteLabel="Remove service"
-        confirmMessage={`Remove service "${service.id}" from castle.yaml? Run a deploy afterward to tear down its unit.`}
+        confirmMessage={`Remove service "${service.id}" from wildpc.yaml? Run a deploy afterward to tear down its unit.`}
       />
     </div>
   )

app/src/components/detail/ToolFields.tsx

@@ -15,7 +15,7 @@ interface Props {
 /** Edit a tool's (path) deployment config. A path deployment has no launcher,
  * port, or schedule — only a description and its `tool_schema` (the neutral
  * tool-call definition handed to agents), plus its manager. It has no run env:
- * a tool is a CLI on PATH, invoked from a shell with castle out of the loop, so
+ * a tool is a CLI on PATH, invoked from a shell with wildpc out of the loop, so
  * `defaults.env` is never applied (deploy.py only wires env for systemd units). */
 export function ToolFields({ tool, onSave, onDelete }: Props) {
   const m = tool.manifest

app/src/components/detail/fields.tsx

@@ -170,7 +170,7 @@ export function useEnvSecrets(initial: Record<string, string>) {
             Use <code className="font-mono">${"{port}"}</code>,{" "}
             <code className="font-mono">${"{data_dir}"}</code>,{" "}
             <code className="font-mono">${"{name}"}</code>,{" "}
-            <code className="font-mono">${"{public_url}"}</code> for castle's computed values,
+            <code className="font-mono">${"{public_url}"}</code> for wildpc's computed values,
             and <code className="font-mono">${"{secret:NAME}"}</code> for secrets.
           </p>
           {Object.entries(env).map(([key, val]) => (