diff --git a/docs/navigation-audit.md b/docs/navigation-audit.md
index 9720dd82..f68f1b3f 100644
--- a/docs/navigation-audit.md
+++ b/docs/navigation-audit.md
@@ -37,14 +37,14 @@ That fix is the template for the HIGH items below. **Caveat:** the fix only did
 
 **Existing entity routes:** `/chat/:sessionId`, `/jobs/:id`, `/dashboards/:id`, `/email/:emailId`,
 `/browser/:tabId`, `/tasks/:dirName`, `/skills/:dirName`, `/processes/:dirName`, `/task-logs/:id`,
-`/activity/:id`. (`/projects/:id`
+`/activity/:id`, `/plans/:name`. (`/projects/:id`
 was in this list; the Projects feature was removed end to end on 2026-07-30, so the route is gone with it. H3
 and navigate-site 22 below still name it — they are the record of work that happened, not of code that exists.)
 **Section routes** (a param that names a view rather than an entity): `/settings/:page/:section`,
 `/soulseek/:section`, `/headscale/:section`, `/wallet/:section`, `/system-monitor/:scope`.
 **Query-param screens:** `/music?path=`, `/files?path=`, `/code-editor?file=`.
-**Genuinely flat, still:** `/` `/plans` `/terminal` `/desktop` `/qr-transfer`. Of these only `/plans` selects
-something (M9); the other four have nothing addressable to put in an address.
+**Genuinely flat, and correctly so:** `/` `/terminal` `/desktop` `/qr-transfer` — none of them selects
+anything, so there is nothing to put in an address.
 The five settings pages are route **pairs** now, not flat screens — `/settings/{profile,ai,system,integrations,user-management}`
 plus a `:section` each (M6). There has never been a `/settings/apps`; that entry was wrong when this list
 was written.
@@ -85,7 +85,7 @@ are good building blocks. The **Workspace/Panel framework** contains **zero** ro
 | ~~M6~~ | `Settings/SettingsPanel.tsx` | a settings sub-section | `/settings/:page/:section` | **Done.** `<NavLink>` + `useParams`, five `*_SELECTED` globals gone, one `SettingsRoute` guard per page. The "one change covers all settings pages" claim was *almost* right: Integrations builds its own sidebar and did not go through `createSettingsPanelComponents`, and it also held the Enterprise/Personal tab in a second global — derived from the section key now, which is what fixes deep-linking a Personal section. |
 | ~~M7~~ | ~~`workspaces/components/Combobox.tsx:53`~~ | caller-supplied route | — | **Deleted, not fixed.** "Every caller inherits the opaque click" was the reason this ranked MEDIUM, and it is wrong: `Combobox` has **no callers**. Nothing has imported it since the initial commit, there is no barrel export, and nothing anywhere sets `href` on a `SelectOption` — so the navigate, the separator that only showed for `href` options, and the `href` field on both declarations of the type were all unreachable. Writing anchor semantics into a component that is never rendered is building, not fixing. Its `Command` primitives stay; `AIHarnessesSection` uses them. |
 | ~~M8~~ | `Layout/Header/UserMenu.tsx` | — | — | **Done.** Removed rather than routed: nothing had ever been built behind `/settings/resources`, so the item was a bounce to `/` dressed as navigation. Its `header.userMenu.resources` locale keys went with it. |
-| M9 | `Screens/Dashboard/Plans/index.tsx:36` | a plan document | `/plans/:name` | native `<select>` → local state; a plan is a real addressable doc. Have the select `navigate()` or use a link list. |
+| ~~M9~~ | `Screens/Dashboard/Plans/index.tsx` | a plan document | `/plans/:name` | **Done.** Route pair, no `Navigate` guard — the bare route means "no plan open", which is a real state, so the auto-select-first effect was deleted rather than turned into a redirect. The `<select>` navigates instead of setting state; it stays a `<select>` on purpose (chrome for one document, not a master list) and therefore genuinely has no cmd-click — a native `<option>` cannot be an anchor. A name that no longer exists gets the empty pane, not a rewritten URL. Reading the server route for this also turned up a **path traversal**: hono percent-decodes route params, so `GET /api/plans/..%2F..%2Fsecret` reached `join(plansDir, '../../secret.md')`. Now `basename()`d. |
 | ~~M10~~ | `SystemMonitor/ScopeList.tsx` | monitor scope (btop/pm2/docker) | `/system-monitor/:scope` | **Done.** Route pair + `Navigate` guard; the scope buttons are `NavLink`s and `useMonitorScope` reads `useParams` instead of the channel. The Dock's hand-rolled `isActive` is a `startsWith`, so its highlight survives the redirect. |
 
 **Music** (M-music) and **Soulseek** (M-slsk) are whole-workspace channel apps — pulled out below because each
@@ -225,7 +225,7 @@ publishers means changing the chat panel, which is another agent's, so it is wri
 - [x] **Music** — `/music?path=<rel>`; `music:cwd` deleted; every drill-in (including the dock's now-playing tile, navigate-site 13) is a `<Link>`. `music:favorites` and `music:resync` stay — a view toggle and a refresh signal. **Needs runtime test.**
 - [x] **Soulseek** — `/soulseek/:section` with the peer in `?user=` and the search already in `?search=`; the two selection channels are deleted. Rooms and conversations are still `useState`. **Needs runtime test.**
 - [x] **M10** SystemMonitor scope → `/system-monitor/:scope`; `monitor:scope` channel deleted. **Needs runtime test.**
-- [ ] **M9** Plans → `/plans/:name` (`Plans/index.tsx:36`).
+- [x] **M9** Plans → `/plans/:name`; the auto-select-first effect is gone (the bare route is a real state: no plan open), and the `<select>` navigates instead of setting state. It stays a `<select>` — a native `<option>` cannot be an anchor, so this one has no cmd-click and the doc should not pretend otherwise; it is chrome for a single document, not a master list. Reading the route also turned up a path traversal in `GET /api/plans/:name` (hono percent-decodes params, so `..%2F..%2Fx` walked out of `plansDir`) — fixed with `basename()`. **Needs runtime test.**
 
 ### Phase 4 — Polish + borderline decisions
 - [ ] Dock + Header + mobile sheet → react-router `<NavLink>` for active state; drop hand-rolled `isActive` (`Dock.tsx`, `Header.tsx`).
diff --git a/src/apps/officer-web/App.tsx b/src/apps/officer-web/App.tsx
index 22aca748..85fe9a6d 100644
--- a/src/apps/officer-web/App.tsx
+++ b/src/apps/officer-web/App.tsx
@@ -54,6 +54,7 @@ export function App() {
             <Route path="/chat/g/*" element={<Dashboard.SessionListPage />} />
             <Route path="/chat/:sessionId" element={<Dashboard.SessionListPage />} />
             <Route path="/plans" element={<Dashboard.Plans />} />
+            <Route path="/plans/:name" element={<Dashboard.Plans />} />
             <Route path="/files" element={<Dashboard.FilesScreen />} />
             <Route path="/calendar" element={<Dashboard.CalendarScreen />} />
             <Route path="/contacts" element={<Dashboard.ContactsScreen />} />
diff --git a/src/apps/officer-web/Screens/Dashboard/Plans/index.tsx b/src/apps/officer-web/Screens/Dashboard/Plans/index.tsx
index 3e19020f..cf0d2fc2 100644
--- a/src/apps/officer-web/Screens/Dashboard/Plans/index.tsx
+++ b/src/apps/officer-web/Screens/Dashboard/Plans/index.tsx
@@ -1,61 +1,71 @@
-import { useState, useEffect } from 'react';
 import { useQuery } from '@tanstack/react-query';
+import { useNavigate, useParams } from 'react-router';
 import ReactMarkdown from 'react-markdown';
 import remarkGfm from 'remark-gfm';
 import rehypeRaw from 'rehype-raw';
 import { useClient } from 'hooks/useClient';
 import { Card } from '@/components/Card';
+
+/**
+ * A plan is a markdown document on disk, so it gets an address: `/plans/:name`. No redirect guard — the
+ * bare route is "no plan open" and a name that no longer exists gets the empty pane, not a rewritten URL.
+ *
+ * The picker stays a native `<select>` rather than becoming a link list. It is chrome for one document,
+ * not a master list, and a `<select>` is the right control for that on a phone; it navigates instead of
+ * setting state, which is what M4 was actually about.
+ */
 export const Plans = () => {
   const client = useClient();
-  const [selectedPlan, setSelectedPlan] = useState<string | null>(null);
+  const navigate = useNavigate();
+  const selected = useParams<{ name: string }>().name ?? null;
 
   const { data: plans = [] } = useQuery<string[]>({
     queryKey: ['plans'],
     queryFn: () => client.get<string[]>('/plans'),
   });
 
-  useEffect(() => {
-    if (plans.length > 0 && !selectedPlan) {
-      setSelectedPlan(plans[0]!);
-    }
-  }, [plans, selectedPlan]);
-
   const { data: content = '' } = useQuery<string>({
-    queryKey: ['plans', selectedPlan],
-    queryFn: () => client.getText(`/plans/${selectedPlan}`),
-    enabled: !!selectedPlan,
+    queryKey: ['plans', selected],
+    queryFn: () => client.getText(`/plans/${encodeURIComponent(selected!)}`),
+    enabled: !!selected,
   });
 
   return (
     <div className="flex flex-col h-full p-4">
-        <Card className="flex-1 overflow-hidden">
-          {/* Header with plan selector */}
-          <div className="shrink-0 flex items-center gap-3 px-4 py-2 border-b border-duck-dark/10 bg-background/60">
-            <span className="text-sm font-medium text-duck-dark/70">Plans</span>
-            {plans.length > 1 && (
-              <select
-                value={selectedPlan ?? ''}
-                onChange={(ev) => setSelectedPlan(ev.target.value)}
-                className="text-xs border border-duck-dark/20 rounded px-2 py-1 bg-background/80 text-duck-dark"
-              >
-                {plans.map((p) => (
-                  <option key={p} value={p}>
-                    {p}
-                  </option>
-                ))}
-              </select>
-            )}
-          </div>
+      <Card className="flex-1 overflow-hidden">
+        <div className="shrink-0 flex items-center gap-3 px-4 py-2 border-b border-duck-dark/10 bg-background/60">
+          <span className="text-sm font-medium text-duck-dark/70">Plans</span>
+          {plans.length > 0 && (
+            <select
+              value={selected ?? ''}
+              onChange={(ev) => navigate(`/plans/${encodeURIComponent(ev.target.value)}`)}
+              className="text-xs border border-duck-dark/20 rounded px-2 py-1 bg-background/80 text-duck-dark"
+            >
+              {/* Only while nothing is chosen: it disappears once you pick, so it can never be picked back. */}
+              {!selected && <option value="">Select a plan…</option>}
+              {plans.map((p) => (
+                <option key={p} value={p}>
+                  {p}
+                </option>
+              ))}
+            </select>
+          )}
+        </div>
 
-          {/* Markdown content */}
-          <div className="overflow-y-auto h-full p-6">
+        <div className="overflow-y-auto h-full p-6">
+          {selected ? (
             <div className="prose prose-sm dark:prose-invert max-w-none prose-headings:text-duck-dark prose-a:text-duck-teal prose-pre:bg-gray-900 prose-pre:text-green-400 prose-code:text-duck-teal prose-code:before:content-none prose-code:after:content-none prose-td:text-sm prose-th:text-sm">
               <ReactMarkdown remarkPlugins={[remarkGfm]} rehypePlugins={[rehypeRaw]}>
                 {content}
               </ReactMarkdown>
             </div>
-          </div>
-        </Card>
+          ) : (
+            <p className="text-sm text-duck-dark/50">
+              {plans.length === 0 ? 'No plans yet.' : 'Pick a plan to read it.'}
+            </p>
+          )}
+        </div>
+      </Card>
     </div>
   );
 };
diff --git a/src/servers/api/plans/plans.ts b/src/servers/api/plans/plans.ts
index 16f3b178..0200068b 100644
--- a/src/servers/api/plans/plans.ts
+++ b/src/servers/api/plans/plans.ts
@@ -1,6 +1,6 @@
 import { createRouter } from '../../create-router';
 import { readdir } from 'node:fs/promises';
-import { join } from 'node:path';
+import { basename, join } from 'node:path';
 
 const plansDir = join(process.cwd(), 'plans');
 
@@ -17,7 +17,11 @@ plansRouter.get('/', async (ctx) => {
 });
 
 plansRouter.get('/:name', async (ctx) => {
-  const name = ctx.req.param('name');
+  // A single path segment is not a single *name*: hono percent-decodes params, so `..%2F..%2Fsecret`
+  // arrives here as `../../secret` and `join` would happily walk out of plansDir. Verified against hono
+  // directly. Auth limits the blast radius to the owner's own token, and the `.md` suffix limits it to
+  // markdown, but "read any .md on the disk" is not what this endpoint is for.
+  const name = basename(ctx.req.param('name'));
   const filePath = join(plansDir, `${name}.md`);
   const file = Bun.file(filePath);
   if (!(await file.exists())) return ctx.text('Not found', 404);