diff --git a/packages/mosaic/src/commands/fleet-roster-v2-dispatch.spec.ts b/packages/mosaic/src/commands/fleet-roster-v2-dispatch.spec.ts
index 12d039a0..2d073ec4 100644
--- a/packages/mosaic/src/commands/fleet-roster-v2-dispatch.spec.ts
+++ b/packages/mosaic/src/commands/fleet-roster-v2-dispatch.spec.ts
@@ -211,12 +211,23 @@ describe('mosaic fleet install — roster v2', (): void => {
 describe('mosaic-agent@.service', (): void => {
   const unitPath = resolve(process.cwd(), 'framework', 'systemd', 'user', 'mosaic-agent@.service');
 
-  /** The single `ConditionPathExists=` value declared by the unit template. */
-  async function conditionPath(): Promise<string> {
+  /**
+   * Every `ConditionPathExists=` value declared by the unit template, in file
+   * order, `|` triggering prefix included.
+   *
+   * Until #1410 this helper pinned `toHaveLength(1)` — a count assertion, not
+   * a content assertion, and the count pin was itself the defect: when #1408
+   * required a second triggering line (the `%h/.mosaic` brain-home shape),
+   * this spec was a second consumer of the unit template that the shell suite
+   * and the enumeration guard could not see, so the fix failed here first
+   * (CI 2651 — the installation-documentation.spec.ts lesson again). Assert
+   * content per line, never count.
+   */
+  async function conditionPaths(): Promise<string[]> {
     const unit = await readFile(unitPath, 'utf8');
     const matches = unit.match(/^ConditionPathExists=(.+)$/gm) ?? [];
-    expect(matches).toHaveLength(1);
-    return matches[0]!.slice('ConditionPathExists='.length).trim();
+    expect(matches.length).toBeGreaterThan(0);
+    return matches.map((line) => line.slice('ConditionPathExists='.length).trim());
   }
 
   it('will not attempt a seat before the reconciler has written its env', async (): Promise<void> => {
@@ -224,7 +235,26 @@ describe('mosaic-agent@.service', (): void => {
     // unit (WantedBy=default.target) but does not start it, so without this
     // condition a reboot between `install` and the first `apply` would run
     // ExecStart against an absent env file and fail every seat unit.
-    expect(await conditionPath()).toBe('%h/.config/mosaic/fleet/agents/%i.env.generated');
+    //
+    // Two lines since #1408: the env projection lives under %h/.config/mosaic
+    // on framework-home hosts and under %h/.mosaic on brain-home hosts. Both
+    // carry the `|` triggering prefix — systemd ANDs same-type conditions
+    // unless every line is triggering (then they OR), and a bare spelling
+    // would demand BOTH home shapes on one host, which is never true, so
+    // every seat would silently skip.
+    expect(await conditionPaths()).toEqual([
+      '|%h/.config/mosaic/fleet/agents/%i.env.generated',
+      '|%h/.mosaic/fleet/agents/%i.env.generated',
+    ]);
+  });
+
+  it('refuses the bare ANDed spelling on every condition line', async (): Promise<void> => {
+    // Invariant ported from test-fleet-units.sh, held separately from the
+    // literal pin above so it survives future edits to the path set: every
+    // ConditionPathExists line must stay triggering (`|`).
+    for (const value of await conditionPaths()) {
+      expect(value.startsWith('|')).toBe(true);
+    }
   });
 
   /**
@@ -246,10 +276,18 @@ describe('mosaic-agent@.service', (): void => {
    */
   it('guards exactly the file the fleet writes, so the two cannot drift apart', async (): Promise<void> => {
     const mosaicHome = await v2Home();
-    const rendered = (await conditionPath()).replace('%h', tempHome!).replace('%i', 'coder0');
+    const rendered = (await conditionPaths()).map((value) =>
+      value.replace(/^\|/, '').replace('%h', tempHome!).replace('%i', 'coder0'),
+    );
 
-    // The path an installed fleet actually places for this agent.
-    expect(rendered).toBe(join(mosaicHome, 'fleet', 'agents', 'coder0.env.generated'));
+    // Per home shape, the guard must render to exactly the file the
+    // reconciler writes there: mosaicHome (%h/.config/mosaic) on
+    // framework-home hosts, %h/.mosaic on brain-home hosts (#1408) — each
+    // line pinned to its file, not merely present.
+    expect(rendered).toEqual([
+      join(mosaicHome, 'fleet', 'agents', 'coder0.env.generated'),
+      join(tempHome!, '.mosaic', 'fleet', 'agents', 'coder0.env.generated'),
+    ]);
   });
 
   it('guards a real failure — the launcher rejects an absent generated env', async (): Promise<void> => {