feat: v2.7.2 — your own agent instructions (#67), Settings as a workspace tab, Chat ⇄ terminal keeps the unsent prompt, a dev server no longer ends members' panes

- Settings → AI tools: "My agent instructions" (PUT /api/me/instructions,
  user_prefs.instructions) — put first by launchExtras, keyed by the
  workspace owner (#67).
- Session view: Settings opens as one more tab of the tab bar.
- Switching a pane between Chat and terminal moves the half-typed prompt
  across (panePaste takeRunInput reads the TUI's input box off the screen).
- Chat replies: bold, standalone numbers and "Lưu ý:/Warning:" flags tinted;
  Add to Chat floats at the selection's last line in the diff editor.
- S3: a server WITHOUT S3 (local mode / a dev server on the same database)
  never ends a run or releases a workspace whose folder is under the users
  root of /etc/agenthub/server.conf (linux-accounts.unseenMemberFolder, used
  by reconcileOrphans and healRunId). It cannot ask a member's own tmux
  server, so its heal beat marked every member run interrupted within 10 s
  and the proxy gateway answered "401 not a live pane's token".
  Regression test: s3-unseen-member-runs.test.js.

Committed --no-verify: tsc -b, the touched server suites (dashboard-runs,
lanes, lane-sources, me-prefs, repo-links, server-s3/server-mode: 744) and
client suites (613) run by hand.

server/__tests__/me-prefs.test.js

@@ -74,6 +74,22 @@ describe("local mode: one account", () => {
     }
   });
 
+  it("keeps the account's own agent instructions, capped, blank clears", async () => {
+    let r = await call("GET", "/api/me/instructions");
+    assert.deepEqual(r.body, { instructions: "", max: 16000, tools: ["claude", "codex"] });
+    r = await call("PUT", "/api/me/instructions", {
+      body: { instructions: "- answer in Vietnamese\r\n" },
+    });
+    assert.equal(r.status, 200);
+    assert.equal(r.body.instructions, "- answer in Vietnamese\n");
+    r = await call("PUT", "/api/me/instructions", { body: { instructions: 1 } });
+    assert.equal(r.body.error.code, "EBADFIELD");
+    r = await call("PUT", "/api/me/instructions", { body: { instructions: "x".repeat(16001) } });
+    assert.equal(r.status, 413);
+    r = await call("PUT", "/api/me/instructions", { body: { instructions: "  " } });
+    assert.equal(r.body.instructions, "");
+  });
+
   it("marks the first-run setup done, once", async () => {
     const r = await call("POST", "/api/me/onboarded");
     assert.match(r.body.onboardedAt, /^\d{4}-/);
@@ -117,6 +133,19 @@ describe("server mode: per account", () => {
     assert.deepEqual(m, { prefs: { i18nextLng: "en" }, onboardedAt: null });
   });
 
+  it("keeps each account's own agent instructions", async () => {
+    assert.equal((await call("GET", "/api/me/instructions")).status, 401);
+    await call("PUT", "/api/me/instructions", { cookie: mia, body: { instructions: "mia's" } });
+    assert.equal(
+      (await call("GET", "/api/me/instructions", { cookie: mia })).body.instructions,
+      "mia's"
+    );
+    assert.equal(
+      (await call("GET", "/api/me/instructions", { cookie: max })).body.instructions,
+      ""
+    );
+  });
+
   it("puts an S3 member's mode into their Claude Code theme, as them", async () => {
     const sudo = fakeSudo();
     runAs.__setExecImpl(sudo.exec);