Tell replies their envs and call queued work runs

Chat replies now list the envs that reach them (keys and descriptions,
never values), so a bot no longer asks for keys that are set or "checks"
them with show_secret or printenv. request_secret refuses a key that's
already set unless the user asked to replace it, and search_computers
says envs aren't loaded in its shell.

start_task and delegate_task results say "Run #N" and that list_tasks
doesn't show it, since bots sent users to the to-do list for queue jobs.
start_task refuses a second open run in the session on the same
computer unless it's separate work, and says how many runs are ahead on
that computer.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/bots-queue/compose-envs-note.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, test } from "bun:test";
+import composeEnvsNote from "./compose-envs-note";
+
+describe("composeEnvsNote", () => {
+    test("lists the computer's envs and the tools-only ones apart", () => {
+        const note = composeEnvsNote({
+            on_computer: [{ key: "DB_PASSWORD", description: "Production database" }],
+            tools_only: [{ key: "API_TOKEN", description: "" }],
+            has_computer: true,
+        });
+
+        expect(note).toContain("- DB_PASSWORD: Production database");
+        expect(note).toContain("- API_TOKEN");
+        expect(note).not.toContain("- API_TOKEN:");
+        expect(note.indexOf("DB_PASSWORD")).toBeLessThan(note.indexOf("Only in tools"));
+        expect(note).toContain("Don't ask the user for them");
+    });
+
+    test("never mentions values", () => {
+        const note = composeEnvsNote({ on_computer: [{ key: "K", description: "d" }], tools_only: [], has_computer: true });
+
+        expect(note).not.toContain("Only in tools");
+        expect(note).toContain("you never see values");
+    });
+
+    test("says so when nothing is set", () => {
+        expect(composeEnvsNote({ on_computer: [], tools_only: [], has_computer: false })).toContain("No envs are set");
+    });
+});