feat(desktop): auto-discover Honcho instances on localhost (#1)

* feat(desktop): auto-discover Honcho instances on localhost

First-launch and on-demand discovery of running Honcho instances on
127.0.0.1:8000-8100. Desktop-only — the browser can't port-scan due to
CORS, so the scan runs in the Tauri Rust shell.

- New Rust command `discover_honcho_instances(start_port?, end_port?)`
  in src-tauri/src/discover.rs: parallel TCP probe of each port with
  150ms connect timeout + 250ms total request budget, looking for a
  /health endpoint returning `{"status":"ok"}`.
- New TS helper `discoverHonchoInstances()` in src/lib/discovery.ts:
  detects Tauri runtime; web build degrades to an empty result.
- `suggestNameForInstance()` fetches the first workspace and derives a
  friendly name from its id ("neo-personal" -> "Neo"). Used to seed the
  Name field for each discovered instance.
- `DiscoveredInstances` component: list of found instances with
  editable suggested names + per-row checkbox + "Add N instances"
  button. Rows are pre-checked by default and filter out already-
  configured baseUrls.
- Wired into `InstancesManager`:
  - First launch (no instances): renders above the connection-type
    chooser with autoRun=true. User sees results immediately.
  - With instances: adds a "Discover instances" button to the list
    view that opens the discovery flow on demand.
  - Both paths gate on `isTauri()`; the web build keeps its existing
    behaviour unchanged.

Adds tokio (with net + io-util + time + rt + macros) and futures to
the Tauri shell to get async TCP + join_all.

Tests:
- deriveNameFromWorkspaceId handles hyphenated, multi-segment, and
  no-hyphen ids

* test(desktop): add probe tests including live Hermes stack integration

- rejects_inverted_port_range
- ignores_ports_with_no_listener
- finds_live_hermes_stacks (#[ignore]d; opt-in with --ignored)

The ignored test exercises discover_honcho_instances against ports
8000-8010, expecting exactly [8001, 8002, 8003, 8004, 8005]. Verified
locally — the probe finds all 5 stacks in <10ms.

---------

Co-authored-by: Agents <agents@Jarviss-Mac-mini.local>

packages/desktop/src-tauri/Cargo.lock

@@ -923,6 +923,21 @@ dependencies = [
  "new_debug_unreachable",
 ]
 
+[[package]]
+name = "futures"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b147ee9d1f6d097cef9ce628cd2ee62288d963e16fb287bd9286455b241382d"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
 [[package]]
 name = "futures-channel"
 version = "0.3.32"
@@ -930,6 +945,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "07bbe89c50d7a535e539b8c17bc0b49bdb77747034daa8087407d655f3f7cc1d"
 dependencies = [
  "futures-core",
+ "futures-sink",
 ]
 
 [[package]]
@@ -984,6 +1000,7 @@ version = "0.3.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "389ca41296e6190b48053de0321d02a77f32f8a5d2461dd38762c0593805c6d6"
 dependencies = [
+ "futures-channel",
  "futures-core",
  "futures-io",
  "futures-macro",
@@ -2268,6 +2285,7 @@ dependencies = [
 name = "openconcho"
 version = "0.8.0"
 dependencies = [
+ "futures",
  "serde",
  "serde_json",
  "tauri",
@@ -2275,6 +2293,7 @@ dependencies = [
  "tauri-plugin-deep-link",
  "tauri-plugin-http",
  "tauri-plugin-shell",
+ "tokio",
 ]
 
 [[package]]