WIP: docs: refresh after iOS + web support (#50)

* docs: README covers iOS + web, surface both example apps

* docs(cli): document --ios-device and per-platform doctor

* docs: tighten README, fold examples into Docs list

* docs(runs): correct --clear-data lifecycle wording

Default behavior no longer wipes app data between runs; --clear-data is now opt-in.

* docs(getting-started): add iOS path, separate folio and folio-web

Document just test-ios under examples/folio, and distinguish the KMP
sample from the React + Vite folio-web sample.

* docs(inspect): document the eight panels

Lists Screenshot, ActionList, Timeline, ViolationsPanel, HierarchyPanel,
SnapshotTable, MetricsChart, ExceptionsPanel. Cross-links HierarchyPanel
to the spec language reference.

* docs(writing-specs): document setup export, flag noLogcatErrors as android-only

Mirrors pkg/spec/README.md so the manual covers the runner's setup-first
fall-through. Marks noLogcatErrors as Android-only so iOS/web spec
authors know it silently no-ops.

* docs(folio): document web target and iOS sanderling test recipe

After the KMP refactor folio also runs on wasmJs and the justfile exposes
just web, just web-build, and just test-ios. Surface all three.

* docs(folio-web): add README

Covers prerequisites, demo credentials, just test recipe, and how the
React + Vite host exposes state to the sanderling spec via stable ids
and data-* attributes.

* docs: scrub driver-implementation name from user docs

Drop the implementation tool name from README, cli.md doctor table, and
spec-language.md. These docs should describe behaviour, not the specific
underlying tool the native sidecar wraps.

* docs(development): scrub driver-implementation name from dev docs

architecture, design-principles, decisions now describe the native
sidecar by role (gRPC surface over OS UI-test pipeline) rather than by
the specific tool it wraps.

docs/manual/cli.md

@@ -19,6 +19,7 @@ Run a spec against an app for a fixed duration.
 | `--launcher-activity` | resolved | Optional `<pkg>/<activity>` to launch. Overrides default resolution. |
 | `--platform` | `android` | Target platform: `android`, `ios`, or `web`. |
 | `--avd` | optional (android) | Android AVD name to boot if no device is connected. Required only when no device is connected and multiple AVDs exist. |
+| `--ios-device` | optional (ios) | iOS simulator name or UDID to boot if none is running. |
 | `--duration` | `5m` | Total test duration (`30s`, `5m`, `2h`, `1d`). |
 | `--seed` | `0` | PRNG seed. `0` uses a random seed and records it in `meta.json`. |
 | `--output` | `./runs` | Output directory for traces. |
@@ -38,7 +39,19 @@ See [the inspect UI page](./inspect/) for the panel reference and keyboard short
 
 ## `sanderling doctor`
 
-Check the host environment for a working sanderling setup: Go toolchain, JDK, Maestro availability, emulator reachability, SDK linkage hints.
+Check the host environment for a working sanderling setup.
+
+```
+sanderling doctor [--platform web|android|ios|all]
+```
+
+`--platform` defaults to `all`, which runs every platform's checks (deduped). Pass a specific platform to scope the output.
+
+| Platform | Checks |
+|---|---|
+| `web` | headless Chromium can launch (the bundled CDP surface boots a real browser). |
+| `android` | `adb` on PATH; `emulator` on PATH or under `ANDROID_HOME`; Java 17+; embedded native sidecar JAR is real. |
+| `ios` | `xcrun` on PATH; `simctl` on PATH; Java 17+; embedded native sidecar JAR is real. |
 
 ## `sanderling version`