v0.7.0 - Pre-flight launch validation (Test button on every model card)

validate.py:
- Builds the same args list a real swap would pass to 'vllm serve'
- SSHes into Spark 1 and runs vLLM's own argparse layer inside the running vllm_node container, WITHOUT initializing the engine
- Uses FlexibleArgumentParser (from vllm.utils.argparse_utils, with fallback to engine.arg_utils) + make_arg_parser — the exact same parser the 'vllm serve' CLI uses. Earlier attempt with bare argparse.ArgumentParser was too strict (rejected '--moe_backend' with underscore that the real CLI accepts via FlexibleArgumentParser's normalization)
- Returns structured {ok, stage, error, cmd_args, launch_cmd} so the UI can surface the exact failure cause

Endpoint: POST /api/swap/{key}/validate. Cheap (~5s), no engine init, no disruption to the currently-loaded model.

Frontend: 'Test' button on every model card, inline result below the action row (green check or red detailed error). Result stays visible until the user reloads or clicks Test again.

Catches: typos in flag names, deprecated/removed flags after a vLLM upgrade, type mismatches. Does NOT catch runtime-only failures (Mamba block-size assertion, OOM at load, kernel-compat). Ok=true is necessary-but-not-sufficient; ok=false is definitive 'don't bother running it'.

package/startos/versions/v0_1_0.ts

@@ -1,10 +1,10 @@
 import { VersionInfo, IMPOSSIBLE } from '@start9labs/start-sdk'
 
 export const v0_1_0 = VersionInfo.of({
-  version: '0.6.0:1',
+  version: '0.7.0:2',
   releaseNotes: {
     en_US:
-      'v0.6: Service-level connectivity tracking and a passive failure-report endpoint. The connectivity log now records up/down transitions for Parakeet, Magpie, and vLLM in addition to the Spark hosts (driven by the existing /api/status and /api/services polling). A new POST /api/health-event endpoint lets external apps (e.g. Open WebUI) record failures they observed even when the failure was brief enough to slip between polls. The Connectivity log dialog shows hosts and services with separate badges, and reports appear inline with their source app + error detail.',
+      'v0.7: pre-flight launch validation. New "Test" button on every model card runs vLLM\'s argparse against the proposed launch command inside the running vllm_node container — without starting an engine. Catches unknown flags, bad types, and version-removed flags in about 5 seconds, before disrupting the currently-loaded model. (Runtime-only failures like the Qwen3.6 Mamba block-size assertion still only surface during a real swap, but argparse-stage bugs are now caught up front.)',
   },
   migrations: {
     up: async ({ effects }) => {},