chore(agents): update skill metadata timestamps, source URLs, and documentation wording across dot_agents files

dot_agents/skills/write-tests/SKILL.md

@@ -40,7 +40,7 @@ import { describe, it } from 'node:test'
 Remix test package script:
 
 ```json
-"test": "remix-test"
+"test": "remix test"
 ```
 
 Remix test imports:
@@ -64,6 +64,8 @@ import { describe, it } from '@remix-run/test'
 - Avoid importing higher-level workspace packages just to build a fixture. For example, a fetch-handler test can branch on `new URL(request.url).pathname` instead of depending on `@remix-run/fetch-router`.
 - Prefer Web APIs and standards-aligned primitives when they express the fixture clearly.
 - For e2e tests, serve the smallest app or handler that exercises the user-observable behavior under test.
+- For HMR tests, use real file changes, child processes, watchers, and browser assertions when the public behavior depends on runtime coordination.
+- Close spawned processes, asset servers, watchers, and HTTP servers in test cleanup.
 
 ## Assertions