chore(repo): untrack web/ build output entirely

The `web/` directory holds the SPA Manager Vite build output. Everything
inside it was already gitignored except `web/index.html`, which was kept
tracked so semantic-release tags pointed at a buildable revision.

That kept causing churn: every developer build hashed the asset filenames,
which mutated index.html, which appeared as an unstaged change in every
working tree. CI artifacts can be reproduced from source via
`pnpm build:manager`, so there's no reason to track the entry HTML.

This commit:
  - removes `web/index.html` from the index (file stays on disk for local
    dev; `.gitignore` keeps it ignored from now on)
  - drops the `!web/index.html` exception line from `.gitignore`
  - changes the wildcard `web/*` to `web/` so the rule reads cleanly

web/index.html

@@ -1,16 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <title>Wildcard Pipeline Manager</title>
-    <link rel="icon" type="image/svg+xml" href="/wp/images/favicon.svg" />
-    <link rel="apple-touch-icon" href="/wp/images/apple-touch-icon.png" />
-    <link rel="manifest" href="/wp/images/site.webmanifest" />
-    <script type="module" crossorigin src="/wp/assets/manager-yLWQMHbh.js"></script>
-    <link rel="stylesheet" crossorigin href="/wp/assets/manager-Dgq4_qmM.css">
-  </head>
-  <body>
-    <div id="app"></div>
-  </body>
-</html>