blog-post: let a post say who wrote it, in a form a machine can read

A post already carries the byline in prose -- "by Anthony 'chovy' Ettinger" --
which is exactly the form nothing can act on. Directories, feed readers and
the fediverse all look for `rel="me"`, and the template published none, so a
crawler could tell you the post existed and nothing about who to reach about
it.

Concretely: rssamplifier indexed this blog, found the author's name from the
feed's managingEditor tag, and shipped an author page carrying an email and a
GitHub link and nothing else -- because the pages genuinely declared nothing
else. The only outbound links on the whole blog were two to kagi.com.

`rel="me"` is the strongest evidence an identity extractor has, ranking above
h-card, JSON-LD `sameAs` and ordinary footer links, because it is the one a
publisher has to state deliberately. Verified against rssamplifier's own
`identityFromHtml`: all three links come back as `source: "rel-me"`.

Personal accounts only. The company's X and YouTube accounts are deliberately
absent -- a directory that files an org account under a person is wrong in a
way that is worse than finding nothing, and the good extractors reject them
anyway.

Kept inside `<article>` and smolweb-valid: one `<p>`, closed, no new elements.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: ralyodio

src/blog.ts

@@ -140,6 +140,10 @@ ${content}
 	<a href="../blog">back to my blog postings</a>
 </nav>
 
+<p>Find me: <a rel="me" href="https://defcon.social/@chovy">Mastodon</a> &middot;
+<a rel="me" href="https://github.com/ralyodio">GitHub</a> &middot;
+<a rel="me" href="mailto:anthony@profullstack.com">email</a></p>
+
 </article>
 
 </body>