Advertise the ssh provider on the marketing page

The marketing-drift contract failed the build because `ssh` shipped in the
provider registry with no entry in MARKETING_PROOF -- which is the test
working: it exists so a provider cannot ship while the pages people
actually land on still describe the tool without it.

The proof regex is `/~\/\.ssh|SSH key/` rather than a bare `/SSH/` on
purpose. The provider grid renders every registry `name`, and this one is
"Local SSH directory", so `/SSH/` would already be satisfied by the
generated grid and the provider could ship with no copy written about it
at all -- passing the test while failing its intent. Requiring the path or
the phrase means a human wrote a sentence.

That sentence is the new block in the credential-sharing band: ~/.ssh is a
directory of files whose permission bits are load-bearing, not a set of
KEY=VALUE lines, which is the part that makes this provider different from
the other six. README already named ~/.ssh keys, so it needed no change.

apps/logicsrc-web: 75/75 contract tests pass (was 74 passed, 1 failed).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/logicsrc-web/contract/marketing-drift.contract.test.ts

@@ -27,7 +27,13 @@ const MARKETING_PROOF: Record<string, RegExp> = {
   railway: /Railway/,
   "github-secrets": /GitHub Secrets/,
   sh1pt: /sh1pt/,
-  team: /[Tt]eam vault/
+  team: /[Tt]eam vault/,
+  // Deliberately not a bare /SSH/. The provider grid renders every registry
+  // `name`, and this one is "Local SSH directory" -- so /SSH/ would be
+  // satisfied by the grid alone and this provider could ship with no copy
+  // written about it at all, which is the drift these tests exist to catch.
+  // Requiring the path or the phrase means a human wrote a sentence.
+  ssh: /~\/\.ssh|SSH key/
 };
 
 const REPO_ROOT = resolve(process.cwd(), "../..");

apps/logicsrc-web/src/lib/page-markup.ts

@@ -309,6 +309,12 @@ logicsrc teams invite acme teammate@example.com  # emails an accept link
 logicsrc teams grant acme web prod teammate@example.com
 logicsrc teams pull acme web prod --env .env     # download + decrypt
 logicsrc credentials rotate acme web prod --approve</code></pre>
+            <h3>SSH keys, not just environment variables</h3>
+            <p>Not every secret is a <code>KEY=VALUE</code> line. <code>~/.ssh</code> is a directory of files whose permission bits are load-bearing &mdash; a private key restored world-readable is one OpenSSH will refuse to use. The ssh provider moves that directory through the same end-to-end-encrypted vault as everything else and puts each file back with its mode intact, so a new machine is set up rather than merely populated. Restored SSH keys can go straight into <code>ssh-agent</code> instead of onto disk.</p>
+            <pre><code>logicsrc secrets ssh push profullstack   # back up ~/.ssh to vault ssh--&lt;you&gt;
+logicsrc secrets ssh list profullstack   # what the vault holds: paths, kinds, modes
+logicsrc secrets ssh pull profullstack   # restore on another machine, permissions and all
+logicsrc secrets ssh agent profullstack  # load into ssh-agent, never onto disk</code></pre>
           </article>
           <div class="soon-grid">
             ${credentialProviders.map((item) => `