docs: the os validate sample transcript reproduces the run it claims to (#9034) (#9093)

The clean-run sample under "The one gate, four doors" is a reproduction of
what `os validate` prints, not an authorial assertion, so the fix is to make
it faithful rather than to elide the number.

`packages/cli/src/commands/validate.ts:117` prints the count from the
registry itself:

    printStep(`Running author-time rules (${registered.length})...`)
    // registered = authoringRulesFor('validate')

Measured on this tree: `authoringRulesFor('validate').length` is 41, and a
real run of the command prints `Running author-time rules (41)...`. The
sample said 38 — which is today's `os lint` count, not validate's.

Also restores the blank line the same code path prints unconditionally
between the manifest line and the metadata stats (validate.ts:293-298), so
the whole block matches a real run line for line.

No hard count is introduced in prose: #9033 deliberately removed those in
favour of each rule's own `runtimeTypes`, and the only other number on the
page stays the historical "23 of 26" audit statement.

Co-authored-by: Claude <noreply@anthropic.com>

Author: os-project-manager

content/docs/deployment/validating-metadata.mdx

@@ -531,13 +531,14 @@ A clean run walks the registry and reports timing:
   Config: /path/to/support-desk/objectstack.config.ts
   Load time: 21ms
   → Validating against ObjectStack Protocol...
-  → Running author-time rules (38)...
+  → Running author-time rules (41)...
   → Checking capability providers (#3366)...
   → Checking package docs (ADR-0046)...
 
   ✓ Validation passed (64ms)
 
   Support Desk v0.1.0
+
   Data: 1 Objects  6 Fields
   UI: 1 Apps  1 Views  1 Actions
 ```