docs(blog): rename the ~16k measurement's host noun in context-window-is-the-constraint (#9422)

The 2026-07-17 post is a fourth host of the ~16k-token app-crm measurement
that #9293 already renamed on three other surfaces (README, two docs pages).
It called the measured app "the entire business system", which collides with
the adopted "complete CRM in under 150k tokens" tagline (#9242) — two claims
both claiming to be the whole business system at different sizes.

Per the other three hosts' post-#9293 wording, rename only the host noun in
the sentence immediately following the table ("entire business system" ->
"whole example app"), matching the canonical phrasing now used everywhere
else. Numbers (31 / 1,792 / ~16,000 / 8% / 200k) and the surrounding argument
are untouched -- this is a dated blog post, not a living doc, so only the
characterisation collision is in scope.

Fixes #9305

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

Author: os-steve

content/blog/context-window-is-the-constraint.mdx

@@ -42,7 +42,7 @@ a dashboard, a lead-conversion flow, permission sets, an action, translations.
 | Lines | 1,792 |
 | Approximate tokens | ~16,000 |
 
-That's the **entire business system**. Not a module of it — the data model, the
+That's the **whole example app**. Not a module of it — the data model, the
 UI, the automation, the access rules, all of it. It fits in about 8% of a
 200k-token context window.