docs(blog): link the English deck PDF from the end of 'The Ontology Is the Software' (#22264)

Fixes #22263
Clause-②: no

One paragraph added at the end of
`content/blog/the-ontology-is-the-software.mdx`, after *Further
reading*: an *As a talk* note linking the English deck, "The Ontology Is
the Software — How a large model reads an enterprise", as a PDF. Nothing
else on the page changes.

## Link form

Absolute, https://objectstack.ai/decks/the-ontology-is-the-software.pdf,
not root-relative. The Check Documentation Links lane runs lychee
`--offline` with `--root-dir` at `content/` (see
`.github/workflows/check-links.yml`), so `/decks/...` would resolve to
`content/decks/...` and fail, while an http(s) link is excluded by
`--offline`. The file is served from `apps/docs/public/decks/` by PR
#22254, ahead of this one in the merge queue.

## Gates (head 8e82126, exit codes captured per command)

`node scripts/pm/dispatch-gates.mjs --commands --repo
objectstack-ai/objectstack
content/blog/the-ontology-is-the-software.mdx` derives 15 commands; all
15 exit 0: check-ci-filter-parity, check-closing-keyword-parity (and
`--self-test`), check-comment-mask-corpus, check-doc-frontmatter (and
`--self-test`), the lint package's check:doc-formula-expressions,
check:cross-package-test-inputs, check:doc-anchors, check:doc-authoring,
check:driver-memory-census, check:gitlink-declared, check:nul-bytes,
check:refd-timer-probe, check:watch-hint-literal. The
formula-expressions gate first exited 3 (PREREQUISITE NOT MET, nothing
measured) in the fresh worktree; it exited 0 after `pnpm --filter
"@objectstack/lint..." build`.

## Checks

- Docs-only: one file under `content/blog/`. No `packages/**`,
`apps/docs/**`, README or generated ledger. Nothing publishes:
`skip-changeset`.
- No model identifier in the diff, the commit or this body.
- Seat-executed under the maintainer's instruction quoted on the card,
and landed through the merge queue on that instruction.

---
🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_011hRnra93sK5Q2gTYYTbdJR

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

Author: objectstack-fleet[bot]

content/blog/the-ontology-is-the-software.mdx

@@ -286,3 +286,7 @@ Design of the Force.com Multitenant Internet Application Development Platform"
 (SIGMOD 2009). In this documentation: [Business Ontology](/docs/concepts/ontology),
 [How AI Development Works](/docs/getting-started/how-ai-development-works),
 [Connect an MCP Client](/docs/ai/connect-mcp).
+
+*As a talk.* The same argument as a seventeen-slide deck, "The Ontology Is the
+Software — How a large model reads an enterprise":
+[download the PDF](https://objectstack.ai/decks/the-ontology-is-the-software.pdf).