Docs: Add NVIDIA GTC 2026 blog skeletons and OpenSpec documentation

[NickJLange]

This PR adds the skeletons for the 11-part NVIDIA GTC 2026 blog series and the associated OpenSpec change documentation.

---

Summary by cubic

Adds skeletons for an 11-part NVIDIA GTC 2026 blog series with consistent metadata and placeholders, plus OpenSpec docs that define the series. Updates latest-post.json to the Vertical AI post.

• New Features
  • Blog series: 11 posts (intro + 10 themes: sovereign clouds, robotics, cooling, Blackwell/networking, NIMs, enterprise, edge, telco, security, vertical AI) with consistent frontmatter, <!-- truncate -->, and TODOs referencing mkai/gtc2026.
  • OpenSpec: spec-driven docs under openspec/changes/nvdia-gtc-series/ (.openspec.yaml, design, proposal, spec, tasks) outlining requirements and scope.
  • Content feed: src/generated/latest-post.json now points to the Vertical AI post.

^{Written for commit aaf12e4. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 19 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="openspec/changes/nvdia-gtc-series/tasks.md">

<violation number="1" location="openspec/changes/nvdia-gtc-series/tasks.md:1">
P3: The change directory name appears misspelled (`nvdia` vs `nvidia`), which can make this spec harder to find and maintain.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P3: The change directory name appears misspelled (nvdia vs nvidia), which can make this spec harder to find and maintain.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At openspec/changes/nvdia-gtc-series/tasks.md, line 1:

<comment>The change directory name appears misspelled (`nvdia` vs `nvidia`), which can make this spec harder to find and maintain.</comment>

<file context>
@@ -0,0 +1,24 @@
+## 1. Intro Post Creation
+
+- [x] 1.1 Create `blog-applied-ai-engineering/2026-03-22-nvidia-gtc-2026-intro.md`
</file context>