docs: add Infrahub Marketplace page

[yjouffrault]

Summary

• Supersedes docs: add Infrahub Marketplace documentation #9093 — original content by Alex Gao, adapted for the revamped docs structure
• New schema/marketplace/index.mdx: single-page merge of the original topic + how-to guide. Covers what the Marketplace is, namespace/name identifiers, semantic versioning, and the full fetch+load workflow (infrahubctl marketplace get → infrahubctl schema load) including version pinning, --stdout, and collection variants
• Sidebar: Marketplace added under Schema & Data → Schema operations
• Replaced all github.com/opsmill/schema-library references with Marketplace links: overview/concepts, overview/quickstart, overview/next-steps, schema/extensions, tutorials/getting-started/schema
• Added "Load a schema" section + Marketplace tip to community and enterprise install pages (the original guides/installation.mdx has since moved to these two files)
• Added stderr/stdin/stdout to Vale spelling exceptions
• Added redirects-pending/marketplace.yml for URL tracking (will be aggregated at cleanup)

Why a new PR instead of merging #9093

PR #9093 was created before the docs revamp shipped. It adds content to topics/ and guides/ paths that no longer exist, and uses the old sidebar structure. This PR applies the same content to the correct new locations.

Test plan

• Build passes: cd docs && npm run build
• Lint passes: uv run invoke docs.lint
• Browse to /schema/marketplace/ — page renders with concept intro and full workflow
• Confirm Marketplace links work in quickstart, concepts, next-steps, schema extensions, getting-started tutorial
• Confirm install pages (community + enterprise) show the "Load a schema" Marketplace tip

🤖 Generated with Claude Code

[cubic-dev-ai]

1 issue found across 12 files

Confidence score: 4/5

• This PR looks safe to merge overall, with only a minor documentation consistency risk rather than a runtime/code regression risk.
• In docs/docs/overview/quickstart.mdx, dropping the uv run prefix on infrahubctl examples can mislead users in uv-managed Copier-template setups, potentially causing quickstart commands to fail or behave unexpectedly.
• Given the issue is severity 4/10 and limited to docs usage guidance, the merge risk is minimal but worth a follow-up correction for smoother onboarding.
• Pay close attention to docs/docs/overview/quickstart.mdx - ensure infrahubctl command prefixes are consistent with the rest of the quickstart instructions.

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="docs/docs/overview/quickstart.mdx">

<violation number="1" location="docs/docs/overview/quickstart.mdx:90">
P2: The `infrahubctl` commands here dropped the `uv run` prefix that is consistently used for every other `infrahubctl` command in this document. In a uv-managed project created by the Copier template, these commands may fail with "command not found" when the user follows the tutorial.</violation>
</file>

<sub>Shadow auto-approve: would not auto-approve because issues were found.

Re-trigger cubic</sub>

[cubic-dev-ai]

P2: The infrahubctl commands here dropped the uv run prefix that is consistently used for every other infrahubctl command in this document. In a uv-managed project created by the Copier template, these commands may fail with "command not found" when the user follows the tutorial.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At docs/docs/overview/quickstart.mdx, line 90:

<comment>The `infrahubctl` commands here dropped the `uv run` prefix that is consistently used for every other `infrahubctl` command in this document. In a uv-managed project created by the Copier template, these commands may fail with "command not found" when the user follows the tutorial.</comment>

<file context>
@@ -80,31 +80,30 @@ You should see the Infrahub web interface with a navigation menu on the left sid
 
 ```bash
-uv run invoke schema-library-get
+infrahubctl marketplace get opsmill/dcim

</file context>

</details>

```suggestion
uv run infrahubctl marketplace get opsmill/dcim