Added a dependency catalog section to AGENTS.md

[9larsons]

The pnpm catalog now pins ~60 shared dependencies, and catalogMode is strict — so a contributor running pnpm add will see the dependency routed into pnpm-workspace.yaml automatically, with nothing in the repo explaining why.

[coderabbitai]

Walkthrough

This PR adds a "Dependency Catalog" section to AGENTS.md that documents centralizing shared dependency versions in pnpm-workspace.yaml via catalog: (including named catalog:<name>), explains catalogMode: strict routing of pnpm add into the catalog, and notes that pnpm publish rewrites catalog: references for @tryghost/* packages while advising against npm publish.

Possibly related PRs

• TryGhost/Ghost#27902: Introduces catalogMode: strict behavior referenced by the new documentation.
• TryGhost/Ghost#27946: Updates workspace/package files to use catalog: references for shared devDependencies, matching the documentation’s usage examples.
• TryGhost/Ghost#27958: Moves bson-objectid to a pnpm catalog-managed version, an example of the catalog workflow described in the docs.

Suggested reviewers

• EvanHahn
• troyciesco

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly reflects the main change: adding documentation about the pnpm dependency catalog to AGENTS.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description accurately explains the problem being addressed: the pnpm catalog with strict mode causing automatic dependency routing, and the lack of documentation about this behavior.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/pnpm-catalog-contributor-guide

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