Add SEO draft for interoperability patterns

[sarthakagrawal927]

This PR adds the SEO article draft for "Interoperability patterns for independently useful personal apps" under marketing/articles/significant-hobbies-hub/.

It respects all constraints:

• 1200-1800 words
• Evidence-backed from repo documents (AGENTS.md, PROJECT_STATUS.md, README.md, docs/)
• Includes frontmatter, outline, concrete examples, internal links, practical next actions, and source notes.
• Strictly informational and evidence-based (no invented metrics or keyword stuffing).
• Draft only, no routing or configuration changes.

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PR created automatically by Jules for task 4877675980633717739 started by @sarthakagrawal927

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[sarthakagrawal927]

Owner cancelled the bulk SEO/article batch during portfolio backlog calibration. Closing without merge; no product or runtime change from this PR is accepted.

[google-labs-jules]

Owner cancelled the bulk SEO/article batch during portfolio backlog calibration. Closing without merge; no product or runtime change from this PR is accepted.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.