Add cookbooks section with fixed MDX, corrected API usage

[Nishkarsh1606]

Description

Merges the cookbook-uploading branch content into the docs site, fixes all MDX parsing errors, corrects API usage across 4 use-case cookbooks to match real HydraDB endpoints, and consolidates everything under a new Cookbooks navigation tab with an introduction landing page.

• 8 new cookbook MDX files added from cookbook-uploading branch
• Fixed MDX parsing errors (bare < outside code fences, broken YAML frontmatter, parentheses in filenames)
• Corrected API usage in glean-clone, ai-chief-of-staff, ai-linkedin-recruiter, ai-travel-planner: replaced fictional endpoints/methods with real HydraDB API calls
• Migrated 4 use-case pages into cookbooks directory, removed Use Cases nav group
• Added cookbooks introduction page with card grid
• Cleaned up titles and replaced em dashes throughout

Related Issue

Closes #

Type of Change

• Content fix (typo, broken link, incorrect info)
• New content (guide, tutorial, API docs)
• Structural change (navigation, layout)
• CI/Build

Checklist

• I have read the CONTRIBUTING guidelines
• This PR is linked to an issue
• My commits are signed off (git commit -s) per the DCO
• mintlify dev renders my changes correctly
• I have not committed any secrets or credentials
• No internal system details are exposed in the content

[greptile-apps]

Greptile Summary

This PR adds a new Cookbooks navigation section with 12 MDX guides, migrates 4 existing use-case pages into it, fixes MDX parsing errors, and corrects API usage across the moved files to match real HydraDB endpoints. The bulk of the content is well-structured and the API patterns (client.upload.knowledge, client.recall.fullRecall, recency_bias, sub-tenant isolation) are consistent across the new cookbooks.

• P1 — cookbooks/hydradb-cookbook-06.mdx line 32 contains a Cloudflare email-obfuscation artifact (/cdn-cgi/l/email-protection#...) that will render as a broken link in Mintlify; replace with a plain mailto: link.
• P2 — Two cards in cookbooks/index.mdx (and two entries in the Cookbooks nav in docs.json) are both titled "AI Chief of Staff", pointing to different pages with no visible distinction.

Confidence Score: 4/5

Safe to merge after fixing the broken email link in hydradb-cookbook-06.mdx; the duplicate nav entry is a usability issue worth resolving before or shortly after merge.

One P1 content defect (broken contact link in a published cookbook) should be fixed before the page goes live. The duplicate "AI Chief of Staff" nav entry is confusing but not blocking. All other findings are P2 style/consistency suggestions.

cookbooks/hydradb-cookbook-06.mdx (broken email link, P1) and cookbooks/index.mdx / docs.json (duplicate AI Chief of Staff entries, P2).

Important Files Changed

Filename	Overview
cookbooks/hydradb-cookbook-06.mdx	New "AI Chief of Staff – Function Routing" cookbook; contains a Cloudflare email-obfuscation artifact (P1) and uses a top-level type field inconsistent with the source convention corrected elsewhere in this PR.
cookbooks/index.mdx	New cookbooks landing page with a card grid; two cards titled "AI Chief of Staff" point to different pages with no distinction, which will confuse readers.
docs.json	Adds a new Cookbooks navigation tab listing all 12 cookbook pages; removes the old Use Cases group; navigation structure is valid.
cookbooks/glean-clone.mdx	Moved from use-cases and updated with real HydraDB endpoints; normalized data schema, batch upload, and verify-processing patterns look consistent with other cookbooks.
cookbooks/ai-chief-of-staff.mdx	Renamed from use-cases; em dashes replaced with hyphens; API usage updated to use real client.recall.fullRecall and client.userMemory.add SDK calls.
cookbooks/ai-linkedin-recruiter.mdx	Moved from use-cases; corrected type → source and added tenant_id/sub_tenant_id to the candidate profile schema, aligning with the real ingestion API.
cookbooks/ai-travel-planner.mdx	Moved from use-cases; API calls updated to use real client.upload.knowledge, client.recall.fullRecall, and client.userMemory.add SDK methods.
cookbooks/ai-onboarding-agent.mdx	New cookbook using the Python SDK throughout; phased structure, real endpoints, and correct tenant_id/sub_tenant_id usage.
cookbooks/customer-support-agent.mdx	New cookbook demonstrating the two-call recall pattern; API usage is consistent and correctly uses POST /recall/full_recall and POST /recall/recall_preferences.
cookbooks/cookbook-01-build-cursor-for-docs.mdx	New cookbook with a phased guide for a codebase Q&A assistant; endpoints and SDK patterns are consistent with the rest of the PR.
cookbooks/competitive-intelligence-agent.mdx	New cookbook; correct use of recency_bias, sub-tenant per competitor, and real API endpoints.
cookbooks/internal-search-perplexity.mdx	New cookbook for company-wide search; API calls and ingestion patterns are consistent with other cookbooks in the PR.
cookbooks/cookbook-04-build-notion-ai.mdx	New IT support agent cookbook; endpoints and recall patterns look correct.
cookbooks/cookbook-10-ai-financial-analyst.mdx	New financial analyst cookbook; recency_bias and temporal graph usage are correctly demonstrated.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["docs.json\nCookbooks tab added\nUse Cases tab removed"] --> B["cookbooks/index.mdx\n12-card landing grid"]
    B --> C1["Moved from use-cases\nglean-clone\nai-chief-of-staff\nai-linkedin-recruiter\nai-travel-planner"]
    B --> C2["New cookbooks\ncookbook-01 · cookbook-04\ncookbook-10 · customer-support\ncompetitive-intel · perplexity\nai-onboarding · hydradb-cookbook-06"]
    C1 -->|"API corrections applied"| D["Real HydraDB endpoints\nPOST /ingestion/upload_knowledge\nPOST /recall/full_recall\nPOST /recall/recall_preferences\nPOST /memories/add_memory"]
    C2 --> D
    B -->|"duplicate title"| E["ai-chief-of-staff.mdx\nhydradb-cookbook-06.mdx\nboth titled AI Chief of Staff"]
    C2 -->|"broken link"| F["hydradb-cookbook-06.mdx\nCloudflare email artifact\nline 32"]

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