docs: rewrite AI SDK landing page to model Exa's reference DX

[GreenFlux]

Summary

• Restructure docs/guide/ai-sdk.md to follow Exa's developer-reference layout: Install → Setup → Quickstart → Example → Use cases → Safety → All options → TypeScript → Links.
• Frame the SDK as framework-agnostic with Vercel AI SDK as the headline integration example.
• Mark the SDK as beta/preview to set expectations against the still-placeholder API surface, and add the Safety and guardrails section called out in the HF-53 brief.

Closes HF-53.

Test plan

• npm run docs:dev and verify the page renders under Guide → Integrations → HyperFormula AI SDK.
• Confirm all internal links (built-in functions, custom functions) and external links (HubSpot beta form, GitHub, npm) resolve.
• Sanity-check that no other guide pages are affected.

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Note

Low Risk
Documentation-only changes with no runtime or API behavior modifications; main risk is minor user confusion if previewed APIs/options diverge from implementation.

Overview
Rewrites docs/guide/ai-sdk.md into a more complete landing page with a clear flow (Install → Setup → Quickstart → Example → Use cases → Safety → Options → TS → Links) and positions the AI SDK as beta/preview.

Adds a concrete Vercel AI SDK generateText integration snippet, expands messaging around local/deterministic execution, and introduces a new Safety and guardrails section plus a table of planned createSpreadsheetTools options and TypeScript typing notes.

^{Reviewed by Cursor Bugbot for commit 810de4b. Bugbot is set up for automated code reviews on this repo. Configure here.}

[qunabu]

Task linked: HF-53 Create landing pages for AI toolchains

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[github-actions]

Performance comparison of head (810de4b) vs base (8b525cb)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 492.89 | 487.66 | -1.06%
                                      Sheet B | 156.36 | 156.74 | +0.24%
                                      Sheet T | 137.18 |  139.3 | +1.55%
                                Column ranges | 520.34 | 515.05 | -1.02%
Sheet A:  change value, add/remove row/column |  16.16 |     16 | -0.99%
 Sheet B: change value, add/remove row/column | 149.09 | 138.11 | -7.36%
                   Column ranges - add column |  163.5 | 154.06 | -5.77%
                Column ranges - without batch | 487.03 | 469.74 | -3.55%
                        Column ranges - batch | 122.86 | 120.58 | -1.86%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.18%. Comparing base (8b525cb) to head (810de4b).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1667   +/-   ##
========================================
  Coverage    97.18%   97.18%           
========================================
  Files          174      174           
  Lines        15086    15086           
  Branches      3223     3223           
========================================
  Hits         14662    14662           
  Misses         424      424           

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