docs(sdk): add wren-core-wasm SDK page

[goldmedal]

Summary

Adds a dedicated SDK page for the browser/WASM build, mirroring the structure of langchain.md and pydantic.md:

• When to use it — comparison table vs the Python SDKs (runtime, data source, MDL source, agent tools).
• Installation — npm + CDN (with the unpkg vs jsDelivr caveat).
• Three quickstart patterns — URL mode (remote Parquet), inline data (registerJson / registerCsv / registerParquet), cube queries.
• API reference — every public method on WrenEngine including the full CsvReadOptions table.
• Integration patterns — bundler config, multiple engines per page, cubes as the agent surface.
• Troubleshooting + Limitations — including the 72 MB binary, single-threaded execution, no memory module.

Other touch-ups

• overview.md: list wasm as an Available SDK; move pydantic out of "Coming soon" since it's shipped.
• cube.md: link to the new wasm.md alongside the existing AGENT_GUIDE link.

PR target

Targets feat/wasm-cube so this docs PR rides the same train as the rest of the cube/WASM work (PRs #2264 – #2283).

Test plan

• Relative links resolve (./langchain.md, ./pydantic.md, ../guides/modeling/cube.md).
• Type list under registerCsv matches the Rust accept list (incl. date32).
• CubeQueryInput shape matches core/wren-core-wasm/sdk/src/index.ts.

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Summary by CodeRabbit

• Documentation
  • Added comprehensive WASM SDK documentation including setup guides, API reference, multiple data-loading flows, and troubleshooting.
  • Listed Pydantic AI as an available integration option.
  • Documented Browser/WebAssembly SDK for in-browser semantic SQL operations with no server or CLI bootstrap required.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/core/sdk/wasm.md`:
- Line 54: The document contains inconsistent WASM size values: the sentence
containing "the WASM binary is ~68 MB raw." conflicts with other occurrences of
"~72 MB"; please verify the actual WASM binary size and replace all occurrences
of "~68 MB" and "~72 MB" with the verified, single correct value so the document
is consistent (search for the exact strings "the WASM binary is ~68 MB raw." and
"~72 MB" to locate each instance).

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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📒 Files selected for processing (3)

• docs/core/guides/modeling/cube.md
• docs/core/sdk/overview.md
• docs/core/sdk/wasm.md

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/core/sdk/wasm.md`:
- Around line 98-99: The docs use two different terms for an empty
profile.source (''), causing confusion; pick one consistent term (e.g., call
empty profile.source '' "auto-detect mode") and update all occurrences to that
term or explicitly document the distinction (e.g., clarify that profile.source:
'' enables auto-detect while "local mode" refers to an explicit local path).
Update the lines referencing loadMDL and any mentions at the other indicated
spots (around the examples using profile.source, pre-register tables before
loadMDL, and the examples at the later sections) so every mention of
profile.source: '' uses the chosen term and add one brief sentence where needed
to state the difference between auto-detect (empty string) and an explicit local
path.

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Fix all unresolved CodeRabbit comments on this PR:

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• Create a new PR with the fixes

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📒 Files selected for processing (1)

• docs/core/sdk/wasm.md