docs: correct saveSession JSDoc default in importer config

[devin-ai-integration]

Summary

The JSDoc for saveSession on OneSchemaInitParams in packages/importer/src/config.ts says "Defaults to false", but:

• DEFAULT_PARAMS in the same file sets saveSession: true.
• The public docs at docs.oneschema.co/docs/javascript#savesession state "Defaults to true".
• importer.ts only reads/writes the resume token when mergedParams.saveSession is truthy, so the true default is what's actually observed in practice.

This PR updates the inline docstring to "Defaults to true" so it matches the code default and the public docs. No runtime behavior change.

Context: this mismatch came up while debugging a customer who had passed is_required: true via templateOverrides and saw it silently not take effect. The root cause was that the SDK was resuming a cached session (per the default saveSession: true), which skips re-applying templateOverrides. The defaults are working as designed; the docstring was the only thing out of sync.

Scope note: intentionally not touching the saveSession JSDoc in packages/filefeeds/src/config.ts or packages/filefeeds-react/src/OneSchemaFileFeeds.tsx — the FileFeeds DEFAULT_PARAMS does not set saveSession, so it genuinely defaults to falsy there.

Review & Testing Checklist for Human

• Confirm "Defaults to true" is the intended behavior for @oneschema/importer going forward (matches public docs today).
• Sanity-check that no downstream consumer relies on the wrong JSDoc being authoritative (unlikely — it's a docstring).

Notes

Pure docstring change; no tests or behavior affected.

Link to Devin session: https://app.devin.ai/sessions/ece94f7d5a6241b8ad1c3ed12a3f0b3b

[devin-ai-integration]

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