fix: correct findOne docs to use top-level PK instead of where wrapper

[pyramation]

Summary

The ORM docs generator (docs-generator.ts) was emitting findOne({ where: { id: '<value>' }, ... }) in generated documentation, but the actual SDK signature produced by model-generator.ts is findOne({ id: '<value>', select: ... }) — the primary key is a top-level parameter, not nested under where.

This fix updates three doc generation functions to emit the correct signature:

• generateOrmReadme — README.md code examples
• generateOrmAgentsDocs — AGENTS.md method signatures
• generateOrmSkills — per-table skill file usage snippets

Snapshot tests in cli-generator.test.ts were updated to match the corrected output (4 snapshots).

Closes constructive-io/constructive-planning#623

Review & Testing Checklist for Human

• Verify the corrected findOne signature ({ pk, select }) matches what model-generator.ts actually generates — cross-reference with a generated model file like sdk/constructive-sdk/src/admin/orm/models/invite.ts (line ~100)
• Decide whether the already-committed .md skill/README files in constructive-sdk (and constructive-db) need to be regenerated as part of this PR or as a follow-up. This PR only fixes the generator — existing generated docs still contain the old where syntax.
• Spot-check that update and delete methods still correctly use where in the generated docs (only findOne should have changed)

Notes

• The SDK runtime code is not affected — only generated documentation was wrong
• constructive-db doesn't appear to call findOne in its tests, which is why this never surfaced as a test failure
• Link to Devin run: https://app.devin.ai/sessions/3a915cb6aef041428e0cdecd87f9e12c
• Requested by: @pyramation

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