docs: fix wording, fix Rails floor

[cardmagic]

Improve prose

[greptile-apps]

Greptile Summary

This documentation-only PR improves introductory prose and corrects the documented Rails and SQLite compatibility floors.

• Refines the README’s description and comparison wording.
• Documents Rails 7.1 as the minimum supported version and SQLite 3.35 as the adapter floor.
• Clarifies the scope of the state-migration guide.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
README.md	Refines product descriptions and comparison wording without changing documented behavior.
docs/research/solid_queue.md	Corrects the Rails compatibility floor and removes the inaccurate SQLite feature rationale from the prior review thread.
docs/state-migrations.md	Clarifies that the guide applies to state already owned by Solid Objects.

_{Reviews (2): Last reviewed commit: "docs: state the SQLite floor without a r..." | Re-trigger Greptile}

[greptile-apps]

Incorrect SQLite floor rationale

This attributes the SQLite 3.35 floor to RETURNING, but Solid Objects does not use that feature and the adapter documentation associates SQLite support with serialized write transactions. The explanation therefore gives readers an inaccurate basis for compatibility and design decisions.

Suggested change

	- SQLite documentation inspected covers current SQLite behavior. Solid Objects requires SQLite 3.35 or newer for `RETURNING` support.
	- SQLite documentation inspected covers current SQLite behavior. Solid Objects supports SQLite 3.35 or newer.

Knowledge Base Used: Configuration and database adapters

Prompt To Fix With AI

This is a comment left during a code review.
Path: docs/research/solid_queue.md
Line: 529

Comment:
**Incorrect SQLite floor rationale**

This attributes the SQLite 3.35 floor to `RETURNING`, but Solid Objects does not use that feature and the adapter documentation associates SQLite support with serialized write transactions. The explanation therefore gives readers an inaccurate basis for compatibility and design decisions.

```suggestion
- SQLite documentation inspected covers current SQLite behavior. Solid Objects supports SQLite 3.35 or newer.
```

**Knowledge Base Used:** [Configuration and database adapters](https://app.greptile.com/craftsmanfounder/-/custom-context/knowledge-base/cardmagic/solid_objects/-/docs/configuration-and-database-adapters.md)

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

[cardmagic]

Correct. The code does not use RETURNING, and the floor comes from the startup version check (201fd33). Fixed in 539a0a0: the entry now states the supported version without a feature rationale.