rewrite Flow contract NatSpec to match current architecture

[thedavidmeister]

Summary

The previous Flow contract NatSpec described it as an abstract base inherited by ERC20/721/1155 mint-burn variants — the architecture before V5 consolidated to a single non-mint flow contract. The text contradicted the implementation:

• "Common functionality for flows" — Flow is concrete and is the only flow contract in src/concrete/.
• "This does NOT implement the preview and flow logic directly" — Flow directly implements both flow(...) and stackToFlow(...).

Rewrote to describe the concrete IFlowV5 implementation, the clone / factory pattern, per-clone isolation, and the Multicall + msg.value hazard that motivated removing native flows.

Closes #348.

Test plan

• build clean (NatSpec-only)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: aec00806-3db0-44e6-98cf-6ebfd88eafd2

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and 6e93fdc.

📒 Files selected for processing (1)

• src/concrete/Flow.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-07-issue-348-flow-contract-natspec

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