fix(nip33): rename info tag protocol_versions -> protocol_version

[grunch]

What

Rename the kind-38385 info-event tag protocol_versions → protocol_version (singular), in src/nip33.rs and docs/TRANSPORT_V2_SPEC.md.

Why

A client and a node are compatible only when they run the same protocol version, so the tag advertises a single value ("1" or "2"), never a list. The plural name was misleading. The emitting method is already singular (transport.protocol_version()); only the tag key string changes.

Coordination

Must land together with the matching changes in:

• mostro-cli (reader): feat(transport): Phase 3 — auto-detection + get-dm v2 + docs mostro-cli#178
• protocol spec: docs: protocol v2 (NIP-44 direct) transport — Phase 3 protocol#48

Until the daemon emits the new tag name, a CLI that reads protocol_version won't auto-detect this node's transport (falls back to gift-wrap).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3dad3f2b-a529-4b2d-9a38-18c4be5903a6

📥 Commits

Reviewing files that changed from the base of the PR and between 4c8259b and b293bcf.

📒 Files selected for processing (2)

• docs/TRANSPORT_V2_SPEC.md
• src/nip33.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/protocol-version-tag-singular

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