EFP follow-ups: skill, Omnigraph example queries, and plugin documentation

[shrugs]

Tracking the documentation/DX follow-ups for the EFP (Ethereum Follow Protocol) integration landed in #2296. The PR ships the full EFP surface (indexer plugin, efp_* schema, Query.efp / Account.efp Omnigraph API) but intentionally leaves the following for a follow-up:

1. EFP agent skill

• No efp skill exists under packages/ensskills/skills/. Consider whether EFP querying warrants its own skill, or a section in the existing omnigraph skill, covering: the two-step Primary List validation, the validated follow graph (following/followers, block/mute exclusion), and protocol-level vs account-rooted queries (Query.efp vs Account.efp).
• Follow the placement rule in the root CLAUDE.md (external integrator knowledge → packages/ensskills or docs/ensnode.io, never internal AGENTS.md).

2. Omnigraph example queries

• packages/ensnode-sdk/src/omnigraph-api/example-queries.ts has no EFP entries. Add runnable examples for the common shapes, e.g.:
  • Account.efp.primaryList lookup
  • Account.efp.following / Account.efp.followers (the validated social graph)
  • Query.efp.lists(where:) / Query.efp.list(by:) browse
  • Account.efp.metadata(key:)
• These surface in the docs site and ENSAdmin.

3. EFP plugin documentation

• Document the efp plugin in docs/ensnode.io: how to enable it (PLUGINS), what it indexes, and the resulting API surface.
• Cross-link from the Omnigraph API reference and the plugins overview.

Refs: #2296

[coderabbitai]

🔗 Related PRs

#2107 - feat(docs): add planned integrations for ENSDb snapshots, CLI, and webhooks [merged]
#2112 - docs: enscli and ensskills docs [merged]
#2121 - docs refinements [merged]
#2209 - docs: add ENS Protocol Acceleration page to Omnigraph docs [merged]
#2265 - feat(ensapi): DomainResolver.effective (ENSv1 + ENSv2) [merged]

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