feat: support p2p-only followers without DA

[tac0turtle]

Overview

Summary by CodeRabbit

• New Features

  • Followers without a configured DA service now sync through P2P only.
  • Aggregators retain a local DA service fallback when no address is configured.
  • DA components are initialized only when DA support is enabled.
  • Force-inclusion server startup now reports a clear error when DA is unavailable.

• Bug Fixes

  • Prevented unnecessary DA connections and submitter initialization for P2P-only nodes.

• Documentation

  • Updated DA configuration defaults and runtime behavior across the documentation.

[github-actions]

The latest Buf updates on your PR. Results from workflow CI / buf-check (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	⏩ skipped	✅ passed	⏩ skipped	Jul 15, 2026, 4:04 PM

[coderabbitai]

📝 Walkthrough

Walkthrough

DA defaults now support P2P-only followers while aggregators retain a fallback address. DA clients and dependent sync components are initialized only when enabled, with command guards, effective-address usage, tests, and updated documentation.

Changes

Conditional DA runtime

Layer / File(s)	Summary
DA configuration contract pkg/config/defaults.go, pkg/config/config.go, pkg/config/config_test.go, docs/...	Default DA addresses are empty, aggregators use the legacy fallback, and DAEnabled()/EffectiveDAAddress() behavior is tested and documented.
Conditional startup wiring apps/evm/cmd/..., apps/testapp/cmd/..., pkg/cmd/run_node.go	Initialization populates aggregator addresses; node and application startup conditionally create DA clients and use effective endpoints.
DA-optional sync components block/components.go, block/components_test.go, block/internal/syncing/syncer.go	Submitters, retrievers, forced-inclusion handling, and DA followers are omitted without a DA client, with nil-client coverage added.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant StartNode
  participant Config
  participant DAClient
  participant SyncComponents
  participant Syncer
  StartNode->>Config: Check DAEnabled()
  StartNode->>Config: Resolve EffectiveDAAddress()
  StartNode->>DAClient: Create client when enabled
  StartNode->>SyncComponents: Pass DA client or nil
  SyncComponents->>Syncer: Start synchronization
  Syncer->>Syncer: Start DA workers only when client exists

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Possibly related PRs

• evstack/ev-node#2221: Both changes modify DA client wiring during node startup.

Suggested reviewers: chatton, randygrok, tzdybal

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is just the template placeholder and does not include the required Overview details.	Fill in the Overview with context, goal, rationale, and any linked issue or tl;dr.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the main change: supporting P2P-only followers without DA.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch marko/p2p-only-follower-no-da

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[github-actions]

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