Feat/e2e full pipeline

[shogun444]

Summary

This PR implements the backend integration testing scope for Issue #179 by adding end-to-end coverage across the complete execution pipeline:

• Task submission
• Coordinator orchestration
• Agent dispatch
• Payment release
• Smart contract interaction

The implementation reuses the existing E2E testing infrastructure without introducing new configuration or test runners.

Changes

Added

tests/e2e/full-pipeline.test.ts

Covers:

• Complete 5-node DAG execution
• Agent dispatch across all stages
• Payment release verification
• Final report validation
• Graceful agent failure handling
• 404 for unknown task IDs
• 400 validation for invalid requests

tests/e2e/agent-lifecycle.test.ts

Covers:

• Agent registration
• Agent discovery
• Agent detail retrieval
• Task execution using the registered agent
• Challenge/signature authenticated deregistration
• Registry cleanup verification

Updated

backend/tests/e2e/pipeline.test.ts

Added integration coverage for:

• HTTP 500 responses from agents
• Payment release verification during HTTP dispatch

smart-contracts/tests/e2e/market-report.test.ts

Added assertions for:

• Registry state after agent registration
• lockTxHash validation
• releaseTxHash validation

The existing RUN_STELLAR_E2E_TESTS gate remains unchanged.

Design

• Reused the existing createApp({ dispatch, releasePayment }) pattern
• Reused existing helpers and on-chain test infrastructure
• Kept a single testing approach per file
• Added assertions without expanding test infrastructure
• No configuration changes
• No new dependencies

Test Results

Root E2E

• 5 test suites passed
• 11 tests passed

Backend

• All unit tests passed
• All integration tests passed
• Existing pipeline tests passed

Smart Contracts

• 103 tests passed
• 4 gated E2E tests skipped as expected when RUN_STELLAR_E2E_TESTS is not enabled

Closes #179

Steps to reproduce

# 1. Full pipeline + agent lifecycle + scenarios (11 tests)
node backend/node_modules/jest/bin/jest.js \
  --config tests/e2e/jest.config.js \
  --runInBand \
  --forceExit

# 2. Backend pipeline E2E with HTTP dispatch + payment (12 tests)
node backend/node_modules/jest/bin/jest.js \
  --config backend/jest.config.js \
  --runInBand \
  --forceExit \
  --testPathPattern "tests/e2e/pipeline"

# 3. Frontend wallet E2E (5 tests)
cd frontend

npx playwright test \
  --project chromium \
  --grep "Wallet"

Expected output:

• Root E2E: 11 tests passed
• Backend pipeline E2E: 12 tests passed
• Frontend wallet E2E: 5 tests passed

Include screenshots of the final test summary for each command.

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