Fix/#395

[Namiiikaze]

Fixes #395 — the auto-release eligibility query matched an impossible state (SHIPPED + deliveredAt set), so the worker never processed any escrows. This is a fresh implementation on a new branch, incorporating all feedback from the review on the previous PR attempt.

Core fix
findAutoReleaseEligible now queries for state: 'DELIVERED' instead of state: 'SHIPPED'. markDelivered is the only writer of deliveredAt and always sets state: 'DELIVERED' in the same update, so the old query could never match anything.
Consolidation
Deleted src/escrow/auto-release.service.ts (the unregistered duplicate implementation), which also had a double-subtraction cutoff bug producing a 9-day window instead of 48 hours.
auto-release.worker.ts is now the single implementation, using the atomic markAutoReleaseSubmitting claim to prevent double-submission across replicas.
Fixed a terminal-state inconsistency found during this work: the worker was calling markAutoReleaseCompleted (→ COMPLETED), while the manual-release flow in escrow.service.ts uses markAutoReleased (→ RELEASED). Standardized on RELEASED everywhere.
Config
AUTO_RELEASE_SOURCE_ADDRESS is now required, validated as a real Stellar public key (checksum-verified via Keypair.fromPublicKey), and the app fails to start with a clear error if it's unset, replacing the old placeholder-literal fallback.
Addressing review feedback from the previous attempt
Missing env var — Added AUTO_RELEASE_SOURCE_ADDRESS to .env.test, .env.example, and the env: blocks of test.yml, integration-test.yml, and e2e-test.yml, using a real, checksum-valid generated key.
Deleted tests that covered real behavior — Kept the repository-level markAutoReleaseSubmitting lock tests intact. Ported the service-level tests (two workers racing, lock released on failure, multiple escrows without collision) to run against the surviving AutoReleaseWorker.
Tests in a file CI doesn't run — Confirmed e2e-test.yml already runs .e2e-spec.ts files, so no relocation was needed; verified this rather than assuming.
Lint — Ran eslint --fix clean (0 errors).
Misleading error message — Reworded the missing-signer error to say the app fails to start, rather than that auto-release is "disabled."
Test fixtures

All auto-release test fixtures across 7+ files were rewritten to create escrows via SHIPPED → markDelivered() (matching real production state transitions) instead of directly constructing the previously-impossible SHIPPED + deliveredAt state.

Bugs found and fixed during implementation (beyond the original scope)
A hand-rolled placeholder Stellar address initially failed real checksum validation; replaced with a properly generated, Keypair.fromPublicKey-verified key everywhere it's used.
A colocated spec file (src/workers/auto-release.worker.spec.ts) was missed in the initial pass since it lives next to its source file rather than under test/; found and fixed to match.
A test helper (createDeliveredEscrow) was silently overriding explicitly-passed state: 'SHIPPED' values, which defeated an exclusion test's purpose; fixed so explicit states are respected.
3 TypeScript errors and 1 Jest syntax error caught via tsc --noEmit and fixed.
Test results

57/57 tests passing across unit, integration, and e2e tiers for all auto-release-related suites.
closes #395

[Omoboi-dev]

Resolve the conflict