feat: Register IEventOutbox as PostgreSqlEventOutbox in AddPostgreSqlOutbox()

[Copilot]

AddPostgreSqlOutbox() was not registering IEventOutbox, causing apps to fall back to the default OutboxEventStore which opens a separate Npgsql connection instead of sharing the caller's transaction. This mirrors the existing SQL Server pattern.

Changes

New: PostgreSqlEventOutbox

• public sealed class implementing IEventOutbox directly via ADO.NET
• Accepts IOptions<OutboxOptions>, TimeProvider, and optional IOutboxTransactionScope
• Enlists in the active NpgsqlTransaction from IOutboxTransactionScope when present; opens its own connection otherwise

Updated: RegisterPostgreSqlOutboxServices

• Now calls AddOutbox() then overrides IEventOutbox → PostgreSqlEventOutbox, IOutboxRepository → PostgreSqlOutboxRepository, and IOutboxManagement → PostgreSqlOutboxManagement (same pattern as SQL Server)

New: AddPostgreSqlOutboxTransactionScope<TUnitOfWork>()

• Convenience extension registering a UoW as IOutboxTransactionScope (Scoped), mirroring AddSqlServerOutboxTransactionScope<TUnitOfWork>()

services.AddPulse(config => config
    .AddPostgreSqlOutbox("Host=localhost;Database=MyDb;Username=postgres;******;")
    .AddPostgreSqlOutboxTransactionScope<MyUnitOfWork>() // IEventOutbox now uses UoW's NpgsqlTransaction
);

Tests

• Unit Tests:
  • PostgreSqlEventOutboxTests: constructor validation, transaction scope path, StoreAsync argument guards
  • PostgreSqlExtensionsTests: IEventOutbox registration type assertions + AddPostgreSqlOutboxTransactionScope coverage
• Integration Tests:
  • PostgreSqlAdoNetInitializer: database initializer that loads and executes the PostgreSQL OutboxMessage.sql script
  • PostgreSqlAdoNetOutboxTests: integration test class that inherits from OutboxTestsBase and tests the ADO.NET implementation against a real PostgreSQL container via Testcontainers

[codecov]

Codecov Report

❌ Patch coverage is 89.06250% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.28%. Comparing base (7bce6db) to head (d6719f3).

Files with missing lines	Patch %	Lines
...e.Pulse.PostgreSql/Outbox/PostgreSqlEventOutbox.cs	85.54%	7 Missing and 5 partials ⚠️
...se.PostgreSql/Outbox/PostgreSqlOutboxRepository.cs	94.44%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #370      +/-   ##
==========================================
+ Coverage   84.94%   90.28%   +5.33%     
==========================================
  Files         106      107       +1     
  Lines        3867     3983     +116     
  Branches      353      365      +12     
==========================================
+ Hits         3285     3596     +311     
+ Misses        496      284     -212     
- Partials       86      103      +17     

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[samtrion]

@copilot Also add Integration tests similar to SqlServerAdoNetOutboxTests

[Copilot]

@copilot Also add Integration tests similar to SqlServerAdoNetOutboxTests

Added PostgreSqlAdoNetOutboxTests integration test class and PostgreSqlAdoNetInitializer in commit 92c0cce. The test class inherits from OutboxTestsBase to run all outbox integration tests against a real PostgreSQL container using the ADO.NET implementation.

[samtrion]

@copilot Fix pipeline errors