fix: satisfy SDK compliance harness 0.8.0

[marandaneto]

Problem

The SDK compliance workflow and local harness need to use SDK test harness release 0.8.0, with reusable GitHub workflow calls pinned to the release commit SHA instead of a mutable tag/branch. Running the updated harness exposed SDK/adapter compliance gaps in this repository.

Changes

• Pins the reusable SDK compliance workflow to PostHog/posthog-sdk-test-harness commit be8b8d5a3f94a249659844e94832e874f049c1e4.\n- Uses ghcr.io/posthog/sdk-test-harness:0.8.0 for local Docker harness runs / workflow harness version inputs.\n- Updates SDK compliance adapter and/or SDK behavior needed to pass the 0.8.0 compliance contract.

Tests

• SDK compliance Docker harness passed locally with project posthog_ruby_compliance (45/45).

[github-actions]

posthog-ruby Compliance Report

Date: 2026-06-29 14:19:47 UTC
Duration: 97877ms

✅ All Tests Passed!

45/45 tests passed

---

Capture Tests

✅ 29/29 tests passed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	9ms
Format Validation.Event Has Uuid	✅	105ms
Format Validation.Event Has Lib Properties	✅	110ms
Format Validation.Distinct Id Is String	✅	107ms
Format Validation.Token Is Present	✅	106ms
Format Validation.Custom Properties Preserved	✅	106ms
Format Validation.Event Has Timestamp	✅	109ms
Retry Behavior.Retries On 503	✅	5310ms
Retry Behavior.Does Not Retry On 400	✅	2109ms
Retry Behavior.Does Not Retry On 401	✅	2109ms
Retry Behavior.Respects Retry After Header	✅	8116ms
Retry Behavior.Implements Backoff	✅	15523ms
Retry Behavior.Retries On 500	✅	5213ms
Retry Behavior.Retries On 502	✅	5212ms
Retry Behavior.Retries On 504	✅	5212ms
Retry Behavior.Max Retries Respected	✅	15613ms
Deduplication.Generates Unique Uuids	✅	112ms
Deduplication.Preserves Uuid On Retry	✅	5212ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	10418ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	5215ms
Deduplication.No Duplicate Events In Batch	✅	112ms
Deduplication.Different Events Have Different Uuids	✅	107ms
Compression.Sends Gzip When Enabled	✅	106ms
Batch Format.Uses Proper Batch Structure	✅	107ms
Batch Format.Flush With No Events Sends Nothing	✅	4ms
Batch Format.Multiple Events Batched Together	✅	109ms
Error Handling.Does Not Retry On 403	✅	2109ms
Error Handling.Does Not Retry On 413	✅	2108ms
Error Handling.Retries On 408	✅	5212ms

Feature_Flags Tests

✅ 16/16 tests passed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	✅	109ms
Request Payload.Flags Request Uses V2 Query Param	✅	109ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	109ms
Request Payload.Flags Request Omits Authorization Header	✅	107ms
Request Payload.Token In Flags Body Matches Init	✅	107ms
Request Payload.Groups Round Trip	✅	107ms
Request Payload.Groups Default To Empty Object	✅	107ms
Request Payload.Person Properties Distinct Id Auto Populated When Caller Omits It	✅	107ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	107ms
Request Payload.Disable Geoip Omitted Defaults To False	✅	107ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	108ms
Request Lifecycle.No Flags Request On Init Alone	✅	4ms
Request Lifecycle.No Flags Request On Normal Capture	✅	105ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	110ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	105ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	109ms

[greptile-apps]

_{Reviews (1): Last reviewed commit: "chore: add SDK compliance harness 0.8.0" | Re-trigger Greptile}

[marandaneto]

i need to merge #202 first since i already added gzip support

[greptile-apps]

_{Reviews (2): Last reviewed commit: "fix retry-after handling in transport" | Re-trigger Greptile}