chore: support timestamp-ms delivery metadata + fix load test scripts

[alexluong]

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Project	Deployment	Preview	Comments	Updated (UTC)
outpost-docs	Ready	Preview	Comment	Oct 6, 2025 10:20am
outpost-website	Ready	Preview	Comment	Oct 6, 2025 10:20am

[Copilot]

Pull Request Overview

This PR enhances load testing capabilities by adding millisecond-precision timestamp support to destination metadata and fixing load test script status code expectations. The key improvements include infrastructure for more precise delivery latency measurements and corrected HTTP status code handling.

• Added support for millisecond-precision timestamps in destination metadata via new timestamp-ms field
• Fixed load test scripts to expect correct HTTP 202 status codes instead of 200
• Updated all destination provider constructors to accept BasePublisherOption parameters

Reviewed Changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
loadtest/src/tests/events.ts	Updated to expect 202 status code instead of 200
loadtest/src/tests/events-verify.ts	Added millisecond timestamp header parsing support
loadtest/src/tests/events-throughput.ts	Updated to expect 202 status code instead of 200
internal/destregistry/basepublisher.go	Added millisecond timestamp support and BasePublisherOption configuration
internal/destregistry/baseprovider.go	Updated to accept BasePublisherOption parameters
internal/destregistry/providers//dest.go	Updated constructor signatures to accept BasePublisherOption
internal/destregistry/providers/default.go	Added millisecond timestamp configuration to default provider registration
internal/config/destinations.go	Added configuration option for millisecond timestamps
contributing/loadtest/overview.md	Added comprehensive load testing documentation

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[Copilot]

Pull Request Overview

Copilot reviewed 31 out of 31 changed files in this pull request and generated 1 comment.

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