fix(server): load V2 replay fixtures on Windows

[CouchRiv]

What Changed

Use Effect's Path.fromFileUrl in the five V2 replay fixture readers.

Why

On Windows, decoding URL.pathname leaves a slash before the drive letter. An existing Claude approval replay fails with ENOENT while trying to read C:\C:\..., before reaching the orchestrator.

Converting the file URL through the platform path service lets the existing replay, contract and recovery tests load their transcripts. This targets the V2 branch in #2829.

Verified on Windows: the approval replay fails before the change and passes after it; the four other affected suites pass 17 tests, with one live-recording test skipped. Server typecheck and targeted lint/format checks pass.

Checklist

• This PR is small and focused
• I explained what changed and why

Implemented and verified with GPT-6 via Codex desktop.

[cursor]

Bugbot is paused — on-demand spend limit reached

Bugbot uses usage-based billing for this team and has hit its on-demand spend limit.

A team admin can raise the spend limit in the Cursor dashboard, or wait for the next billing cycle to continue.

[macroscopeapp]

Approvability

Verdict: Would Approve

Macroscope's review found this PR approvable — The change is limited to five replay test readers and uses the platform-aware path service to convert fixture URLs, fixing Windows path handling without affecting product runtime behavior. No defaults, schemas, production infrastructure, or static-analysis configuration are changed.

Not approved because:

• Monthly spending limit reached (workspace setting). Approvability relies on correctness review in order to determine eligibility

^{Review your spending limits in Billing settings. You can add or adjust custom eligibility rules. Learn more.}