revert: flue-review Workers trace collection (#2372) — reviews hang in hydrating

[ascorbic]

What does this PR do?

Reverts #2372 (observability.traces.enabled on emdash-flue-review) to restore the PR review bot.

Evidence: flue-review redeployed with traces at 12:35 UTC today; every review attempted since then has hung silently in the hydrating stage until the watchdog kills it — the five bot-nextgen stack PRs on un-draft, a solo re-trigger of #2375, and its automatic stale-run retry (three attempts on one PR, all identical). No successful review has completed on the traced build; the last successes were all pre-deploy. Hydration is the reviewer's most I/O-intense phase (bulk R2/DO workspace writes), consistent with per-operation trace instrumentation as the mechanism. Live-tail transcript of the failure sequence available.

This restores the pre-#2372 config while the interaction is investigated (likely re-land shape: head_sampling_rate or a workaround for the hydration hot path). The bot being down blocks all PR review flow, so this is proposed for direct maintainer merge — the bot cannot review its own resuscitation.

Verification after merge + Workers Builds deploy: re-apply bot:review on #2375; the review should progress past Preparing PR within a few minutes.

Closes #

Type of change

• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes — n/a, config-only revert
• pnpm lint passes — n/a, config-only
• pnpm test passes — n/a, config-only
• pnpm format has been run — n/a, pure revert
• I have added/updated tests for my changes — n/a
• User-visible strings in the admin UI are wrapped for translation — n/a
• I have added a changeset — n/a, infra worker
• New features link to an approved Discussion — n/a

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: Claude Fable 5 (Claude Code)

Screenshots / test output

Watchdog signature on all failed runs: The review stopped reporting progress while in the 'hydrating' stage.

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[Copilot]

Pull request overview

Reverts enabling Cloudflare Workers trace collection for the infra/flue-review worker by removing the observability.traces.enabled block, aiming to restore normal operation of the PR review bot (which is reportedly hanging during the hydrating stage when traces are enabled).

Changes:

• Removes the observability.traces configuration from infra/flue-review/wrangler.jsonc.
• Keeps observability.enabled: true intact while disabling trace collection specifically.

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