fix(cloudflare): reduce staged CDN probe work

[james-elicx]

Summary

• classify each concrete route pathname once and defer alternate HTML/RSC/data representation admission to the final warm render
• use the existing uncapped --warm-cdn-concurrency value for both probing and final warming, keeping that shared pool saturated by unlocking siblings per pattern while preserving late route-resolution safety
• scope middleware-sensitive probe planning to runtime-equivalent matcher semantics, including decoded paths and i18n locale provenance
• route bypass and cacheability-probe renders through a cache-disabled response entrypoint so the gateway never executes renderer code locally
• preserve tag invalidation by routing uncached-render purges through the cache-bearing entrypoint

Validation

• vp check
• vp run vinext#build
• vp run @cloudflare/vinext#build
• 651 focused unit, deploy-flow, generated-config, and emitted-build tests
• five independent focused reviews clean after requested coverage
• Big Bonk: LGTM
• exact-head CI: 73/73 checks passed on fdeb0c74631d92800c9994f6f40efb0d8596a787

Stacked on #3155.

[james-elicx]

/bigbonk review for issues

[james-elicx]

/bigbonk review for issues

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Posted 1 actionable inline finding.

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[james-elicx]

/bigbonk review for issues

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Posted 1 actionable inline finding.

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[james-elicx]

/bigbonk review for issues

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[james-elicx]

/bigbonk review for issues. You have an 8 minute time limit; return the most important actionable findings before then.

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Posted 1 actionable inline finding.

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[james-elicx]

/bigbonk review for issues. Please review the current exact head c72b4b9 with an 8 minute time limit.

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Posted 1 actionable inline finding.

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[james-elicx]

/bigbonk review for issues

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UnknownError: The operation timed out.

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[james-elicx]

/bigbonk review for issues in the latest performance-layer diff only

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LGTM!

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