feat(explain): phase progress for fetch + data-loading pipeline#1222

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feat/explain-fetch-progress

Commits on May 20, 2026

feat(explain): typed FetchAttemptError for fetch diagnostics

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feat(explain): phase progress renderer for explain pipeline

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feat(explain): narrate every fetch-fallback attempt as a phase event

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feat(explain): tick sub-steps for the inner data-loading phase

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chore(explain): address PR #1222 review feedback

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refactor(explain): collapse load-phase guards into loadFinished flag

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