feat: ai-cache plugin [Phase 1a]#13424

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janiussyafiq wants to merge 17 commits into

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janiussyafiq:feat/ai-cache-pr1

Commits on May 22, 2026

feat(ai-providers): stash parsed raw response body on ctx
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feat(ai-cache): add minimal SHA-256 cache-key derivation
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feat(ai-cache): add PR-1 schema (policy + exact.ttl + redis schema)
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feat(ai-cache): add plugin skeleton with check_schema
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feat(ai-cache): register plugin in default enabled-plugins list
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feat(ai-cache): add access phase for protocol gate + SKIP-STREAM + MISS
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feat(ai-cache): write upstream body to Redis in log phase
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feat(ai-cache): short-circuit on Redis HIT in access phase
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test(ai-cache): regression test for Redis-unreachable fail-open
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docs(ai-cache): add PR-1 plugin reference
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docs(ai-cache): defer reference doc until the series is complete
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test(ai-cache): split key invariant tests into ai-cache-key.t
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test(ai-cache): assert schema rejection messages, not just rejection
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refactor(ai-cache): rename PR-N references to Phase 1{a..e}
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refactor(ai-cache): use if/then/else for policy-specific Redis schema
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refactor(ai-cache): return (code, body) instead of ngx.print + ngx.exit
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test(ai-cache): match TEST 1 style to the rest of ai-cache-key.t
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