fix(metadata): write raw-DEFLATE appData (phase 2 of format convergence)

[insipx]

Summary

Phase 2 of the appData compression-format convergence (phase 1: #91). compressIfSmaller now emits raw DEFLATE (deflateRawSync) — the format iOS (COMPRESSION_ZLIB) and Android (Deflater(nowrap=true)) have always written and are the only format old installed apps can read natively.

• Writer: deflateSync → deflateRawSync; frame ([0x1f][size BE4]) unchanged.
• Reader try-order flipped to raw-first (canonical) with zlib fallback for historic blobs written before this flip; error precedence follows.
• Tests: new assertions that compressed output raw-inflates directly (what a raw-only reader does) and that a hand-built legacy zlib blob still parses. 499 passed.
• Pre-existing typecheck errors on main (serve.ts, send-attachment.ts — {} vs boolean) are untouched by this diff (metadata.ts + test only).

Rollout gate — met

Requires every server-side reader to have the #91 dual reader before merge:

• herald + hermes prod are on convos-cli@0.10.13 (verified: prod herald running convos-assistants 97e5749, which pins 0.10.13) ✅
• iOS/Android installed apps read raw natively — no app-release dependency; their merged zlib-fallback readers cover historic blobs in upcoming releases.

Draft until Andrew confirms merge timing. After this releases + the pin bump, the fleet writes one format and the zlib path becomes read-only legacy.

🤖 Generated with Claude Code

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Note

Write appData compressed bodies as raw DEFLATE with zlib fallback reader

• Changes compressIfSmaller in metadata.ts to use deflateRawSync instead of deflateSync, so new compressed blobs use raw DEFLATE framing rather than zlib-wrapped DEFLATE.
• Updates decompressIfNeeded to try inflateRawSync first and fall back to inflateSync for historic zlib-wrapped blobs, surfacing the raw-inflate error if both fail.
• Adds tests verifying the new writer emits raw DEFLATE and that the reader still accepts legacy zlib blobs.
• Behavioral Change: existing zlib-wrapped blobs remain readable, but all newly written compressed bodies change wire format.

^{Macroscope summarized b343767.}

[macroscopeapp]

Approvability

Verdict: Approved

Format convergence change switching compression output from zlib-wrapped to raw DEFLATE to match iOS/Android. Backward compatible (dual-format reader remains), well-tested, and authored by the same person who implemented phase 1 of this convergence.

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