# Session Summary – March 1, 2026
## Upload Pipeline + Filesystem Consolidation

Direct runtime upload model implemented and confirmed. Filesystem architecture docs consolidated.

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## What Shipped

### Upload Model
- Implemented direct runtime upload model
- Removed staging and symlink exploration entirely
- Uploads write atomically to runtime root
- Enforced by strict allowlist (`mods/*.jar`, `world/datapacks/*.zip`)

### Provenance
- Added `.zlh_metadata.json` provenance tracking
- Extended `stat` response with `source` field (`"user" | null`)
- No curated inference implemented (intentional)

### API Transport
- Identified `fetch()` streaming as source of upload proxy timing issues
- Switched to raw `http.request` piping (`req.pipe(proxyReq)` / `proxyRes.pipe(res)`)
- Confirmed agent upload via direct curl
- Upload timeout tuning identified as remaining work

### Documentation
- Consolidated filesystem architecture docs (`filesystem-and-file-browser.md`, `mod-deployment-safety.md`)
- Full zlh-grind repo consolidation pass (README, CONSTRAINTS, OPEN_THREADS, SESSION_START, ANTI_DRIFT, UPSTREAMS)

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## System State

- Read: Stable
- Write: Stable with shadow backup
- Delete: Constrained and safe
- Upload: Implemented, transport tuning in progress
- Console: Stable

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## Remaining Focus

- Upload transport diagnostics (distinguish client abort / upstream timeout / socket reset)
- Increase upload route timeout
- Dev server filesystem model planning (not yet designed)