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+# Session Log — ZeroLagHub (Execution Ledger)
+
+Chronological ledger of notable execution work. Keep this high signal; link to code PRs/commits in upstream repos when available.
+
+---
+
+## 2026-02-07 → 2026-02-08 — Console stabilization
+- Migrated console from log tailing to **PTY-backed interactive console** over WebSockets.
+- Hardened WS stability:
+  - moved to a single-writer pattern
+  - ensured exactly one PTY read loop per `{vmid, container_type}`
+- Fixed "it works but not on prod" issues caused by stale binaries still running.
+- Confirmed systemd points to `/opt/zlh-agent/current/zlh-agent` with `current -> releases/<ver>` layout.
+
+---
+
+## 2026-02-21 → 2026-02-22 — Game telemetry routing + agent Phase 1 feature set
+
+### API (control plane)
+- Added `src/routes/game.js`, mounted at `/api/game`.
+- Added:
+  - `GET /api/game/servers/:id/players` (Redis-backed, normalized response)
+  - `GET /api/game/servers/:id/update-status` (agent version + update state)
+- Extended `src/utils/agentPoller.js`:
+  - poll agent `GET /game/players` for game containers
+  - poll agent `GET /version` + `GET /agent/update/status`
+  - cache `agentVersion`, `updateStatus`, `updateAvailable`
+- Persisted `engineType`/`engineVersion` in `ContainerInstance` on provisioning.
+- Rolled back provisioning-time agent update triggers (back to direct `/config` flow).
+
+### Frontend (portal)
+- Game console polling switched to:
+  - `GET /api/game/servers/:id/players`
+  - `GET /api/game/servers/:id/update-status`
+- UI shows player count + optional name list.
+- Version context rendered as `Version: X` or `Version: X -> Y`.
+
+### Agent (runtime)
+- `/game/players` hardened for more reliable Minecraft presence (port/protocol fallbacks).
+- Added periodic update checks:
+  - `ZLH_AGENT_UPDATE_MODE=notify|auto|off`
+  - `ZLH_AGENT_UPDATE_INTERVAL` (default `30m`)
+- Implemented Phase 1 mod management:
+  - `GET /game/mods`
+  - `POST /game/mods/install` (allowlist + redirect constraints + size cap + sha256 verify)
+  - `PATCH /game/mods/:mod_id` (enable/disable)
+  - `DELETE /game/mods/:mod_id` (moves to `mods-removed/`)
+- Implemented `GET /metrics/process` (PID + VmRSS/VmSize; restart_count mapped to crashCount).
+- Added Minecraft readiness probe after start/restart and stop-wait-before-restart sync to reduce restart races.
+- Added `lifecycle.log` for lifecycle/probe diagnostics.
+
+### Artifacts
+- Expanded Minecraft artifact tree to include **NeoForge** under `/opt/zlh/zpacks/minecraft/neoforge/<mc_version>/`.
+- Encountered installer naming contract mismatch; Phase 1 fix is to normalize the NeoForge installer filename for predictable installs.
+
+---
+
+## 2026-02-22 — Architecture strategy session (Claude)
+
+### Artifact server strategy decided
+- Moved away from self-hosting all mod artifacts.
+- `zlh-artifactd` Phase 1 scope: **mod resolver only** (Modrinth API + NeoForge maven).
+  - No local mod storage in Phase 1; agent fetches from upstream, verifies hash.
+  - Local caching added in Phase 2 based on real usage patterns.
+- Full artifact orchestrator (game jars, runtimes, mods unified) is the Phase 3 vision.
+- Rationale: single-operator sustainability; learn ingestion patterns from mods before automating game jars.
+
+### Mod platform decision
+- **Modrinth** as primary source (open API, no key required, hash provided, NeoForge/Fabric/Forge/Quilt filter support).
+- **CurseForge**: manual SFTP upload by user (their friction, not ours).
+- Modrinth API base: `api.modrinth.com/v2`, rate limit 300 req/min, requires User-Agent header.
+
+### NeoForge versions for artifact server
+- **1.21.1** — highest mod ecosystem density (16,000+ mods)
+- **1.21.4** — next significant stable adoption
+- **1.21.11** — current latest
+- 1.20.x NOT needed for NeoForge; existing Forge covers that ecosystem.
+
+### Vanilla MC versions to add
+- Currently at 1.21.7; need to add 1.21.8 through 1.21.11.
+- Source: Mojang version manifest at `piston-meta.mojang.com/mc/game/version_manifest_v2.json`.
+
+### Confirmed loader coverage at launch
+- Vanilla, Paper, Purpur, Forge, Quilt (covers Fabric mods too) — already in place.
+- NeoForge added (3 versions above).
+- No Fabric standalone needed; Quilt provides compatibility.
+
+---
+
+## Next session targets
+- API: proxy agent mod + process metrics endpoints behind auth/ownership.
+- Artifacts: add vanilla 1.21.8–1.21.11 jars + confirm NeoForge naming contract resolved.
+- Frontend: add Mods UI surface using API proxy endpoints.
+- zlh-artifactd: Phase 1 design (Modrinth resolver, no local mod storage).