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