Merge pull request 'tune: switch compression model from strix-moe to syslog-auto' (#25) from tune/compression-syslog-auto into master

Reviewed-on: #25

AGENTS.md

@@ -128,3 +128,10 @@ safe-mutate --verify "CMD" [--expect "PATTERN"] --mutate "CMD" [--reason "WHY"]
 Read the [Authoring Guide](docs/AUTHORING-GUIDE.md) before writing any new contract.
 It covers the full process: verify → draft → lint → review → ship, with templates
 and style rules.
+
+## Maintaining this file
+
+Keep this file for knowledge useful to almost every future agent session in this project.
+Do not repeat what the codebase already shows; point to the authoritative file or command instead.
+Prefer rewriting or pruning existing entries over appending new ones.
+When updating this file, preserve this bar for all agents and keep entries concise.

CLAUDE.md

@@ -0,0 +1 @@
+AGENTS.md

contract-registry.yaml

@@ -22,6 +22,7 @@ owners:
 - abiba
 - mumuni
 - kwame
+- ops
 trigger_types:
 - scheduled
 - event_driven
@@ -58,6 +59,7 @@ index:
     - memory-audit-maintenance
     - gpu-fleet
     - infrastructure-update
+    - infrastructure-maintenance
     reference:
     - infrastructure-control
     - ra-h-os-custodianship-contract
@@ -90,6 +92,7 @@ index:
     - infrastructure-control
     - infrastructure-monitoring
     - infrastructure-update
+    - infrastructure-maintenance
     - pm2-self-heal
     - disk-gc-threat-response
     gpu:
@@ -130,7 +133,6 @@ index:
     - build-zulip-plugin
     - stirling-pdf-agent-access
     - gpu-fleet
-    - infrastructure-update
     - infrastructure-control
     - zulip-adapter-lessons
     - pi-approval-architecture
@@ -144,6 +146,9 @@ index:
     - mumuni-delegation
     kwame:
     - hello-world
+    ops:
+    - infrastructure-maintenance
+    - infrastructure-update
   by_trigger:
     scheduled:
     - hermes-key-enforcement
@@ -156,6 +161,7 @@ index:
     - litellm-health
     - memory-audit-maintenance
     - infrastructure-update
+    - infrastructure-maintenance
     event_driven:
     - litellm-self-heal
     - pm2-self-heal
@@ -197,6 +203,7 @@ index:
     - hermes-zulip-plugin
     - build-zulip-plugin
     - infrastructure-update
+    - infrastructure-maintenance
     - ra-h-os-custodianship-contract
     - mumuni-delegation
     normal:
@@ -1256,13 +1263,108 @@ contracts:
   last_run: null
   last_status: null
   drift_alerts: []
+- name: infrastructure-maintenance
+  file: infrastructure-maintenance.prose.md
+  kind: responsibility
+  category: maintenance
+  sensitivity: high
+  status: active
+  owner: ops
+  version: 1.0.0
+  trigger:
+    type: scheduled
+    cadence: 0 2 * * 0
+    description: Weekly host-level maintenance Sunday at 2am ET (replaces infrastructure-update
+      build-phase role; infra-update moves to ops)
+    cron_job_id: null
+  execution:
+    agent: ops
+    timeout: 3600
+    requires:
+    - infrastructure-monitoring run within last 30 minutes (pre-update health baseline)
+    - Proxmox snapshot of primary host OR /tmp backup dir created this run
+    - LiteLLM master key from Infisical vault for health verification
+    protocol:
+    - Load contract from prose-contracts/main
+    - Phase 0 preflight — capture health baseline, backup check, record image baseline
+    - Phase 1 apt update && apt upgrade -y on primary host
+    - Phase 2 docker compose pull for LiteLLM, SearXNG, and other running containers
+    - Phase 3 restart stacks one at a time with per-stack health verification
+    - Phase 4 verify every critical service (LiteLLM, SearXNG, Zulip, Gitea, PM2, Hermes gateways)
+    - On failure — rollback per protocol, escalate, do not loop beyond circuit breaker
+    - Log actions to ~/.hermes/runs/infrastructure-maintenance/
+  verification:
+    postconditions:
+    - check: all critical services running after update
+      verify: 'curl -sf http://192.168.68.116/litellm/v1/models && curl -sf https://chat.sysloggh.net/api/v1/server_settings && curl -sf https://git.sysloggh.net/api/v1/version && curl -sf http://192.168.68.7:8888 && pm2 jlist'
+      expect: all probes 200 OK / processes online
+    - check: no regressions from pre-update health baseline
+      verify: diff Phase 0 health-baseline against Phase 4 results
+      expect: no GREEN service turned RED
+    - check: docker containers on latest stable tags
+      verify: docker inspect --format '{{.Config.Image}}' <container> per service matches image-baseline.pulled_tag
+      expect: all containers running pulled tags
+    - check: APT packages up to date with no held broken packages
+      verify: apt list --upgradable 2>/dev/null | wc -l and apt-get -s upgrade | grep -ci broken
+      expect: upgradable == 0, broken == 0
+    artifact: maintenance run report with phase results and any rollback/escalation
+    verify_commands:
+    - curl -sf http://192.168.68.116/litellm/v1/models
+    - curl -sf http://192.168.68.7:8888
+    - curl -sf https://chat.sysloggh.net/api/v1/server_settings
+    - curl -sf https://git.sysloggh.net/api/v1/version
+    - pm2 jlist
+  receipt:
+    format: json
+    storage: ~/.hermes/runs/infrastructure-maintenance/
+    graph_node: true
+    schema:
+      contract: string
+      run_id: string
+      timestamp: ISO 8601
+      agent: string
+      status: pass|fail|escalated
+      phase: preflight|apt|images|restarts|verify|rollback|done|failed
+      actions_taken: array
+      postconditions: array
+      drift_alerts: array
+      evidence_path: string
+  escalation:
+    info:
+      action: log_to_receipt
+      notify: []
+    warning:
+      action: relay_alert
+      notify:
+      - abiba
+      - mumuni
+    critical:
+      action: relay_alert
+      notify:
+      - abiba
+      - mumuni
+    fatal:
+      action: relay_alert + pause + human_required
+      notify:
+      - abiba
+      - mumuni
+      - kwame
+  circuit_breaker:
+    max_retries: 2
+    window: 7200
+    trip_action: escalate_to_fatal
+  depends_on:
+  - infrastructure-monitoring
+  last_run: null
+  last_status: null
+  drift_alerts: []
 - name: infrastructure-update
   file: infrastructure-update.prose.md
   kind: responsibility
   category: maintenance
   sensitivity: high
   status: active
-  owner: abiba
+  owner: ops
   version: 1.0.0
   trigger:
     type: scheduled

gpu-fleet.prose.md

@@ -125,7 +125,7 @@ Note: All syslog-auto entries route directly to GPUs with `api_key: not-needed`.
 
 | Alias | RPM Cap | Routes To | Purpose |
 |-------|---------|-----------|---------|
-| `strix-moe` | 40 | Strix Halo | Agent reasoning, compression (~30% via syslog-auto pool) (MoE models) |
+| `strix-moe` | 40 | Strix Halo | Compression tasks (MoE models) |
 | `gpu-dense` | 500 | RTX 3090 | Heavy reasoning |
 | `gpu-light` | 500 | RTX 5070 | Vision, web extract, light tasks |
 
@@ -136,7 +136,7 @@ Note: All syslog-auto entries route directly to GPUs with `api_key: not-needed`.
 - syslog-auto → qwen → gemma → qwen3.6-35B-udq4
 
 ### Why Strix Halo RPM Is Capped
-- Direct (strix-moe): 40 RPM (tight) — Strix Halo handles agent reasoning + compression via syslog-auto pool
+- Direct (strix-moe): 40 RPM (tight) — Strix Halo is shared with compression tasks
 - Via syslog-auto: 60 RPM (moderate) — prevents flooding when multiple agents use syslog-auto simultaneously
 - Combined max: ~100 RPM across both paths — Strix Halo can sustain this at 80°C
 
@@ -284,7 +284,7 @@ History stored at `/root/data/toks-history.json` with 7-day rolling window.
 ### Stable Aliases — CRITICAL
 
 All agent configs MUST use stable role-based aliases, never model-specific names:
-- `compression.model: syslog-auto` — switched from strix-moe 2026-07-18 to distribute across weighted pool (55% RTX 3090, 30% Strix Halo, 15% RTX 5070); relieves Strix Halo thermal pressure
+- `compression.model: strix-moe` (NOT `qwen3.6-35B-udq4`)
 - `auxiliary.vision.model: gpu-light` (NOT `gemma-4-12b`)
 - `delegation.model: gpu-dense` (NOT `qwen3.6-27B-code`)
 - `auxiliary.web_extract.model: gpu-light`
@@ -295,7 +295,7 @@ When the underlying model is swapped, only the LiteLLM config changes — agent
 - RTX 3090: **128K** (reduced from 256K 2026-07-17) | RTX 5070: **128K** (reduced from 256K) | Strix Halo: **128K**
 - **All agents**: 128K ceiling — stable margin. For >128K workloads, use external providers (deepseek)
 - Compression threshold 0.65: fires at ~85K (~43K headroom before 128K ceiling)
-- Mumuni compression model alias: `syslog-auto` (switched from strix-moe 2026-07-18) with 300s timeout
+- Mumuni compression model alias: `strix-moe` with 300s timeout
 
 ### Mumuni Agent Profile
 
@@ -305,8 +305,8 @@ Mumuni (CT114, 192.168.68.123) is the primary business assistant. This profile i
 |---------|-------|-------|
 | `model.default` | `syslog-auto` | Weighted pool (55% qwen, 30% strix, 15% gemma) |
 | `model.provider` | `custom:litellm` | LiteLLM on CT116 |
-| `compression.model` | `syslog-auto` | Switched from strix-moe 2026-07-18 — distributes across weighted pool |
-| `aux.compression.model` | `syslog-auto` | Compression auxiliary — switched from strix-moe 2026-07-18 |
+| `compression.model` | `strix-moe` | Stable alias — survives model swaps |
+| `aux.compression.model` | `strix-moe` | Compression auxiliary model |
 | `aux.vision.model` | `gpu-light` | Vision tasks (RTX 5070) |
 | `aux.web_extract.model` | `gpu-light` | Web extraction |
 | `delegation.model` | `gpu-dense` | Sub-agent reasoning (RTX 3090) |
@@ -318,7 +318,7 @@ Mumuni (CT114, 192.168.68.123) is the primary business assistant. This profile i
 | `personalities` | `creative` | Creative assistant personality |
 | Platforms | cli, discord, homeassistant, signal, telegram, zulip | All Hermes platforms |
 | Main model timeout | 300s | LiteLLM global timeout |
-| Compression model timeout | 300s | syslog-auto timeout (switched from strix-moe 2026-07-18) |
+| Compression model timeout | 300s | strix-moe timeout increased from 120s |
 
 ### Agent Update Status (2026-07-15)
 

gpu-self-heal.prose.md

@@ -46,7 +46,7 @@ depends_on:
 |-------|-----|------|-------|------|-----|-------|------|
 | `gpu-dense` | RTX 3090 24GB | ct8 (.8:8080) | ThinkingCap Qwen3.6-27B Q4_K_M + MTP + vision | 21.6/24.6GB (88%) | 128K | 74.9 | Heavy reasoning, code gen |
 | `gpu-light` | RTX 5070 12GB | ct110 (.110:8080) | HauhauCS Gemma4-12B QAT Q4_K_M + MTP draft | 10.1/12.2GB (83%) | 128K | 169.6 | Vision, web extract, light tasks |
-| `strix-moe` | Strix Halo 64GB | ct15 (.15:8080) | Genesis Hermes V3 APEX (LuffyTheFox, 24GB) | ~10/64GB (16%) | 128K | 62.9 | Agent reasoning, compression (~30% via syslog-auto pool), summarization, long docs |
+| `strix-moe` | Strix Halo 64GB | ct15 (.15:8080) | Genesis Hermes V3 APEX (LuffyTheFox, 24GB) | ~10/64GB (16%) | 128K | 62.9 | Compression, summarization, long docs |
 
 Key notes:
 - All models use direct GPU routing via LiteLLM (`api_key: not-needed`). Router (port 9000) is deprecated and NOT in the inference path.
@@ -157,7 +157,7 @@ Key notes:
 - **Target distribution**:
   - RTX 3090 (gpu-dense, 24GB, 74.9 tok/s) → Heavy reasoning, code gen, long conversations (slowest per-token but largest context capacity). Weight: 0.55 (LiteLLM).
   - RTX 5070 (gpu-light, 12GB, 169.6 tok/s) → Vision/image, web search, lightweight tasks (2.3x faster than 3090 per token). Weight: 0.15 (LiteLLM).
-  - Strix Halo (strix-moe, 64GB, 62.9 tok/s) → Agent reasoning, compression (~30% via syslog-auto pool), summarization, long docs (MoE model). Weight: 0.30 (LiteLLM).
+  - Strix Halo (strix-moe, 64GB, 62.9 tok/s) → Context compression, summarization, long docs (MoE model). Weight: 0.30 (LiteLLM).
 - **Note**: RTX 5070 is the fastest endpoint per token. Route high-volume, low-complexity work there first.
 - **Fix**:
   - Alert if any GPU is handling workload outside its designated role

hermes-agent-baseline.prose.md

@@ -5,7 +5,7 @@ version: 1.0.0
 description: >
   Canonical known-good baseline for all Syslog Hermes agents. Captures the exact
   configuration state, keys, workarounds, and audit procedure. When an agent's
-  configuration goes sideways, restore from this baseline. Last verified 2026-07-16. All GPUs 128K context (RTX 3090 .8, RTX 5070 .110, Strix Halo .15). Parallel 1 fleet-wide (compression via syslog-auto pool — switched from strix-moe 2026-07-18).
+  configuration goes sideways, restore from this baseline. Last verified 2026-07-16. All GPUs 256K context (RTX 3090 .8, RTX 5070 .110, Strix Halo .15). Parallel 1 fleet-wide (Strix Halo handles compression solo).
 author: Abiba (pi agent)
 ---
 

hermes-config-template.prose.md

@@ -272,7 +272,7 @@ The following MUST be identical across ALL profiles:
 ### Rule 8: GPU Workload Distribution (UPDATED 2026-07-18)
 - **RTX 3090 (24GB, 128K ctx, qwen3.6-27B-code)**: Heavy reasoning, code gen, long conversations — also handles ~55% of compression via syslog-auto pool
 - **RTX 5070 (12GB, 128K ctx, gemma-4-12b)**: Vision, web search, quick tasks, web_extract — handles ~15% of compression via syslog-auto pool
-- **Strix Halo (64GB, 128K ctx, Genesis Hermes V3 APEX)**: Agent reasoning, compression (~30% via syslog-auto pool), fallback for other GPUs
+- **Strix Halo (64GB, 128K ctx, Geneis Hermes V3 APEX)**: Agent reasoning, compression (~30% via syslog-auto pool), fallback for other GPUs
 - Agent profiles MUST route auxiliary tasks to the correct GPU:
   - `auxiliary.vision.model: gpu-light` (RTX 5070)
   - `auxiliary.web_extract.model: gpu-light` (RTX 5070)

inference-optimization.prose.md

@@ -57,7 +57,7 @@ duration.
 prefill time at 532 tok/s. Fix context first, routing second.
 
 - **Route by task**: ornith for multi-step reasoning only; qwen for code/standard
-  queries; gemma for vision/web extraction; syslog-auto for compression (via weighted pool). Never send simple completion to a
+  queries; gemma for compression/auxiliary. Never send simple completion to a
   35B MoE.
 - **Compress aggressively**: threshold at 40% (not 65%) — a 256K window should
   compact at 102K, not 166K. Target 15% tail (not 30%).

infrastructure-maintenance.prose.md

@@ -0,0 +1,200 @@
+---
+kind: responsibility
+name: infrastructure-maintenance
+description: >
+  Weekly system-level maintenance for the Syslog inference fleet: OS package
+  updates on the primary host, Docker image pulls for LiteLLM/SearXNG and other
+  running containers, container restarts with health verification, post-update
+  verification of every critical service (LiteLLM proxy, SearXNG, Zulip, Gitea,
+  PM2 processes, Hermes gateways), and rollback on failure. Consolidates the
+  raw shell scripts that previously did this piecemeal. This contract owns the
+  HOST-LEVEL weekly maintenance loop on the primary host plus Docker image
+  pulls ONLY for .116 and .7, while infrastructure-update owns the FULL-FLEET
+  cluster-wide wave (apt across the full PVE cluster + CTs/VMs AND its Docker
+  image Wave 3 across all stacks). Runs Sunday 2am ET. Owner:
+  ops (firstmate secondmate). Blast radius: an unverified image pull can break
+  LiteLLM (all agents lose inference) or SearXNG (search-stack down); a bad apt
+  upgrade can leave the host in a half-upgraded state. Pre-update backup check
+  and rollback are mandatory for this reason.
+agent: ops
+triggers:
+  - weekly (Sunday 02:00 ET) via cron
+  - on demand when ops/abiba triggers "infra maintenance"
+version: 1.0.0
+---
+
+## Maintains
+
+- maintenance-status: { phase: idle|preflight|apt|images|restarts|verify|rollback|done|failed, host, step, result, timestamp }
+- image-baseline: { service, current_tag, pulled_tag, digest, updated_at } — last known-good image per container
+- apt-state: { upgradable_before, upgradable_after, held_broken, kernel_reboot_required }
+- health-baseline: snapshot of critical-service health captured pre-update (used for regression check post-update)
+- rollback-snapshot: { backup_path, configs, image_digests, timestamp } — restore point created in preflight
+- maintenance-history: array of past runs with phase results and any escalations
+
+## Scope
+
+Primary host is the maintenance host where apt updates apply. Docker image pulls
+span the two Docker ecosystems that run critical services. infrastructure-update
+runs the full-fleet cluster-wide wave (including its Wave 3 Docker pulls across
+all stacks/hosts); this contract runs a narrower host-level weekly pull limited
+to .116 and .7. Topology, CT IDs, and IPs are live-state fields — verify against
+`infrastructure-control.prose.md` (the source of truth) and the live system
+before mutating.
+
+| Host | IP | Role | Trust |
+|------|----|------|-------|
+| CT 116 (syslog-api) | 192.168.68.116 | LiteLLM proxy + Grafana + Prometheus (inference harness) | ⚠️ VERIFY-BEFORE-USE |
+| VM 109 (docker-vm) | 192.168.68.7 | SearXNG + Firecrawl + home stack (Docker host) | ⚠️ VERIFY-BEFORE-USE |
+| CT 117 (zulip) | 192.168.68.19 | Zulip (storepve bridge IP .19) | ⚠️ VERIFY-BEFORE-USE |
+| Gitea | https://git.sysloggh.net | Prose-contracts + agent configs source control | ⚠️ VERIFY-BEFORE-USE |
+| CT 100 (abiba/pi) | 192.168.68.24 | PM2 processes (pi agent harness) | ⚠️ VERIFY-BEFORE-USE |
+
+> "Primary host" for the apt phase is the host the ops agent runs maintenance
+> from. Confirm which host that is against infrastructure-control before
+> running; do not assume. If the ops agent is containerized/CT-based, apt runs
+> inside that CT.
+
+## Requires
+
+- SSH/exec access to CT 116 (.116) and VM 109 (.7) for Docker operations
+- `apt`, `docker`, `docker compose` available on target hosts
+- LiteLLM master key available (Infisical vault, `LITELLM_API_KEY`) for health verification
+- `infrastructure-monitoring` run completed within the last 30 minutes — provides the pre-update health baseline used by the regression check
+- Writable backup directory `/tmp/infra-maintenance-backup-<date>/` on each mutated host
+- Proxmox snapshot of the primary host available (or confirmed not required) before apt phase
+
+## Continuity
+
+- Self-driven: weekly cron `0 2 * * 0` (Sunday 02:00 ET)
+- Also wakes on: explicit "infra maintenance" trigger from ops/abiba
+- Depends on `infrastructure-monitoring` for the pre-update health baseline — do not run if the last monitoring run is stale (>30 min) or RED; abort and escalate instead
+
+## Execution
+
+### Phase 0 — Preflight (snapshot/backup check + health baseline)
+
+1. **Capture health baseline** — run the `infrastructure-monitoring` postcondition checks (LiteLLM, Zulip, Gitea, SearXNG, Proxmox API) and record results as `health-baseline`. If any critical service is already down, **abort**: maintenance must not run on a degraded fleet.
+2. **Backup check** — confirm a Proxmox snapshot of the primary host exists OR `/tmp/infra-maintenance-backup-<date>/` was created this run. Snapshot critical config files into the backup dir:
+   - `/opt/inference-harness/docker-compose.yml`, `/opt/inference-harness/litellm_config.yaml` (CT 116)
+   - `/opt/search-stack/searxng/docker-compose.yml`, `/opt/search-stack/firecrawl-source/docker-compose.yaml` (VM 109)
+3. **Record image baseline** — `docker inspect --format '{{.Image}} {{.Config.Image}}' <container>` for every running container on .116 and .7; store digests in `image-baseline` so rollback can restore them.
+4. **Disk check** — `df -h` on each mutated host; abort if free space <20% (apt upgrade + image pulls need headroom).
+
+### Phase 1 — OS package updates (primary host)
+
+```bash
+# On the primary host only (VERIFY host against infrastructure-control first)
+apt update
+apt upgrade -y
+```
+
+- Capture `apt list --upgradable` before and after → store in `apt-state`.
+- If apt reports held/broken packages (`apt-get -s upgrade | grep -i broken`, or non-zero exit), **stop** — do not force. Record `held_broken` and go to rollback/escalate.
+- If `/var/run/reboot-required` exists after upgrade, flag `kernel_reboot_required: true` in `apt-state` but **do not reboot automatically** — that's a separate coordinated action (see infra-update Wave 4). Note it in the report.
+
+### Phase 2 — Docker image pulls
+
+Pull latest stable tags for every running container. Do NOT pin to `:main`/`:nightly` — use stable tags where the compose file specifies them; otherwise `latest`.
+
+```bash
+# CT 116 (.116) — inference harness
+cd /opt/inference-harness && docker compose pull
+
+# VM 109 (.7) — search + home stacks
+cd /opt/search-stack/searxng && docker compose pull
+cd /opt/search-stack/firecrawl-source && docker compose pull
+# any other running stacks on .7 (home stack, audiobookshelf) — pull per their compose files
+```
+
+- LiteLLM and SearXNG are the two explicitly required pulls; "any other running containers" means every stack with a compose file on .116 and .7.
+- Record pulled tag + digest per service in `image-baseline`.
+
+### Phase 3 — Container restarts with health verification
+
+Restart one stack at a time, verify health before moving to the next. Do not restart everything at once — a failure mid-wave must leave the rest running.
+
+```bash
+# CT 116
+cd /opt/inference-harness && docker compose up -d
+# VM 109
+cd /opt/search-stack/searxng && docker compose up -d
+cd /opt/search-stack/firecrawl-source && docker compose up -d
+```
+
+After each stack comes up, wait for health (max 120s):
+- `docker ps` shows the container `Up` (and `healthy` if a healthcheck is defined)
+- Service-specific probe passes (see Phase 4 probes)
+
+If a stack fails to come up within 120s, **stop the wave** and go to rollback for that stack only; do not proceed to the next.
+
+### Phase 4 — Post-update service verification
+
+After ALL updates (apt + images + restarts), verify every critical service is back up and matches the pre-update baseline. This is the regression gate.
+
+| Service | Probe | Expect |
+|---------|-------|--------|
+| LiteLLM proxy | `curl -sf http://192.168.68.116/litellm/v1/models` | 200 OK, models returned |
+| LiteLLM MCP gateway | `curl -sf http://192.168.68.116:4000/mcp-rest/tools/list -H "Authorization: Bearer $MASTER_KEY"` | 90 tools (23 RA-H OS + 67 GitHub) |
+| SearXNG | `curl -sf http://192.168.68.7:8888` | 200 OK |
+| Zulip | `curl -sf https://chat.sysloggh.net/api/v1/server_settings` | 200 OK |
+| Gitea | `curl -sf https://git.sysloggh.net/api/v1/version` | 200 OK |
+| PM2 processes | `pm2 jlist` (CT 100) | all pi-agent processes `online` |
+| Hermes gateways | SSH to Mumuni CT 114, Tanko CT 112; `systemctl is-active hermes-gateway` | `active` for each |
+
+Regression check: every service that was GREEN in `health-baseline` must still be GREEN. A service that was already RED (and caused a preflight abort) is excluded — but Phase 0 should have aborted before we got here.
+
+## Rollback Protocol
+
+If ANY service in Phase 4 fails to come back up (or regresses vs baseline):
+
+1. **Image rollback** — for the failing stack, restore the previous image:
+   ```bash
+   # Restore from recorded image-baseline digest
+   docker compose down
+   # Pin the service image to the recorded digest in compose, then recreate
+   #   image: <name>@sha256:<previous_digest>
+   docker compose pull && docker compose up -d
+   ```
+2. **APT rollback** — restore the primary host from the Proxmox snapshot taken/confirmed in Phase 0. If no snapshot, `apt install <pkg>=<old_version>` per package using apt history (`/var/log/apt/history.log`).
+3. **Config rollback** — restore configs from `/tmp/infra-maintenance-backup-<date>/`.
+4. **Re-verify** — re-run the Phase 4 probes on the rolled-back service. If still failing, escalate (do not loop — circuit breaker below).
+5. **Escalate** — send a Zulip DM to abiba + mumuni with: failing service, phase, baseline vs current, rollback actions taken, backup path.
+
+## Circuit Breaker
+
+- `max_retries: 2` per failing phase — after 2 rollback attempts on the same service, stop and escalate.
+- `window: 7200` seconds — no more than 2 retries within a 2-hour window.
+- `trip_action: escalate_to_fatal` — when tripped, escalate to fatal (abiba + mumuni + kwame) and pause; a human must clear before the next scheduled run.
+
+## Report
+
+After completion (or on abort), emit a receipt (JSON) to `~/.hermes/runs/infrastructure-maintenance/` and send a Zulip DM summary:
+
+```
+🛠 Infrastructure Maintenance — YYYY-MM-DD
+
+Phase: apt | images | restarts | verify | rollback
+Primary host: <host>
+APT: <N> packages upgraded, <M> held/broken, kernel_reboot_required=<bool>
+Images pulled: LiteLLM <tag>, SearXNG <tag>, <others>
+Services: all GREEN | <service> FAILED (rolled back)
+Baseline regression: none | <details>
+Backup: /tmp/infra-maintenance-backup-YYYYMMDD/
+Escalation: none | warning | critical | fatal
+```
+
+## Verification Postconditions
+
+- All critical services running after update (Phase 4 all GREEN)
+- No regressions from pre-update health baseline (Phase 0 baseline)
+- Docker containers on latest stable tags (`image-baseline.pulled_tag` recorded)
+- APT packages up to date with no held broken packages (`apt-state.held_broken == 0`)
+
+## Related Contracts
+
+- `infrastructure-update.prose.md` — owns the full-fleet cluster-wide wave INCLUDING its Wave 3 Docker image updates across all stacks (SearXNG, Firecrawl, Inference Harness on .116, home stack, audiobookshelf); infrastructure-maintenance is a deliberately narrower host-level weekly pull scoped to .116 and .7.
+- `infrastructure-monitoring.prose.md` — provides the pre-update health baseline (depends_on).
+- `infrastructure-control.prose.md` — topology source of truth (CT IDs, IPs, hostnames).
+- `litellm-health.prose.md` — LiteLLM probe details.
+- `proxmox-monitor.prose.md` — Docker stats + monitoring stack health.