feat(hybrid-gateway): integrate muse-cli with Cloudflare netns isolation, symmetric sidechat routing, and 646-pip sync unblock

2026-10-04 22:54:01 +00:00
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+# Per-Node Rate Limit Policy (2026-10-04)
+
+## Why
+
+All 4 fleet nodes (muse, pip, 646, opm) egress from a single Cloudflare IP
+(`104.28.195.181`). Cloudflare therefore sees the whole fleet as one client.
+When fleet timers fire simultaneously, synchronized send bursts look like one
+aggressive client and invite correlated rate-limiting — the likely shape of
+the "all 4 browsers flapping" episodes.
+
+Per-agent rate limiting with deterministic jitter de-correlates the fleet:
+each node's send phase drifts apart instead of hitting in lockstep.
+
+## Policy
+
+| Agent | Base interval | Jitter factor | Effective interval | Burst | Max/min |
+|---|---|---|---|---|---|
+| muse | 3.0s | 1.2917 | 3.875s | 5 | 20 |
+| pip  | 3.0s | 0.8183 | 2.455s | 5 | 20 |
+| 646  | 3.0s | 1.1193 | 3.358s | 5 | 20 |
+| opm  | 3.0s | 0.8287 | 2.486s | 5 | 20 |
+
+Mean effective interval ≈ 3.04s — the jitter does **not** make limits
+stricter on average; it only spreads phases.
+
+- **Jitter:** ±30% deterministic per agent, seeded by
+  `sha256("netvm-rate-jitter:v1:" + agent)`. Same agent → same factor every
+  run (reproducible); different agents → different factors (de-correlated).
+  Uses an isolated `random.Random`, never touches global random state.
+- **Scope:** per-agent token buckets. State lives in one shared file
+  (`/tmp/netvm-rate-limit.json`) but keys are namespaced by agent
+  (`{agent}`, `{agent}_recent`) — buckets are fully independent.
+- **Enforcement points:**
+  - `job-dispatch.py` — `rate_limit_wait(agent)` / `rate_limit_wait(sender_agent)`
+    (pre-existing; now jittered, no call-site change needed)
+  - `dm.py::dm_send` — `rate_limit_wait(agent)` before send, keyed on the
+    sender (added 2026-10-04). Near no-op at normal pacing since sends
+    already sleep 2–3s; it only bites on burst loops.
+
+## Inspect
+
+```bash
+python3 bin/rate_limiter.py --policy            # effective policy per agent
+python3 bin/rate_limiter.py --policy opm --no-jitter
+```
+
+## Notes
+
+- `/tmp` state does not survive reboots; buckets start empty (permissive).
+- To disable jitter for a caller: `rate_limit_wait(agent, jitter=0)`.
+- Distinct egress IPs per node (Cloudflare Zero Trust dedicated egress)
+  remains the structural fix; this policy is the de-correlation layer that
+  works regardless.