docs(1.1): RAM footprint analysis + release plan

Fleet resident set ~2.57GB across 18 workers; ~1.5GB is the 86MB import
floor paid 18x. Pinned root cause: topology/__init__ eager re-export of
generate drags the full SQLModel ORM (26 tables, ~38MB) into every worker.

deploy/tmpfiles.d/decnet.conf.j2

@@ -0,0 +1,4 @@
+# /run/decnet hosts bus.sock (UDS, 0660, group={{ group }}).
+# tmpfiles.d recreates it on every boot before any decnet-*.service starts,
+# so the bus worker never silently falls back to ~/.decnet/bus.sock.
+d /run/decnet 0755 root {{ group }} -

development/RELEASE-1.1.md

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+# DECNET 1.1 — RAM / Process-Footprint Release
+
+Predecessor: `v1.0.0`. Theme: cut the fleet resident set from **2.57 GB → target ~1.3 GB**
+with near-zero risk, then optionally further via worker consolidation.
+
+Analysis & measurements: see [improvements.md](improvements.md).
+
+## Why
+
+18 long-running workers, ~2.57 GB resident. ~1.5 GB of that is the **same 86 MB import
+floor paid 18×**, not workload. The floor is `import decnet.cli` pulling the entire
+SQLModel ORM + all 26 model tables into every worker, even ones that never touch the DB.
+
+## Root cause (pinned)
+
+```
+cli/__init__.py:22  from . import (... topology ...)
+ → cli/topology.py:12        from decnet.topology.config import TopologyConfig
+   → decnet/topology/__init__.py:10   from decnet.topology.generator import generate   ← TRIGGER
+     → generator → allocator → repository → web.db.models.topology → all 26 tables (~38 MB)
+```
+
+The `topology/__init__.py` eager re-export of `generate` is the single thread that drags
+the ORM into every worker. No production code imports `generate` from the package surface
+(only tests, and they import the `compose` submodule) — safe to make lazy.
+
+## Commit plan (incremental, one concern each)
+
+- [x] **C1 — docs.** `improvements.md` (analysis) + this release plan.
+- [ ] **C2 — lazy topology re-export.** PEP 562 `__getattr__` in `topology/__init__.py`
+      so `generate` loads on access, not on package import. Public API unchanged.
+      Test: `import decnet.cli` must NOT pull `decnet.web.db.models`. Re-measure floor.
+- [ ] **C3 — sweep remaining eager model pulls.** After C2, re-trace `import decnet.cli`;
+      defer any other command module that drags the ORM in for registration only.
+      Test: assert idle-worker floor stays under target.
+- [ ] **C4 — extract idle-herd coroutines.** Hoist the inline `_run()` closures
+      (`webhook`, `canary`, `listener`, `forwarder`, `mutate`, `enrich`) into reusable
+      `async def run(bus, cfg)` in their packages, so they're hostable by a supervisor.
+      CLI commands become thin `asyncio.run(run(...))` wrappers. No behaviour change.
+- [ ] **C5 — `decnet supervise`.** TaskGroup supervisor hosting the idle herd in one
+      process; reuses existing bus + `system.{worker}.control` shutdown. One systemd unit
+      replacing ~8. `# ponytail: shared event loop — split a worker back out if it needs
+      its own restart policy / MemoryMax`.
+- [ ] **C6 — merge scapy workers.** Optional. `collect`/`probe`/`sniffer` share the 76 MB
+      scapy import once instead of 3×.
+
+## Scope boundaries (no creep)
+
+- **In:** import-floor reduction (C2–C3), idle-herd consolidation (C4–C5), scapy merge (C6).
+- **Out:** `bus` (broker — stays alone), `api`/`web` (already multiprocess), `profiler`/`ttp`
+  (heavy resident state + real CPU — stay separate). Not touching DB schema, bus wire format,
+  or worker logic — only *where* code is imported and *which process* hosts it.
+
+## Risk ladder
+
+- C2–C3: import-site only, reversible, covered by an import-floor test. **Low.**
+- C4: pure extraction, behaviour-preserving, existing tests guard it. **Low.**
+- C5: introduces **shared fate** — one crash/OOM takes the herd; loses per-worker systemd
+  restart + `MemoryMax`. **Medium.** Verify on the live fleet before adopting; keep the
+  individual units as the fallback. Do C2–C4 first; C5 only if RAM still bites.
+
+## Projected
+
+- C2–C3 (import floor): 2.57 GB → **~1.3 GB**. Nearly free.
+- C4–C6 (consolidation): → **~0.9 GB**. Costs process isolation.

development/improvements.md

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+# DECNET RAM / Process-Footprint Improvements
+
+Status: analysis complete, implementation not started.
+Measured 2026-06-17 on the dev box, 18 live `decnet` workers, CPython 3.11 (`.311`).
+
+## Headline
+
+Fleet resident set ≈ **2.57 GB across 18 processes**. The bulk is not workload —
+it is the same import floor paid 18 times over.
+
+## Part A — the universal import tax (measured)
+
+Every worker pays **~86 MB at startup before doing any work**:
+
+```
+interpreter            12 MB
++ import decnet.cli    74 MB   ← SQLModel/SQLAlchemy/Pydantic (~32MB)
+                                 + EVERY decnet.web.db.models.* table
+                                 + decnet.config + decnet.models
+= floor                86 MB   paid 18× ≈ 1.5 GB of the 2.57 GB total
+```
+
+Measured cold, fresh interpreter each time (RSS):
+
+| Layer | Resident | Who pays |
+|---|---:|---|
+| CPython interpreter | ~12 MB | everyone (shared COW) |
+| `import decnet.cli` | +74 MB | **every worker** |
+| └ SQLModel/SQLAlchemy/Pydantic | ~32 MB | the ORM chain |
+| └ all `decnet.web.db.models.*` tables | ~20 MB | eagerly imported |
+| `scapy.all` | +76 MB | only `collect`, `probe`, `sniffer` |
+
+Confirmed NOT in the universal path:
+- **scapy** — `scapy loaded after import decnet.cli? False`. Only the sniff/probe workers pay it.
+- **pandas / numpy / sklearn** — no module-scope imports anywhere; already lazy-imported
+  inside the functions that use them. Codebase got this right; leave it.
+
+### Root cause
+
+`decnet/cli/__init__.py:22-48` eagerly does `from . import (agent, api, ... ttp)` —
+all 26 command modules imported at process start. Each pulls `decnet.config` +
+`decnet.models` + the `decnet.web.db.models.*` chain at module top. So `decnet canary`
+(which never touches TTP/swarm/webhook tables) still parses every table's SQLModel
+metaclass.
+
+importtime top offenders (pure model-table import cost, self time):
+```
+decnet.web.db.models.topology    21ms
+decnet.web.db.models.attackers   15ms
+decnet.models                    13ms
+decnet.web.db.models.logs        11ms
+... canary, ttp, swarm, auth, webhooks, orchestrator ...
+```
+
+## Part B — architecture map (for consolidation)
+
+All 18 workers are **already asyncio coroutines subscribing to one shared UNIX-socket
+bus** (`decnet/bus/`), with a `system.{worker}.control` shutdown topic already wired and a
+`system.{worker}.health` heartbeat every 10s. They are already independent tasks — nothing
+needs re-architecting, only re-hosting.
+
+| Tier | Workers | Verdict |
+|---|---|---|
+| Broker | `bus` | Stays alone — it's the hub. |
+| Already multiprocess by design | `api`/uvicorn, `web` (ThreadingTCPServer) | Leave them. |
+| scapy + blocking sniff threads | `collect`, `probe`, `sniffer` | Keep out of main loop (76 MB scapy + GIL-thrashing threads). **Merge these 3** → pay scapy once. |
+| Heavy resident state / CPU | `profiler` (353 MB), `ttp` (308 MB) | Keep separate — big live heaps, real CPU work; co-locating serializes them under GIL. |
+| **The idle herd** ⭐ | `webhook`, `canary`, `listener`, `forwarder`, `mutate`, `orchestrator`, `reconciler`, `enrich`, + lighter clusterers | **The prize.** ~10 mostly-idle event-driven tasks each paying the 86 MB floor to `await` a bus event. Collapse into ONE supervisor. |
+
+Loop-type evidence (from architecture map):
+
+| Worker | Loop entry | Loop kind |
+|---|---|---|
+| bus | `cli/bus.py:10` → `bus/worker.py:44` | asyncio serve_forever + heartbeat |
+| profiler | `cli/profiler.py:10` → `:33` | asyncio, 30s wakeup, batch 500 logs |
+| ttp | `cli/ttp.py:46` → `:80` | asyncio queue pump on `attacker.observation.*` |
+| clusterer | `cli/workers.py:260` → `:304` | bus-woken on `attacker.observed` |
+| campaign-clusterer | `cli/workers.py:308` → `:362` | bus-woken on `identity.>` |
+| web | `cli/web.py:27` → `:148` | ThreadingTCPServer.serve_forever (blocking) |
+| api | `cli/api.py:18` → `:37` | subprocess.Popen uvicorn |
+
+## Recommendation — ordered, stop when RAM is fine
+
+### Step 1 — Lazy command registration (do first; safe, high-leverage)
+Smallest diff, zero new failure modes, helps with or without consolidation. Typer only
+needs a module imported to *run* a command, not to *register* it. Defer the
+`from . import (...)` so `decnet canary` loads canary's deps only, not all 26 tables.
+Reversible. Expected: idle workers drop well below the 86 MB floor.
+
+### Step 2 — Consolidate the idle herd (only if RAM still bites after step 1)
+`decnet supervise` runs the idle event-driven workers as tasks in ONE process — pay the
+floor 1× instead of ~10×. Plumbing already exists; the supervisor is ~10 lines:
+
+```python
+async with asyncio.TaskGroup() as tg:
+    for w in IDLE_WORKERS:
+        tg.create_task(w.run(bus))   # each already a bus-subscribed coroutine
+```
+
+**Cost to weigh:** consolidation trades RAM for **shared fate** — one crash takes down
+~10 workers, one OOM kills the herd, and you lose per-worker systemd restart policy and
+`MemoryMax=` caps. That's why step 1 comes first: free safety, and may make step 2
+unnecessary.
+
+### Step 3 — Merge the 3 scapy workers
+Share the 76 MB scapy import once instead of 3×.
+
+### Projected trajectory
+- 2.57 GB → **~1.3 GB** from lazy imports alone (nearly free)
+- → **~0.9 GB** if also consolidating the herd + merging scapy (costs isolation)
+
+The first 1.3 GB is nearly free; the last 400 MB costs you process isolation.