feat: per-model throughput (tok/s) tracking + metrics endpoint

New throughput-store extension records one token-weighted sample per turn
(model, output tokens, pure generation time = Σ step genTotalMs) into a
day-bucketed KV store, and aggregates per-model tok/s = Σtokens / Σgen-seconds
over a day/week/month (server-local boundaries; week = ISO Mon–Sun).

transport-http records a sample per turn (logged) and serves
GET /metrics/throughput?period=day|week|month&date=<...>. The response is typed
as transport-contract's ThroughputResponse, so store/wire drift is a compile
error. Pure period + aggregate logic fully unit-tested.

1 files changed, 13 insertions, 2 deletions

diff --git a/bun.lock b/bun.lock
index bc33ba7..5911ffd 100644
--- a/bun.lock
+++ b/bun.lock
@@ -54,6 +54,7 @@
         "@dispatch/storage-sqlite": "workspace:*",
         "@dispatch/surface-loaded-extensions": "workspace:*",
         "@dispatch/surface-registry": "workspace:*",
+        "@dispatch/throughput-store": "workspace:*",
         "@dispatch/tool-read-file": "workspace:*",
         "@dispatch/transport-http": "workspace:*",
         "@dispatch/transport-ws": "workspace:*",
@@ -122,6 +123,13 @@
         "@dispatch/ui-contract": "workspace:*",
       },
     },
+    "packages/throughput-store": {
+      "name": "@dispatch/throughput-store",
+      "version": "0.0.0",
+      "dependencies": {
+        "@dispatch/kernel": "workspace:*",
+      },
+    },
     "packages/tool-read-file": {
       "name": "@dispatch/tool-read-file",
       "version": "0.0.0",
@@ -142,7 +150,7 @@
     },
     "packages/transport-contract": {
       "name": "@dispatch/transport-contract",
-      "version": "0.1.0",
+      "version": "0.4.0",
       "dependencies": {
         "@dispatch/ui-contract": "workspace:*",
         "@dispatch/wire": "workspace:*",
@@ -156,6 +164,7 @@
         "@dispatch/credential-store": "workspace:*",
         "@dispatch/kernel": "workspace:*",
         "@dispatch/session-orchestrator": "workspace:*",
+        "@dispatch/throughput-store": "workspace:*",
         "@dispatch/transport-contract": "workspace:*",
         "hono": "^4.0.0",
       },
@@ -177,7 +186,7 @@
     },
     "packages/wire": {
       "name": "@dispatch/wire",
-      "version": "0.1.0",
+      "version": "0.4.0",
     },
   },
   "packages": {
@@ -225,6 +234,8 @@
 
     "@dispatch/surface-registry": ["@dispatch/surface-registry@workspace:packages/surface-registry"],
 
+    "@dispatch/throughput-store": ["@dispatch/throughput-store@workspace:packages/throughput-store"],
+
     "@dispatch/tool-read-file": ["@dispatch/tool-read-file@workspace:packages/tool-read-file"],
 
     "@dispatch/trace-replay": ["@dispatch/trace-replay@workspace:packages/trace-replay"],