feat(provider-umans): Umans AI Coding Plan provider + openai-stream lib

Extract a generic @dispatch/openai-stream library from provider-openai-compat
(convert-messages, convert-tools, parse-sse, listModels, stream, provider),
parameterizing createOpenAICompatProvider with uid=1000(tradam) gid=1000(tradam) groups=1000(tradam),966(docker),968(ollama),998(wheel) +  hook.
Refactor provider-openai-compat to import from the lib (byte-identical behavior).

New @dispatch/provider-umans extension wraps the Umans OpenAI-compatible backend
(https://api.code.umans.ai/v1). Self-contained: reads UMANS_API_KEY from env
directly (no auth-apikey dep). transformBody maps reasoningEffort →
reasoning_effort (capping xhigh/max → high). Dynamic listModels via GET /v1/models.

host-bin: registered provider-umans in CORE_EXTENSIONS + umans credential
(gated on UMANS_API_KEY — the credential is the model-catalog index).

Verified: tsc EXIT 0, 1059 vitest, biome clean (293 files). Boot smoke:
umans models appear in GET /models (7 models live).

1 files changed, 24 insertions, 0 deletions

diff --git a/bun.lock b/bun.lock
index 5716c6a..c08d7f9 100644
--- a/bun.lock
+++ b/bun.lock
@@ -61,7 +61,9 @@
         "@dispatch/journal-sink": "workspace:*",
         "@dispatch/kernel": "workspace:*",
         "@dispatch/lsp": "workspace:*",
+        "@dispatch/message-queue": "workspace:*",
         "@dispatch/provider-openai-compat": "workspace:*",
+        "@dispatch/provider-umans": "workspace:*",
         "@dispatch/session-orchestrator": "workspace:*",
         "@dispatch/skills": "workspace:*",
         "@dispatch/storage-sqlite": "workspace:*",
@@ -115,14 +117,32 @@
         "@dispatch/trace-store": "workspace:*",
       },
     },
+    "packages/openai-stream": {
+      "name": "@dispatch/openai-stream",
+      "version": "0.0.0",
+      "dependencies": {
+        "@dispatch/kernel": "workspace:*",
+        "@dispatch/trace-replay": "workspace:*",
+        "@dispatch/wire": "workspace:*",
+      },
+    },
     "packages/provider-openai-compat": {
       "name": "@dispatch/provider-openai-compat",
       "version": "0.0.0",
       "dependencies": {
         "@dispatch/kernel": "workspace:*",
+        "@dispatch/openai-stream": "workspace:*",
         "@dispatch/trace-replay": "workspace:*",
       },
     },
+    "packages/provider-umans": {
+      "name": "@dispatch/provider-umans",
+      "version": "0.0.0",
+      "dependencies": {
+        "@dispatch/kernel": "workspace:*",
+        "@dispatch/openai-stream": "workspace:*",
+      },
+    },
     "packages/session-orchestrator": {
       "name": "@dispatch/session-orchestrator",
       "version": "0.0.0",
@@ -301,8 +321,12 @@
 
     "@dispatch/observability-collector": ["@dispatch/observability-collector@workspace:packages/observability-collector"],
 
+    "@dispatch/openai-stream": ["@dispatch/openai-stream@workspace:packages/openai-stream"],
+
     "@dispatch/provider-openai-compat": ["@dispatch/provider-openai-compat@workspace:packages/provider-openai-compat"],
 
+    "@dispatch/provider-umans": ["@dispatch/provider-umans@workspace:packages/provider-umans"],
+
     "@dispatch/session-orchestrator": ["@dispatch/session-orchestrator@workspace:packages/session-orchestrator"],
 
     "@dispatch/skills": ["@dispatch/skills@workspace:packages/skills"],