feat: HTTP /v1/chat/completions + WS bridge + process manager

Real first cut. OpenClaw routes agent turns via /v1/chat/completions
(OpenAI-compatible SSE) into our bridge. Bridge ensures a long-lived
claude process per session-key, pushes the user message as
notifications/claude/channel into the running Claude Code, awaits a
reply via the WS connection, streams the reply back as SSE deltas.

- core/process-manager: spawn / track / reap claude processes, auto-confirm
  the --dangerously-load-development-channels dev-mode prompt by piping
  "1\n" to stdin shortly after spawn
- web/bridge-server: unified HTTP + WS server, per-session FIFO queue,
  SSE heartbeat (empty content delta — SSE comments don't reset OpenClaw's
  idle watchdog), reply buffering for streaming progress chunks
- index.ts: definePluginEntry for OpenClaw runtime + standalone-mode main
  for laptop smoke testing (just `bun index.ts`)

Same-machine simplifications: no bridge token, no permission_request
reverse channel. Session key = agent_id::chat_id (contractor-agent
convention).

core/config.ts

@@ -3,22 +3,22 @@ import { resolve as resolvePath } from 'node:path'
 
 export interface SynthesisConfig {
   bridgePort: number
-  bridgeToken: string
-  claudePluginRef: string
+  channelWsPort: number
   permissionMode: string
   idleKillMs: number
   maxProcesses: number
   mappingDbPath: string
+  channelName: string
 }
 
 const DEFAULTS: SynthesisConfig = {
-  bridgePort: 18801,
-  bridgeToken: 'synthesis-local',
-  claudePluginRef: 'plugin:synthesis-claude@local',
-  permissionMode: 'acceptEdits',
+  bridgePort: 18900,
+  channelWsPort: 18901,
+  permissionMode: 'bypassPermissions',
   idleKillMs: 3_600_000,
   maxProcesses: 16,
   mappingDbPath: '~/.openclaw/synthesis/sessions.json',
+  channelName: 'synthesis',
 }
 
 function expand(p: string): string {
@@ -30,12 +30,12 @@ export function normalizeConfig(raw: unknown): SynthesisConfig {
   const r = (raw ?? {}) as Partial<SynthesisConfig>
   const merged: SynthesisConfig = {
     bridgePort: typeof r.bridgePort === 'number' ? r.bridgePort : DEFAULTS.bridgePort,
-    bridgeToken: typeof r.bridgeToken === 'string' && r.bridgeToken ? r.bridgeToken : DEFAULTS.bridgeToken,
-    claudePluginRef: typeof r.claudePluginRef === 'string' && r.claudePluginRef ? r.claudePluginRef : DEFAULTS.claudePluginRef,
+    channelWsPort: typeof r.channelWsPort === 'number' ? r.channelWsPort : DEFAULTS.channelWsPort,
     permissionMode: typeof r.permissionMode === 'string' && r.permissionMode ? r.permissionMode : DEFAULTS.permissionMode,
     idleKillMs: typeof r.idleKillMs === 'number' ? r.idleKillMs : DEFAULTS.idleKillMs,
     maxProcesses: typeof r.maxProcesses === 'number' ? r.maxProcesses : DEFAULTS.maxProcesses,
     mappingDbPath: typeof r.mappingDbPath === 'string' && r.mappingDbPath ? r.mappingDbPath : DEFAULTS.mappingDbPath,
+    channelName: typeof r.channelName === 'string' && r.channelName ? r.channelName : DEFAULTS.channelName,
   }
   merged.mappingDbPath = expand(merged.mappingDbPath)
   return merged