fix(chat,channels): admin session delete, weixin inbound, PG and docs

- List/delete chat sessions for administrator by username (cross-tenant UUID)

- Return 404 when delete does not remove a session; add tests

- Weixin: dispatch lang, inbound attachments, reply persist, native reply timeout

- PG compat scrub and administrator session delete repo path

- RUNBOOK: WhatsApp re-bind with Remove-Item auth; weixin poll diag scripts

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/operations/scripts/weixin_install.ps1

@@ -15,7 +15,7 @@ $sidecarRoot = Join-Path $oclawRoot "data\\channel_sidecar\\$ChannelId"
 $stateDir = Join-Path $sidecarRoot "state"
 function Sync-WeixinBridgeRunners {
   $bridgeSrc = Join-Path $oclawRoot "runtime\\operations\\weixin_bridge"
-  foreach ($name in @("official_runner.ts", "login.ts")) {
+  foreach ($name in @("official_runner.ts", "login.ts", "poll_diag.ts")) {
     $srcPath = Join-Path $bridgeSrc $name
     if (-not (Test-Path $srcPath)) {
       throw "missing bridge source file: $srcPath"