fix(git-tools): ci-queue-wait mishandles Gitea statuses:null — push guard hard-fails on any repo without CI

Gitea's combined-status endpoint returns statuses:null (not []) plus a
synthetic aggregate state of "pending" for a commit with zero status
contexts (captured live 2026-08-09). The bash parser called that payload
malformed -> ASSERTED_NOT_READY exit 3, blocking every push to a CI-less
repo; hit twice by velma on two independent clones (shared checkout +
fresh sparse clone), proving it environment-independent.

- treat statuses:null as empty (both .sh and .ps1)
- classify zero contexts as no-status BEFORE consulting the synthetic
  aggregate state (both twins; honoring it would poll to timeout)
- no-status on --purpose push without --require-status is now queue-clear
  exit 0 (a repo with no CI has no queue), mirroring record_cannot_assert
  dispositions (push=degraded-pass, merge=hold); merge + --require-status
  stay fail-closed at exit 3
- red-first regression harness test-ci-queue-wait-no-status.sh (5 cases,
  incl. the verbatim live Gitea payload and a genuine-pending guard);
  branch-absent harness still green

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_013SAYFkRhQfhguY7AHfiUC8

packages/mosaic/framework/tools/git/ci-queue-wait.ps1

@@ -85,10 +85,6 @@ function Get-QueueState {
         $state = "$($Payload.state)".ToLowerInvariant()
     }
 
-    if ($pending -contains $state) { return "pending" }
-    if ($failure -contains $state) { return "terminal-failure" }
-    if ($success -contains $state) { return "terminal-success" }
-
     $values = @()
     $statuses = @()
     if ($null -ne $Payload.statuses) { $statuses = @($Payload.statuses) }
@@ -101,7 +97,15 @@ function Get-QueueState {
         if (-not [string]::IsNullOrEmpty($v)) { $values += $v }
     }
 
-    if ($values.Count -eq 0 -and [string]::IsNullOrEmpty($state)) { return "no-status" }
+    # Zero contexts is classified FIRST: Gitea reports a synthetic aggregate
+    # state of "pending" alongside statuses:null / total_count:0 (a commit
+    # with no CI at all), and honoring that aggregate would poll to the
+    # timeout. With zero contexts there is nothing to wait on.
+    if ($values.Count -eq 0) { return "no-status" }
+
+    if ($pending -contains $state) { return "pending" }
+    if ($failure -contains $state) { return "terminal-failure" }
+    if ($success -contains $state) { return "terminal-success" }
     if (($values | Where-Object { $pending -contains $_ }).Count -gt 0) { return "pending" }
     if (($values | Where-Object { $failure -contains $_ }).Count -gt 0) { return "terminal-failure" }
     if ($values.Count -gt 0 -and ($values | Where-Object { -not ($success -contains $_) }).Count -eq 0) { return "terminal-success" }