collab-stack: import collab stack with local repairs

Start from the pinned `origin/dev/friel/collab-stack` snapshot and fold in the
local follow-up repairs that made that imported stack usable here: watchdog
spawn/registration plumbing, deferred-tool fallback behavior, collab discovery
fixture alignment, schema mirroring, and subagent-panel fixes.

Original imported source:
- source ref: `refs/remotes/origin/dev/friel/collab-stack`
- source tip: `599ed9dc05eafd116192184bd54a2a55a2c49366`
- original base: `c1d18ceb6f22ae3acd67bbd6badad0f475b31dfc`

.github/workflows/bazel.yml

@@ -131,7 +131,7 @@ jobs:
           key: ${{ steps.prepare_bazel.outputs.repository-cache-key }}
 
   clippy:
-    timeout-minutes: 30
+    timeout-minutes: 60
     strategy:
       fail-fast: false
       matrix:

.github/workflows/rust-ci.yml

@@ -82,7 +82,6 @@ jobs:
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2
         with:
           tool: cargo-shear
-          version: 1.5.1
       - name: cargo shear
         run: cargo shear
 
@@ -145,10 +144,10 @@ jobs:
         include:
           - name: Linux
             runner: ubuntu-24.04
-            timeout_minutes: 30
+            timeout_minutes: 120
           - name: macOS
             runner: macos-15-xlarge
-            timeout_minutes: 30
+            timeout_minutes: 90
           - name: Windows
             runner: windows-x64
             timeout_minutes: 30

.github/workflows/sdk.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on:
       group: codex-runners
       labels: codex-linux-x64
-    timeout-minutes: 10
+    timeout-minutes: 60
     steps:
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6