[WIP] Add SpecBot workflow for code annotation with assertions (#8388)

* Initial plan

* Add SpecBot agentic workflow for automatic specification mining

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Fix SpecBot network configuration and add documentation

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

.github/workflows/specbot.md

@@ -0,0 +1,49 @@
+---
+description: Automatically annotate code with assertions capturing class invariants, pre-conditions, and post-conditions using LLM-based specification mining
+
+on:
+  schedule: weekly
+  workflow_dispatch:
+    inputs:
+      target_path:
+        description: 'Target directory or file to analyze (e.g., src/ast/, src/smt/smt_context.cpp)'
+        required: false
+        default: ''
+      target_class:
+        description: 'Specific class name to analyze (optional)'
+        required: false
+        default: ''
+
+roles: [write, maintain, admin]
+
+permissions:
+  contents: read
+  issues: read
+  pull-requests: read
+
+tools:
+  github:
+    toolsets: [default]
+  view: {}
+  glob: {}
+  grep: {}
+  edit: {}
+  bash:
+    - ":*"
+
+safe-outputs:
+  create-pull-request:
+    if-no-changes: ignore
+  missing-tool:
+    create-issue: true
+
+timeout-minutes: 45
+
+steps:
+  - name: Checkout repository
+    uses: actions/checkout@v5
+
+---
+
+<!-- Edit the file linked below to modify the agent without recompilation. Feel free to move the entire markdown body to that file. -->
+@./agentics/specbot.md