feat: agent-orchestrator v0.1.0 — generic multi-agent harness

Extracted and generalized from a project-specific agent launch engine. No project
specifics remain in code: paths, the loop kickoff preamble, handoff conventions, and the
on-complete hook are all config/template driven; session_prefix + log_dir are required.

- agents.py: driver + watchdog (data-driven backends via prompt_delivery arg|ping|exec;
  required session_prefix/log_dir; project-rooted path resolution; configurable kickoff
  template, handoff patterns, on_complete task; tmux-safe; selftest + init verbs)
- agent-log.py: config-driven claude transcript renderer
- agents.example.toml: self-contained 2-agent example (dependency-free demo backend)
- prompts/: generic builder/adversary/kickoff templates
- smoke.sh: isolated up+down sandbox proof that cleans up after itself
- flake.nix/.lock: devShell (python311 + tmux + git)
- README.md: schema + verbs + AI-PO usage + nix

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1751274312,
+        "narHash": "sha256-/bVBlRpECLVzjV19t5KMdMFWSwKLtb5RyXdjz3LJT+g=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "50ab793786d9de88ee30ec4e4c24fb4236fc2674",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "50ab793786d9de88ee30ec4e4c24fb4236fc2674",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}