fix(packaging): ship configs/ directory so non-editable installs work (#133)

* fix(packaging): ship configs/ directory so non-editable installs work

CLI_CONFIG_PATH in agent.main resolves to <site-packages>/configs/cli_agent_config.json,
but [tool.setuptools.packages.find] only included "agent*" so neither configs/
nor its JSON files were copied during a non-editable install (uv tool install,
pip install without -e). Editable installs worked by accident because they
reference the source tree directly.

Result: ml-intern crashed at startup with FileNotFoundError on every fresh
non-editable install, until the configs were manually copied into site-packages.

Make configs/ a real package (empty __init__.py) and ship its JSON via
[tool.setuptools.package-data]. Verified with uv tool install --reinstall.

* fix(packaging): also ship agent/prompts/*.yaml + agent/README.md

Same root cause as the configs/ shipping fix in the prior commit, with a
worse symptom: ContextManager._load_system_prompt opens
agent/prompts/system_prompt_v3.yaml at runtime, but setuptools doesn't
include non-Python files inside packages without explicit package-data.

Symptom in headless mode: Session() → ContextManager() raises
FileNotFoundError inside submission_loop; agent_task is set to "done with
exception" but headless_main awaits event_queue.get() forever waiting for
"ready", so the process hangs indefinitely with no log output. The
exception is recoverable only via an asyncio task dump.

Editable installs ship the source tree as-is, which is why this didn't
surface until non-editable reinstall.

---------

Co-authored-by: Aksel Joonas Reedi <125026660+akseljoonas@users.noreply.github.com>

pyproject.toml

@@ -58,7 +58,20 @@ requires = ["setuptools>=64"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools.packages.find]
-include = ["agent*"]
+# `configs` ships the JSON files loaded by agent.main.CLI_CONFIG_PATH at
+# runtime (resolves to <site-packages>/configs/cli_agent_config.json).
+# Without it, `uv tool install` / `pip install` produce a broken install
+# that imports fine but crashes at startup with FileNotFoundError.
+include = ["agent*", "configs"]
+
+[tool.setuptools.package-data]
+configs = ["*.json"]
+# Agent data files: system prompts loaded by ContextManager._load_system_prompt
+# at runtime (`<site-packages>/agent/prompts/system_prompt_v3.yaml`), plus the
+# package README. Without these, headless_main hangs forever — submission_loop
+# crashes with FileNotFoundError but headless_main doesn't check agent_task.done()
+# and just keeps awaiting the "ready" event_queue item that will never come.
+agent = ["README.md", "prompts/*.yaml"]
 
 [tool.uv]
 package = true