Fix Eleusis for current Verifiers chat program source (#23)

## Summary

- Use Verifiers' `CHAT_PROGRAM_SOURCE` in the Eleusis null harness.
- Pin Verifiers to commit `7eaa262` (`0.3.2.dev128`), which includes the
rename, so installs used for training resolve the compatible source.
- Allow the direct Git dependency in Hatchling metadata and document the
pin.

`uv sync --all-extras` completed in `environments/eleusis` with the
pinned Verifiers commit.


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> [!NOTE]
> ### Fix Eleusis harness to use `CHAT_PROGRAM_SOURCE` and pin Verifiers
to commit `7eaa262`
> - Replaces the Null harness `PROGRAM_SOURCE` with the shared
`CHAT_PROGRAM_SOURCE` from launch utilities in
[harness.py](https://github.com/PrimeIntellect-ai/residency-environments/pull/23/files#diff-30c0abedb7aff32c08b6b8a66e8de2362647d919455b5102dadb05c04a5a4817),
assigning it to `ELEUSIS_PROGRAM_SOURCE`
> - Switches the Verifiers dependency in
[pyproject.toml](https://github.com/PrimeIntellect-ai/residency-environments/pull/23/files#diff-1cac076d0da70b40f95a6ecf61cd5ba94a1a9eeef4494fd1367da70a76936e0b)
from a `>=0.3.0,<0.4` version range to a direct Git dependency pinned to
commit `7eaa262`, enabling Hatch's `allow-direct-references`
> - Documents the pinned commit in
[README.md](https://github.com/PrimeIntellect-ai/residency-environments/pull/23/files#diff-0ae3cc3192a10f625bab934b96494d674260c695d6b74043a9a4f2fadb1c5062)
so the chat harness matches the training version
> - Behavioral Change: installing the Eleusis project now resolves
Verifiers from the pinned Git commit instead of the published package
version range
>
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Author: nph4rd

environments/eleusis/README.md

@@ -39,6 +39,9 @@ Unsolved episodes receive zero.
 
 ## Run
 
+Eleusis pins Verifiers to commit `7eaa262` so the chat harness matches the
+version used for training.
+
 ```bash
 uv run eval eleusis -m <model>
 ```

environments/eleusis/eleusis/harness.py

@@ -6,9 +6,10 @@
 injected messages or recovery turns.
 """
 
-from verifiers.v1.harnesses.null.harness import PROGRAM_SOURCE, NullHarness
+from verifiers.v1.harnesses.null.harness import NullHarness
+from verifiers.v1.harnesses.utils.launch import CHAT_PROGRAM_SOURCE
 
-ELEUSIS_PROGRAM_SOURCE = PROGRAM_SOURCE
+ELEUSIS_PROGRAM_SOURCE = CHAT_PROGRAM_SOURCE
 
 
 class EleusisHarness(NullHarness):

environments/eleusis/pyproject.toml

@@ -5,14 +5,17 @@ description = "A long-horizon inductive-reasoning card game environment with nat
 tags = ["eleusis", "card-game", "multiturn", "tool-use", "inductive-reasoning", "eval", "verifiers"]
 requires-python = ">=3.11,<3.14"
 dependencies = [
-    "verifiers>=0.3.0,<0.4",
+    "verifiers @ git+https://github.com/PrimeIntellect-ai/verifiers.git@7eaa262",
     "datasets>=3.0",
 ]
 
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
+[tool.hatch.metadata]
+allow-direct-references = true
+
 [tool.hatch.build.targets.wheel]
 packages = ["eleusis"]