refactor: remove env.py module and update plan

- Delete env.py module (functionality moved or no longer needed)
- Update docs/plan.md to reflect Milestone 2 completion
- Clean up constants.py by removing unused environment-related constants

docs/plan.md

@@ -20,11 +20,10 @@ Work on ONE milestone at a time. Each milestone is one branch (`milestone/NN-nam
 - [x] Verify: create `.venv`, upgrade pip, `pip install -e ".[dev]"`
 - [x] Save plan and milestones in `docs/plan.md`
 
-## Milestone 2 - Core auction logic and env loader (`milestone/02-core-logic`)
+## Milestone 2 - Core auction logic (`milestone/02-core-logic`)
 
 - [x] `auction.py` (Doxygen comments): `add_bid`, `find_winner` (uses `max(bids, key=bids.get)`, `ValueError` on empty)
-- [x] `env.py`: stdlib `.env` loader (no python-dotenv); does not override existing environment variables
-- [x] `tests/test_auction.py` (`.env` loader is for private use and intentionally not tested)
+- [x] `tests/test_auction.py`
 - Verify: `pytest` passes
 
 ## Milestone 3 - CLI program (`milestone/03-cli`)

src/secret_auction/constants.py

@@ -11,12 +11,6 @@ YES_ANSWERS = ("yes", "y")
 ## Answers accepted as "no" when asking for more bidders.
 NO_ANSWERS = ("no", "n")
 
-## Path of the file holding environment variables (tokens).
-ENV_FILE = ".env"
-
-## Name of the environment variable holding the Gitea token.
-GITEA_TOKEN_ENV_VAR = "GITEA_TOKEN"
-
 ## Prompt asking for the bidder's name.
 PROMPT_NAME = "What is your name? "
 

src/secret_auction/env.py

@@ -1,38 +0,0 @@
-"""! @file env.py
-@brief Minimal `.env` file loader using only the standard library.
-"""
-
-import os
-from pathlib import Path
-
-
-def parse_env(text: str) -> dict[str, str]:
-    """! @brief Parse `KEY=VALUE` lines.
-    @param text Contents of a `.env` file. Blank lines and `#` comments are ignored.
-    @return Dictionary of parsed variables; surrounding quotes are stripped.
-    """
-    values: dict[str, str] = {}
-    for line in text.splitlines():
-        line = line.strip()
-        if not line or line.startswith("#") or "=" not in line:
-            continue
-        key, value = line.split("=", 1)
-        value = value.strip()
-        if len(value) >= 2 and value[0] == value[-1] and value[0] in "\"'":
-            value = value[1:-1]
-        values[key.strip()] = value
-    return values
-
-
-def load_env(path: str | Path) -> dict[str, str]:
-    """! @brief Load a `.env` file into `os.environ` without overriding existing variables.
-    @param path Path to the `.env` file; a missing file is not an error.
-    @return Dictionary of the variables read from the file.
-    """
-    file = Path(path)
-    if not file.is_file():
-        return {}
-    values = parse_env(file.read_text(encoding="utf-8"))
-    for key, value in values.items():
-        os.environ.setdefault(key, value)
-    return values