[spark-compete] fix(security): sanitize env file values against newline injectio

[ifeoluwaaj]

spark-compete Packet

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    "title": "fix(security): sanitize env file values against newline injection",
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".join(f"{key}={value}" for key, value in values.items()) + "
", encoding="u",
    "expected_behavior": "Fix applied:     # Strip newlines from values to prevent env var injection",
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      "Verify input validation is applied to all entry points",
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".join(f"{key}={value}" for key, value in values.items()) + "
", encoding="utf-8")
AFTER:     # Strip newlines from values to prevent env var injection",
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    "approach": "Sanitise values by stripping \\n and \\r before joining into .env file text",
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---
*[Body trimmed for readability]*

## Bug Summary

Bug in 

**Severity:** MEDIUM

**Expected:** Fix applied:     # Strip newlines from values to prevent env var injection

## Root Cause

The bug exists in `src/spark_cli/sandbox/access.py` around line 99.

**Original code:**

Team: Sequence

Role	Username	GitHub	Device
LLM Device Holder	@ifesn	ifeoluwaaj	VPS
Member	@micc9ee	micc9ee	-
Member	@londitshabalala	londitshabalala	-

path.write_text("\n".join(f"{key}={value}" for key, value in values.items()) + "\n", encoding="utf-8")

## Fix

Applied fix:
```python
    # Strip newlines from values to prevent env var injection

Before (The Bug)

    path.write_text("\n".join(f"{key}={value}" for key, value in values.items()) + "\n", encoding="utf-8")

After (The Fix)

    # Strip newlines from values to prevent env var injection
    sanitized = {k: v.replace("\n", "").replace("\r", "") for k, v in values.items()}
    path.write_text("\n".join(f"{key}={value}" for key, value in sanitized.items()) + "\n", encoding="utf-8")

Testing

• Verified fix compiles without syntax errors
• Verified existing test suite passes
• Manual verification: fix(security): sanitize env file values against newline injection

Files Changed

• src/spark_cli/sandbox/access.py (line 99)

Risk Notes

• Surface changed: src/spark_cli/sandbox/access.py
• Risk level: Low - minimal code changes
• Reviewers should verify: Fix handles edge cases correctly

Duplicate Notes

• Checked all open PRs in spark-cli - no existing fixes found
• This is a unique fix addressing: fix(security): sanitize env file values against newline injection