Propose a patch

Evidence

The sandbox observed nothing beyond the static findings; the proposal cites those.

diff --git a/src/ksef_mcp/invoices/statement.py b/src/ksef_mcp/invoices/statement.py
--- a/src/ksef_mcp/invoices/statement.py
+++ b/src/ksef_mcp/invoices/statement.py
@@ -116,1 +116,0 @@
-BYTE_ORDER_MARK: Final[str] = ""

Zero-context hunks: apply with git apply --unidiff-zero fix.patch on the tagged source of 0.4.1. If the behavior is intended, declare it (host under permissions.network, a line in the README) instead of removing it; the next crawl scores declarations.

Issue / PR body

Title: ksef-mcp: Hidden zero-width characters detected (KillerSkills verdict caution 79)

## What the honeypot observed
KillerSkills ran **[email protected]** in an isolated sandbox (decoy credentials, recording proxy, syscall trace; engine 1.5) and scored it **CAUTION 79/100**. Summary: no network, touches nothing outside the project, writes no memory.

- See the findings below.

Full trace and findings: https://killerskills.ai/skills/pypi/ksef-mcp/0.4.1

## Findings with a location
- `src/ksef_mcp/invoices/statement.py:116` · Hidden zero-width characters detected — src/ksef_mcp/invoices/statement.py:116 · Hidden zero-width characters detected — may conceal content

## Proposed change
The attached patch removes the 1 line above. If the behavior is intended, the fix is to declare it instead: list the host under `permissions.network` (or the MCP manifest) and say in the README why the package needs it; the next crawl will re-score it with the declaration taken into account.

## How this will be verified
Nothing is "verified safe" by assertion. When a new version is published, KillerSkills re-runs it in the honeypot and the verdict page updates; you can trigger it early from the verdict page ("Re-scan after I publish a fix"). Reply here or at [email protected] if you believe the verdict is wrong; disputes are reviewed by a person and the outcome is published on the verdict page.

_Proposed through killerskills.ai/threats by a user of the package, under their own GitHub account. The evidence is public; the package was never modified by KillerSkills._