fix: remove dead .plans/ paths from __init__.py docstring (TE-7)

Module docstring referenced internal dev artifacts that were
relocated to ~/proj/devflow/ and are not in the public repo.

Refs devonartis/agentwrit#31

Generated with Claude Code Harness Agent

Co-Authored-By: Claude <claude@anthropic.com>

Author: claude

src/agentwrit/__init__.py

@@ -4,8 +4,6 @@
 entry point, Agent is an ephemeral per-task principal created by the app.
 All agent authority flows from the app's scope ceiling set by the operator.
 
-Spec: .plans/specs/NEW_SPECS_TO_USED.md
-ADRs: .plans/specs/SPEC_ADR.md (SDK-001 through SDK-012)
 """
 
 from __future__ import annotations