chore: point fork notice and upstream headers to correct origin repo

[codenamekt]

Fixing the headers to point to the correct upstream fork that this plugin originates from

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (18 files)

• docker/Dockerfile
• docker/compose.yml
• docker/entrypoint.sh
• hexus/__init__.py
• hexus/ccr/cache.py
• hexus/embed.py
• hexus/embedder.py
• hexus/migrations/001_schema.sql
• hexus/pipeline/router.py
• hexus/store.py
• hexus/writer.py
• mcp_server/__init__.py
• mcp_server/cli.py
• mcp_server/server.py
• mcp_server/tools.py
• pyproject.toml
• tests/test_conformance.py
• tests/test_mcp_server.py

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_{Reviewed by deepseek-v4-pro · Input: 31.9K · Output: 2.9K · Cached: 151.9K}