1.9.1 release

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+# GeneCup Release Notes
+
+## Version 1.9.1 (2026-04-05)
+
+### UI/UX
+- Added header/footer in GN color scheme with version info across all pages
+- Added --port and --debug command line switches
+- Show environment variables (EDIRECT_PUBMED_MASTER, GEMINI_API_KEY, NLTK_DATA, GENECUP_DATADIR) on startup
+- Added intermediate "Calling Gemini API..." loading page that auto-refreshes when classification completes
+
+### Gemini API integration
+- Replaced TensorFlow stress classifier with Google Gemini API (gemini-2.5-pro for few-shot, gemini-3-flash-preview for batch)
+- API key read from ~/.config/gemini/credentials (with 0400 permission check)
+- Batch classification: all stress sentences classified in one API call with JSON response
+- In-memory cache for Gemini results (keyed by SHA-256 of sentence batch)
+- Retry logic (3 attempts with 2s/4s backoff)
+- Gemini prompts and responses logged to console
+
+### PubMed / edirect
+- Packaged edirect 25.x for Guix (Go programs compiled from source, XML bounds-check patch)
+- Replaced missing fetch-pubmed with xfetch -db pubmed (local archive lookup)
+- Hybrid abstract fetching: tries local xfetch first, falls back to NCBI efetch for PMIDs missing from the local archive
+- In-memory cache for esearch PMID results (keyed by SHA-256 of query string)
+- EDIRECT_LOCAL_ARCHIVE env var configures local PubMed archive path
+
+### Packaging (guix.scm)
+- Added edirect-25, nltk-punkt, minipubmed, python-google-genai packages
+- genecup-gemini package with genecup wrapper script, JavaScript assets, NLTK data
+- GENECUP_DATADIR for sqlite DB location
+
+### Testing
+- Added Python unittest framework (tests/)
+- test_hello.py: offline smoke test (runs in guix build)
+- test_network_esearch.py: NCBI esearch for Penk+stress PMIDs
+- test_local_xfetch.py: local xsearch+xfetch against PubMed archive
+- test_network_hybrid.py: validates hybrid fetch matches NCBI; tests esearch cache
+
+### Cleanup
+- Moved dead code to old/server.py
+- Removed unused TensorFlow/Keras dependencies
+- Removed stress_prompt.txt dependency (batch classifier builds its own prompt)