detect_backend() picks a cloud provider purely from whichever API key is set
in the environment, and community labeling additionally falls back to claude -p
when the CLI is on PATH. Keys in a developer environment are often there for
other tools, so a bare `graphify extract .` could send uncached documents to a
provider the user did not intend.
Add explicit control without breaking existing auto-detect flows:
- GRAPHIFY_BACKEND=<name> selects a backend explicitly and wins over ambient
keys; GRAPHIFY_BACKEND=none disables every LLM backend, including the label
claude -p fallback. `graphify extract` then keeps the local AST pass and
reports what it held back instead of failing or auto-selecting a provider.
- Auto-detection now reports the exact environment variable that selected the
backend, so sending a corpus to a cloud provider is never a surprise.
- The claude -p labeling fallback is announced, and GRAPHIFY_BACKEND=none opts
out of it (it is otherwise kept: silently downgrading good labels to
"Community N" was the reason it exists).
- extract_files_direct raises a clear error naming GRAPHIFY_BACKEND when the
library caller would otherwise auto-detect a disabled backend.
README data-residency note updated. detect_backend_with_source() now carries the
detection logic and names its source; detect_backend() delegates to it.
Note: this deliberately keeps auto-detection ON by default (the issue's
alternative #2) rather than flipping cloud use to opt-in, which would break
every existing key-less `graphify extract` flow. GRAPHIFY_BACKEND makes the
opt-in switch a one-liner for a follow-up if maintainers prefer it.
N. Hariharan
7e2467ea43