cluster-only labels fails: Expecting value: line 1 column 6 (char 5)

[vdgbcrypto]

Bug Description

graphify cluster-only <path> fails to label communities and falls back to Community N placeholders with a JSON decode error.

Steps to Reproduce

1. Install graphify on Windows/Hermes: pip install graphifyy && graphify install --platform hermes
2. Use a corpus with mixed code + 1 doc file and set a working LLM key, e.g.:
   • export GOOGLE_API_KEY=...
   • graphify "H:/path/to/small-project"
3. Run: graphify cluster-only "H:/path/to/small-project"

Expected Behavior

All communities are labeled with meaningful names and the report is generated.

Actual Behavior

[graphify label] batch 1/1 (6 communities) failed: Expecting value: line 1 column 6 (char 5)
[graphify label] warning: community labeling failed (Expecting value: line 1 column 6 (char 5)); using Community N placeholders.

GRAPH_REPORT.md is still written, but all community names remain Community N.

Environment

• OS: Windows 10
• Shell: Git Bash / MSYS2
• graphify: 0.9.6
• Hermes: installed via graphify install --platform hermes
• LLM backend: gemini via GOOGLE_API_KEY / --backend

Notes

• Initial extraction succeeds, including semantic extraction via gemini.
• Re-running cluster-only on the existing graph still reproduces the JSON parse failure.
• Related: issue bug: graphify install --platform hermes installs skill to wrong directory on Windows #1403 was fixed for Windows install path; this appears unrelated.