fix: stop auto-loading context.txt into Streamlit sessions

[DavidJBianco]

Summary

Stops peak_assistant/streamlit/app.py from automatically reading context.txt from disk and injecting it into every user session, which could forward sensitive server-side data to external LLM providers.

Initializes st.session_state["local_context"] to "" instead. Users provide context explicitly via the in-UI Local Context field. Adds an inline comment explaining the security rationale.

Cherry-picked from #76. Closes #75 (duplicate, identical change with a less explanatory comment).

Test plan

• Launch Streamlit app, verify Local Context field starts empty
• Verify agents run normally with no local context set
• Verify manually entering context in the field works as expected

🤖 Generated with Claude Code

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[chatgpt-codex-connector]

Restore a configurable local_context source

Setting st.session_state["local_context"] to "" here removes the only initialization path in the Streamlit app, and there is no other write path in peak_assistant/streamlit to populate that key before util/runners.py forwards it to every agent call. In practice, Streamlit sessions now always run with empty local context, so users lose the previous context-file behavior and the --context/PEAK_CONTEXT_FILE compatibility path becomes effectively unused.

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[DavidJBianco]

Merged into dev via merge commit 39cb907.