fix: remove stale release-as and fix CLASSPATH undefined var warning

[devin-ai-integration]

Summary

Two cleanup fixes:

1. Remove release-as: "1.6.0" from release-please-config.json — v1.6.0 has been released, so the one-shot override must be removed to prevent the staleness guard from blocking future releases. Future versions will bump normally from the manifest (now at 1.6.0).

2. Fix $CLASSPATH undefined variable warning in Dockerfile line 12 — ENV CLASSPATH=$CLASSPATH:... referenced $CLASSPATH before it was defined, producing a Docker build warning (UndefinedVar). Removed the self-referencing prefix since no prior CLASSPATH value exists in the base image.

Review & Testing Checklist for Human

Risk: 🟢 Low

• Verify the Docker build no longer shows the UndefinedVar warning for $CLASSPATH
• Verify release-please creates normal version bumps on the next feat:/fix: merge (no longer stuck on 1.6.0)

Notes

• The CLASSPATH change is safe because the python:3.11-slim base image does not set CLASSPATH, so the self-reference always resolved to an empty string (producing a leading : in the path). Removing it produces a cleaner value.

Link to Devin session: https://app.devin.ai/sessions/c8038ad2684a4fd786c6aa2a07ce9425
Requested by: @kphunter

[devin-ai-integration]

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