Fixes to modelconverter analyze

[dtronmans]

Purpose

Summary of the fixes needed:

• Stop recreating the modified ONNX multiple times: generate the temporary modified ONNX once and reuse it for collecting debug output names and comparing ONNX vs DLC.
• Capture the raw debug tensor names that SNPE writes.
• Create the required output directories on the device before running snpe-net-run.
• Strip leading "/" from SNPE tensor names before joining paths (had a problem with "/" in module names).
• Log actual SNPE stdout/stderr on failure instead of only showing a Python CalledProcessError.

Also adapted the README to include the more precise command for running modelconverter analyze

Specification

None / not applicable

Dependencies & Potential Impact

None / not applicable

Deployment Plan

None / not applicable

Testing & Validation

None / not applicable

AI Usage

Assisted-by: AGENT_NAME:MODEL_VERSION [TOOL1] [TOOL2]

Submitted code was reviewed by a human: YES/NO

The author is taking the responsibility for the contribution: YES/NO

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a2cc8314-4e7b-4d3d-aa42-8be620eb8c3f

📥 Commits

Reviewing files that changed from the base of the PR and between 6da1965 and 50faa78.

📒 Files selected for processing (4)

• README.md
• constraints.txt
• docker/rvc4/Dockerfile
• modelconverter/packages/rvc4/analyze.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/analyze

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