Bump llm-d-planner git pin to latest upstream HEAD+12 commit

[Copilot]

Description

Updates the repository’s tracked llm-d-planner (git) dependency from 92b14fe... to the current upstream HEAD+12 commit to keep install and version-tracking metadata aligned.

• Dependency pin update
  • install.sh: updates PLANNER_GIT to 36151bb806298e09520ba433218384152eb7c69e
• User-facing install docs sync
  • README.md: updates manual pip install planner git SHA
• Upstream tracking doc sync
  • docs/upstream-versions.md: updates llm-d-planner (git) current pin entry

# before
PLANNER_GIT="git+https://github.com/llm-d-incubation/llm-d-planner.git@92b14fe09fea0ec9ff36539326b7a8df00f1022c"

# after
PLANNER_GIT="git+https://github.com/llm-d-incubation/llm-d-planner.git@36151bb806298e09520ba433218384152eb7c69e"

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Validated dependency/SBOM pin parsing with the existing focused suite:

• python -m pytest tests/test_generate_sbom.py -v

Test Configuration

• Kubernetes version: N/A

Checklist

• My changes follows the style guidelines of this project
• I have performed a self-review of my own changes
• I confirm that a full ./setup/standup.sh -> run.sh -> ./setup/teardown.sh sequence completed successfully
• I confirm that pre-commit run was run and all checks passed
• I have updated the documentation accordingly