fix(build): only use v* tags for setuptools_scm version

[yhl-amd]

Problem

Since the lmcache-v0.5.6.dev98-g05fc77a0-rocm-torch210 release tag was created (2026-09-24 09:50 UTC), it is the nearest tag reachable from main. setuptools_scm picks it via git describe and fails to parse it:

ValueError: Can't parse version from tag 'lmcache-v0.5.6.dev98-g05fc77a0-rocm-torch210'

As a result pip install -e . fails, breaking Pre Checkin "Run non-GPU unit tests" on main and all PRs based on recent main (e.g. https://github.com/ROCm/ATOM/actions/runs/35996699729/job/107623216735).

Fix

Add git_describe_command with --match "v[0-9]*" so only ATOM version tags (v0.1.6, v0.1.6-rc0, ...) are considered. The lmcache release/tag is kept as-is.

Verification

• Without fix: python -m setuptools_scm → the ValueError above
• With fix: python -m setuptools_scm → 0.1.7.dev28+g3a2df1d... (derived from v0.1.6)

🤖 Generated with Claude Code

[github-actions]

🏷️ CI Guide

Runs automatically on every eligible PR before approval:

• ✅ Pre Checkin: Black, Ruff, catalog schema validation, non-GPU unit tests

Heavy model tests:

• ✅ Run after the PR is approved and Pre Checkin passes
• ✅ Run immediately when an approval review is submitted
• ✅ Can be requested before approval with labels

Label	Tests
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ci:atom	Run native ATOM model accuracy tests
ci:vllm	Run ATOM vLLM OOT model accuracy tests
ci:sglang	Run ATOM SGLang model accuracy tests

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[yhl-amd]

Folded into #2395 together with the LMCache wheel workflow change, so both land with one review.