[Backport] Add NNPuppiTauModel external spec and toolfile

[artlbv]

Backport of #10665

Summary

Adds the SCRAM build/install plumbing for the new cms-hls4ml/NNPuppiTauModel external package, following the same precedent already used for L1TSC4NGJetModel/AXOL1TL. This package replaces the in-tree, un-namespaced hls4ml weight arrays (w2, b2, ..., w20, b20) previously compiled directly into L1Trigger/Phase2L1ParticleFlow's TauNNIdHW, which were vulnerable to ELF symbol interposition when multiple hls4ml models were loaded into the same process (the bug class behind cms-sw/cmssw#49632).

This is part of a 3-PR migration:

1. New external repo: cms-hls4ml/NNPuppiTauModel — the externally-built package itself.
2. This PR — cmsdist spec + toolfile so SCRAM builds/installs the new external.
3. [Phase-2 L1T] Move TauNNIdHW to the externally-built NNPuppiTauModel package cmssw#51263 — cmssw changes to consume it via hls4mlEmulator::ModelLoader/hls4mlEmulator::Model.

Changes

• NNPuppiTauModel.spec (new) — RPM spec for the external, modeled on L1TSC4NGJetModel.spec/AXOL1TL.spec: fetches the release tarball from cms-hls4ml/NNPuppiTauModel, builds via make against hls4mlEmulatorExtras/hls, installs into $PREFIX.
• scram-tools.file/tools/NNPuppiTauModel/nnpuppitaumodel.xml (new) — SCRAM toolfile exposing NNPUPPITAUMODEL_BASE/LIBDIR environment variables for the new external, modeled on l1tsc4ngjetmodel.xml.
• cmssw-tools.spec — adds Requires: NNPuppiTauModel alongside the existing L1-trigger model externals (L1TSC4NGJetModel, L1TSC82ProngJetModel, etc.), so it's pulled into every CMSSW release.

Dependencies

Requires a tagged release of cms-hls4ml/NNPuppiTauModel to exist before this can build successfully.

PR validation

None yet.

cms-bot code-checks will perform the first real build test of the spec/toolfile/package Makefile chain.

[cmsbuild]

A new Pull Request was created by @artlbv for branch IB/CMSSW_17_0_X/master.

@akritkbehera, @cmsbuild, @iarspider, @raoatifshad, @smuzaffar can you please review it and eventually sign? Thanks.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.
cms-bot commands are listed here

• Backported from Add NNPuppiTauModel external spec and toolfile #10665

[cmsbuild]

cms-bot internal usage

[quinnanm]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8b77aa/54484/summary.html
COMMIT: 2efedb4
CMSSW: CMSSW_17_0_X_2026-07-02-1100/el8_amd64_gcc13
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/10679/54484/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 14 lines to the logs
• Reco comparison results: 10 differences found in the comparisons
• DQMHistoTests: Total files compared: 54
• DQMHistoTests: Total histograms compared: 4337615
• DQMHistoTests: Total failures: 35
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 4337560
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 53 files compared)
• Checked 232 log files, 203 edm output root files, 54 DQM output files
• TriggerResults: no differences found

[cmsbuild]

REMINDER @sextonkennedy, @ftenchini, @mandrenguyen: This PR was tested with cms-sw/cmssw#51294, please check if they should be merged together