Added conditional dev CI routing

[fdesbiens]

Summary

• Added a conditional dev workflow for pull requests and pushes targeting dev, plus manual full-suite dispatch.
• Added a repository-local classifier and profile map using only Python standard-library and Git tooling.
• Always runs NetXDuo/default_build_coverage as a real smoke build/test and adds affected profiles for component changes.
• Conservatively selects every declared suite/profile for public headers, shared infrastructure, unreliable Git ranges, classifier failures, and unknown paths.
• Reuses the measured eight-way NetXDuo partition for full fallbacks while keeping the smoke profile unique.
• Added CI / dev gate aggregation that rejects failed, cancelled, or unexpectedly skipped selected jobs.
• Cancels superseded pull-request runs while leaving push/manual runs independent.
• Keeps the legacy regression workflow unchanged during rollout.

Validation

• 31 classifier and gate regression tests passed.
• Python standard-library trace reported 100% executable-line coverage for classify_changes.py and check_dev_gate.py.
• The checked-in map matches every live CMake BUILD_CONFIGURATIONS list: NetXDuo 43, Web 3, PTP 3, MQTT 9, MQTT Interoperability 9, NetXDuo64 1, NetXDuo Fast 1, Secure 19, Secure Interoperability 18, and Crypto 4.
• Full routing covers each of the 43 NetXDuo profiles exactly once between the mandatory smoke job and eight additional shards.
• Workflow YAML, profile-map JSON, generated JUnit XML, coverage XML, and whitespace checks passed.
• Local CMake/Ninja NetXDuo default_build_coverage smoke: 915 of 915 tests passed, with XML and HTML coverage reports generated by gcovr 8.6.
• The local smoke build used the host GCC 13.3 because system package installation requires interactive sudo; the reusable worker continues to enforce Ubuntu 24.04 and GCC 14. No production C or assembly source changed in this PR.

Documentation

No documentation update is proposed because this changes CI policy and routing only; it does not add or alter a public NetX Duo API.