[nightshift] ci-fixes: remove unused Node.js from test job, add concurrency groups and timeouts

[nightshift-micr]

Automated by Nightshift v3 (GLM 5.1).

Task: ci-fixes
Category: pr
Repo: Microck/traccia

Changes

ci.yml

• Remove unused Node.js setup from test job — the test job only runs Python lint/test, Node.js is only needed in the package job for npm smoke tests. This saves ~10-15s per matrix run (2 runs).
• Add concurrency group with — prevents duplicate CI runs when pushing rapidly to the same branch.
• Add timeout-minutes — test job: 15min, package job: 10min. Prevents hung workflows from burning runner minutes indefinitely.

release.yml

• Add concurrency group with — prevents accidental double-publishing on race conditions while still grouping runs.
• Add timeout-minutes to all jobs — build: 15min, publish jobs: 5min each.

Impact

• ~30s faster CI per push (removed Node.js setup × 2 matrix runs)
• Better resource management with concurrency control and timeouts
• No behavior changes to test execution or build output