[tae898]

Changes the concurrency blocks of test-jvm.yml, test-python-examples.yml and test-native.yml so superseded runs stop piling up. On 2026-11-05, with eight merges to main in one day, push runs of the JVM and examples workflows each got a group of their own (run_id), so 21 stale runs and about 70 macOS jobs queued behind each other on a runner cap shared with ArcadeData/arcadedb.

Event	Group	Cancel in progress
pull_request	one per PR	yes (unchanged)
push to main	one per workflow	JVM and examples: no, native: yes (unchanged)
schedule	one per workflow	yes
workflow_dispatch	one per run	no
workflow_call from a release (tag push)	one per run (native: per tag ref)	no

With cancel-in-progress: false on main, GitHub keeps one running and one pending run per group, and a newer pending run replaces the older pending one, so the queue stays at two and the pending run is always the newest commit. Each merge was already gated green on its pull request. In a workflow_call the github.event_name is the caller's (a tag push), so the push case also requires github.ref == 'refs/heads/main': a release run keeps its own group and a push to main cannot replace it. In test-native.yml a manual dispatch no longer shares the group of a push to main, and the nightly run has its own group. The release workflows (release-jvm.yml, release-native.yml, release-notes.yml) are unchanged and still never cancel.

tests/test_workflow_concurrency.py reads the three blocks, evaluates the group and cancel expressions for each event and checks that a new push to a PR cancels the old run, pushes to main share a group, a dispatch and a release run have groups of their own and are never cancelled, and a release run cannot share the group of main. The old blocks fail it. actionlint, shfmt and the YAML hook pass.

This workflow change starts runs when it is merged, and the issue asked for the change after the 26.11.1 tag, while the macOS queue is full. Out of scope, as in the issue: whether the examples workflow should run all 16 legs on every push to main.

Closes #271

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