ci: unify workflow names, triggers and release permissions #patch

[nmichlo]

Why

Follow-up to the shared-workflow adoption. Three gaps were left: file names and triggers
still differed per repo, and the release caller did not grant its own permissions.

Naming and triggers

Every repo now has the same three files with the same names, extensions and job names:

	before	after
lint	lint.yml / python-lint.yml / ci.yml	lint.yaml
test	python-test.yml / python-tests.yml / ci.yml	test.yaml
release	release.yaml / release.yml	release.yaml

Lint and test now both run on the same events everywhere -- every PR, plus every push to
main so a merge is verified even if no PR check covered it:

on:
  pull_request:
  push:
    branches: [main]

Previously lint was PR-only in three repos but push+PR in norfair-rs, and tests were
PR-only in disent but tags-plus-branch-filtered in mtg-dataset.

The release caller now grants its own permissions

mtg-vision's release run failed at startup when PR #1 merged:

X This run likely failed because of a workflow file issue.

Cause: a reusable workflow cannot hold more permission than its caller. The shared
release.yaml pushes tags and creates releases, so it needs contents: write -- but
mtg-vision's default workflow token is read-only, while mtg-dataset and disent default
to write. Same caller, three different outcomes:

repo	default_workflow_permissions	result
mtg-vision	read	startup_failure
mtg-dataset	write	success, tagged v0.4.0
disent	write	success, tagged v0.9.0

Fixed on the caller rather than by changing a repo setting, so the workflow behaves the
same everywhere regardless of how a repo is configured:

jobs:
  release:
    permissions:
      contents: write
    uses: nmichlo/.github/.github/workflows/release.yaml@main

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.37%. Comparing base (be80c08) to head (876aa2b).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   69.01%   68.37%   -0.64%     
==========================================
  Files         136      136              
  Lines        7613     7466     -147     
==========================================
- Hits         5254     5105     -149     
- Misses       2359     2361       +2     

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