docs(docs): Add a quickstart and the example files it copies

[aywrite]

What changed

• docs/QUICKSTART.md walks through setting up a strength match in an engine's own repository. It covers:

  • the build script
  • the workflow
  • a first run
  • a sequential test carried across runs
  • testing a pull request

  It ends with the errors a first run is likely to hit and a table of the common inputs. The README links to it from the opening section.

• examples/ holds the files the guide copies until there is an example repository:

  • build_at.sh, written for cargo, with make and cmake versions of its two build lines given in the guide
  • strength.yml, a match run by hand
  • sprt.yml, a sequential test run by hand and carried across runs with prior_pairs

• tests/test_examples.py checks the examples and the guide:

  • every call and every version the guide names is the current release
  • every input the examples pass is one that strength.yml takes at that tag, and none it requires is left out
  • the guide's copy of the example workflow matches the file
  • the build script is executable in git
  • run against a stub cargo, with the relative path batch.yml passes, the build script builds the commit it is given and leaves the working tree alone. It also checks that the export is stamped at extraction time, not with the commit's time.

• docs/BUILDING-A-REF.md said git archive stamps files at extraction time by default. It records the commit's time, and tar -m is what stamps them at extraction. I checked this with a real extract.

• The call in .github/workflows/README.md named v0.3.0 and now names v0.6.0.

• AGENTS.md says the examples move with the self pins on a release branch.

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