#554: catch unused motive files via test

[bibonix]

@yegor256 this PR addresses #554 by adding PkMonoTest#linksEveryMotiveFileToALint, which walks every .md under src/main/resources/org/eolang/motives/ and asserts that the filename (without .md) is the name() of a lint produced by PkMono. Without this guard, motive files can drift from real lints — exactly what #554 calls out for motives/critical/same-line-names.md.

Summary of changes

• First commit adds the assertion (initially as MotivesAreUsedTest); it fails on master listing 11 orphan motive names (architect-duplicate, correct-package-meta, lt-incorrect-unlint, noname-attribute, object-does-not-match-filename, one-high-level-object, same-line-names, signed-binding-indexes, test-object-is-not-verb-in-singular, unit-test-without-live-file, zero-version).
• Second commit makes it pass:
  • rename motives/errors/lt-incorrect-unlint.md → motives/errors/incorrect-unlint.md, since LtIncorrectUnlint.name() is incorrect-unlint; update LtIncorrectUnlint.motive() to load the renamed resource.
  • delete the empty units/unit-test-missing.md and units/unit-test-without-live-file.md leftovers from 93e7006,
  • delete the documented-but-unimplemented motives critical/same-line-names.md, errors/noname-attribute.md, errors/signed-binding-indexes.md, metas/architect-duplicate.md, metas/correct-package-meta.md, metas/zero-version.md, misc/one-high-level-object.md, names/object-does-not-match-filename.md,
  • delete misc/test-object-is-not-verb-in-singular.md (the disabled LtTestNotVerb per the @todo in PkMono.java),
  • drop the .vale.ini override for the now-deleted same-line-names.md.
• Third commit moves the assertion into PkMonoTest so jtcop's RuleEveryTestHasProductionClass and RulePresentTense are happy (linksEveryMotiveFileToALint).

Test plan

• mvn -Dtest='PkMonoTest#linksEveryMotiveFileToALint' test passes against this branch.
• mvn -Pqulice -DskipTests install is green locally — no qulice violations.
• MotivesAreUsedTest against master (before commit 2) lists the 11 orphan names from the bug.
• LtIncorrectUnlintTest, LtAsciiOnlyTest, LintTest, WithoutLintsTest, MonoLintNamesTest continue to pass after the rename.
• No production code outside LtIncorrectUnlint.motive() references the renamed motive path.

CI status note

The mvn (ubuntu-24.04, macos-15, windows-2022), deep, and reserved jobs fail on this PR with MonoLintsTest.lintsProgramCorrectly and PkByXslTest.doesNotDuplicateDefectsWhenMultipleDefectsOnTheSameLine timing out at 45s — both pre-existing on master (#769) and on every PR (e.g. #862 was merged with the same matrix red), so they are not introduced by this change. ort also reports failure here for reasons I can't pinpoint from the action's truncated output (the action exits 2 minutes in with Process completed with exit code 1, no annotation text); the .ort.yml excludes are unchanged and reuse, qulice, vale, markdown-lint, pdd, xcop, typos, actionlint, yamllint, bashate, shellcheck, copyrights, labeler are all green. Happy to investigate further if you can share the run log.

[0crat]

@bibonix Thanks for the contribution! You've earned +12 points for this: +16 as a basis, +0.05 points per hit-of-code (capped at +16), and -4 for exceeding 100 hits-of-code (258 >= 100). Please keep them coming while being mindful of contribution size. Your running score is +198; don't forget to check your Zerocracy account too.