fix(ods): the generator is hucre, not the name the project used to have

[productdevbook]

Every ODS hucre has ever written says this in meta.xml:

<meta:generator>defter</meta:generator>

defter is what the project was called before it was renamed. The XLSX
writer has said hucre in docProps/app.xml's <Application> the whole
time, so the two writers disagreed about what produced the file, and one
of them was naming software that does not exist.

ODF §4.3.2.1 has meta:generator name the producing application —
LibreOffice records it on open, and it is the first thing asked for when a
document is reported as malformed. Anyone tracing a bad ODS back to its
producer had a name with no project behind it.

Why it lasted this long

The test that pinned it pinned it by name:

it("writes Application: defter in meta.xml", …)
  expect(getElementText(generator)).toBe("defter")

A rename sweep over the source finds defter in a string literal and
stops, because a test asserts it — the test looks like the requirement
rather than a copy of it. Renaming the test as well is the point: it now
says "names itself as the generator", which stays true through the next
rename.

The surviving Defters in src/errors.ts are the deliberate deprecated
DefterError alias and stay.

pnpm test green — 10,583 tests, 234 files. The ODS output still
validates against the OASIS grammar.

🤖 Generated with Claude Code