Separate Nota's tables from the upstream set

[henrikottesorensen]

Stacked on #9. This PR's base is that branch, so the diff and commit list below are only this change. GitHub will retarget it to main automatically when #9 merges.

Chain: #9 → #10 → #15 → #16

LibLouis.NET.Test/tables/ held thirty of Nota's Danish tables, while LibLouis.NET.Tables copies the upstream set into the same output directory. 22 of the 30 share a file name with an upstream table and differ from it, so which copy a test got depended on MSBuild item ordering — and nothing said so anywhere.

This moves them to nota-tables/, kept separate in the output, and points every test at that path.

Why it matters beyond tidiness

The shadowing has already cost real time. Running upstream's Danish braille specs against the wrapper failed 2,699 forward cases until they were redirected at an unshadowed upstream directory — the tables under test were Nota's, not the ones the specs were written for. With this change tables/ is pure upstream and can be checked against directly.

It also surfaced something worth knowing: Nota's tables are a fork of an older upstream, not a patch on the current one. They add what upstream lacks — the foreign emphasis class behind TypeForm.ForeignLanguage — and are missing what upstream has since fixed, such as the rules removing the space between § and a following number. da-dk-g2.dic diverges by 14,810 lines. Two files exist nowhere upstream, which is why the tests cannot simply use the upstream set.

Rebased onto #9, and why that way round

#9 adds ten test files that build paths from "tables", the directory this renames. Rebasing this onto #9 rather than the reverse means #9 needs no churn: this PR absorbs the mechanical path update across those ten files.

That also unblocked something. The first version of this PR deliberately shipped without a self-containment test, because adding a second test class to the assembly crashed the run on main:

Process terminated. A callback was made on a garbage collected delegate
of type 'LibLouis.NET!LibLouis.NET.NativeMethods+LoggingCallback::Invoke'.

That is #9's log-callback fix, item 5 of the audit — one more allocating test class was enough to trigger a GC and collect the unrooted delegate. On top of #9 it is gone, so both guards are included here.

63 tests pass on the combination.

Guards

• NotaTablesAreSelfContained — liblouis resolves an include relative to the directory of the table doing the including, so Nota's tables need the seven general upstream tables they include sitting alongside them. Those are copied from the staged upstream set rather than committed, so they cannot drift. The list is explicit in the csproj, and an explicit list goes stale the moment a table gains an include, so this asserts the closure holds.
• NotaTablesDoNotLeakIntoTheUpstreamDirectory — sharing a file name across the two directories is expected. What must not recur is both sets landing in one directory, so the tables that exist nowhere upstream act as the canary.

Nothing deleted

23 of the 30 are reachable from no test — a stale copy of the set the application ships, drifting independently of both upstream and production. They are kept and documented in nota-tables/README.md rather than deleted; deciding what is canonical isn't this change's business.

🤖 Generated with Claude Code

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Recreated from #10 to move the head branch onto Notalib/LibLouis.NET, which GitHub stacked PRs require (stacks cannot span forks).