Cardano Updates

Pay down test coverage debt for Flat serialization instances.
This ensures encoding stability is verified by tests before
we attempt to fix the Generic derivation bug in a follow-up PR.

Adds roundtrip and stable byte encoding tests for:
- Flat library types (Maybe, Either, NonEmpty, Complex, Ratio,
  Set, Tree, Map, Seq, DList, Filler, PreAligned, and
  monoid/semigroup wrappers)
- TPLC types (Version, Name, Kind, DeBruijn, NamedDeBruijn,
  SrcSpan, SrcSpans, DefaultFun, DefaultUni, and all newtype
  wrappers including TyName, Unique, TyDeBruijn, etc.)
- PIR types (Recursivity, Strictness)
- UPLC types (Binder variants, FakeNamedDeBruijn, minimal
  Program encoding)
- Value types (K encodes as ByteString, Quantity as Integer)

Also adds a standalone encoding generator executable
(cabal run flat-encoding-generator) for reproducing expected
byte constants.

Rename testNewEncodings to testEncodingStability for clarity.
Fix plutus-core ^>=1.59 version bound to ^>=1.60. Remove
unnecessary -Wno-* flags and unused text dependency from
flat-encoding-generator. Improve executable comment with
golden testing context and Wikipedia reference.

Limit haddock parallelism to 2 jobs and use the already-defined HADDOCK_PACKAGES list instead of `all` to skip unnecessary targets. Add concurrency group to prevent overlapping builds and a 2-hour timeout as a safety net.

Rename intCasingEligible to constructorIndexesAreSequential to
describe what is checked rather than why. Inline single-use
intermediate bindings in the else branch and in
unsafeFromDataListClause for clearer data flow.

Eta-reduce mkListCreateExpr and remove redundant brackets
around the caseInteger application. Ignore remaining
false-positive "Redundant bracket" warnings on lambda params
in TH quotation (parens required by parser).

Remove file-wide editorconfig-checker-disable and wrap long lines.
Use FOURMOLU_DISABLE/ENABLE around CPP sections instead.