chore(desc): R floor 3.5.0, ByteCompile, Suggests metadata (#58)

[davidbudzynski]

Closes #58 (metadata part).

Changes:

• DESCRIPTION: Depends: R (>= 3.5.0) (was 3.1.0, matches src/kit.h:19-22 DATAPTR_RO fallback; ...length() in R/call.R, R_RegisterCCallable in src/init.c:39-66, STRING_PTR_RO need newer), ByteCompile: yes per WRE (was TRUE), drop Repository: CRAN from dev tree, add Config/Needs/website: pkgdown.
• DESCRIPTION: add David Budzynski as ctb in Authors@R/Author (Maintainer stays Sebastian Krantz — R allows only one Maintainer).
• Suggests unchanged (already data.table, knitr, rmarkdown, tibble, tinytest — verified via rg: data.table/tibble used in inst/tinytest/test-enc.R, tinytest in tests/tinytest.R, knitr/rmarkdown in vignette). No Config/testthat/edition (tinytest, not testthat) or RoxygenNote (hand-written Rd).
• NEWS.md: note under development version Notes.

WRE refs (https://cran.r-project.org/doc/manuals/r-release/R-exts.html#The-DESCRIPTION-file):

• ByteCompile is a logical field — canonical values yes/true/no/false (capitalized accepted). TRUE works, yes is the standard form, so normalized.
• Repository: Built/Packaged must not be in source (added by tools), and 'Some repositories (including CRAN...) add their own fields.' Repository: CRAN is added by CRAN on publish, so removed from dev tree.

Why 3.5.0 not 4.x:

• Keeps src/kit.h:29-31 isDataFrame shim for R<4.5. Bumping to >=4.5 to drop shim would break CI oldrel-4 (~4.2). Leave for later with matrix trim.
• CI matrix oldrel-1..4 + release + devel all satisfy >=3.5, no workflow change.

Verification:

• R CMD build: DESCRIPTION meta-information OK (including after author addition).
• R CMD check --as-cran --no-manual --no-build-vignettes (R 4.6.1 macOS): DESCRIPTION OK, dependencies OK, tests OK, no metadata NOTEs. Remaining 3 WARNINGs + 1 NOTE are env-only (missing pandoc/checkbashisms, inst/doc absent due to --no-build-vignettes).
• Investigation details posted to chore(desc): R version floor, ByteCompile, Suggests #58 as comment.

Branch from master @ 4d1d79d.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.27%. Comparing base (99413b6) to head (0615a3b).
⚠️ Report is 71 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   98.01%   98.27%   +0.26%     
==========================================
  Files          13       13              
  Lines        5083     5105      +22     
==========================================
+ Hits         4982     5017      +35     
+ Misses        101       88      -13     

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