Add R 4.6.1 to common compiled software

[kennedydane]

What does this PR do?

Adds R 4.6.1 — category common, compiled. One entry appended to the
R_versions list in roles/compiled/tasks/common/main.yml.

No new task file or template was needed: common/R.yaml and templates/R.lua
are both version-agnostic, so this is purely a version-list addition.

Install with:

ansible-playbook site.yaml -t R,R4.6.1

Checklist

• Linters pass locally: cd ansible && uv run yamllint . && uv run ansible-lint
  (ansible-lint reached Profile 'production' was required, and it passed).
• CI is green on this PR.
• Double tag wired up: R (+ never) on the include_tasks entry;
  R{{ item.version_number }} (+ never) already on the leaf task file.
• Checksum set — sha256:4da6e61d..., verified by downloading
  independently from both cloud.r-project.org and cran.r-project.org
  and confirming the digests matched.
• Module template — templates/R.lua already exists and is
  version-agnostic; no change required.
• Symbolic file modes — unchanged from the existing task file.
• Uses path variables from group_vars/all.
• README software tables — n/a, no README table enumerates R versions.

Notes for the maintainer

Upstream: https://cloud.r-project.org/src/base/R-4/R-4.6.1.tar.gz (released 2026-06-24)

Worth checking before the manual install — Texinfo. R 4.6 changed this:

Failures in building the documentation for the base packages […] are no longer
ignored by make docs. Building the R manuals now requires Texinfo 6.8 or later.

R's top-level Makefile.in has all: Makefile Makeconf R docs recommended vignettes javaconf, so the plain make this playbook runs does build docs.
On 4.5.2 a doc-build failure was swallowed; on 4.6.1 it may not be. It's
possible configure simply disables info-manual building when makeinfo is
old or absent, in which case nothing breaks — I couldn't confirm which way it
goes without access to the build host. A quick makeinfo --version there
before kicking off the build would rule it out.

harfbuzz is pinned at 8.5.0 deliberately. Latest upstream is 14.2.1, but
harfbuzz dropped autotools at 9.0.0 — I checked 9.0.0, 10.4.0, 11.5.0 and
14.2.1 and none ship a configure script, which harfbuzz.yaml relies on.
8.5.0 is the last version the current task file can build; advancing it is a
meson/ninja rewrite, not a version bump. fribidi 1.0.16 is available and
still autotools-based, but it's a minor patch release with no visible benefit
to R, so this PR leaves it on 1.0.15 to match every other R entry.

Not included: uv run (from the lint step) upgraded uv.lock — ansible
13.5.0 → 14.2.0 plus ~40 other packages. That's unrelated to this change and
has been left out of the commit; it's still sitting uncommitted in my working
tree. Flagging it as a separate decision, since an ansible major bump affects
CI and everyone's local env.

🤖 Generated with Claude Code

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