Rename build-results target to results-build

[jnasbyupgrade]

Summary

Follow-up to #109's review: the build-results target name was flagged as
too easily confused with the existing results target. Renames it to
results-build, updating every reference: base.mk's target/comments,
README.asc (+ regenerated README.html), CLAUDE.md, and the unreleased
HISTORY.asc entry.

Paired pgxntool-test PR

Postgres-Extensions/pgxntool-test#88 updates the make build-results call
sites in test/standard/make-test.bats (added by pgxntool-test#79) to
results-build, since those tests invoke the target by name.

Dependency note

This branches from fix-test-build-ordering (#109), which introduced
build-results in the first place. #109 has since merged to master, so
this PR is based on current master and should apply/test cleanly on its
own.

Test plan

• Full pgxntool-test suite (test-all) run against this branch paired
  with the corresponding pgxntool-test branch: 258/258 passing, including
  both results-build BATS tests (issue test-build doesn't gate installcheck: full suite runs before build sanity check #108's coverage, renamed in the
  paired PR).

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