chore: add missing precision keywords

[Planeshifter]

Description

Follow-up fixes for commits merged to develop between 2026-06-06 14:40 PDT (f2640a213) and 2026-06-07 04:02 PDT (86dc341d3).

Two new complex-precision BLAS extension packages landed without the precision keyword that every sibling carries:

blas/ext/base

• caxpby/package.json — Fix db04ac04 (blas/ext/base/caxpby/package.json): "single" was missing from the keywords array, inconsistent with sibling single-precision packages saxpby and caxpy; appended "single" after "float32".
• zaxpby/package.json — Fix 2aa1270d (blas/ext/base/zaxpby/package.json): "double" was missing from the keywords array, inconsistent with sibling double-precision packages daxpby and zaxpy; appended "double" after "float64".

Related Issues

None.

Questions

None.

Other

Validation

Reviewed all 33 commits merged to develop in the window for typos, bugs, and style-guide violations. The audit was performed by four independent reviewer agents (two style, two bug) on top of a shared change summary.

• Checked: stdlib code style compliance against sibling reference packages; JSDoc/REPL/TypeScript declaration consistency; obvious bugs (off-by-one, swapped operands, copy-paste errors, complex-number real/imag handling); security and incorrect-logic concerns in the introduced C and JS kernels.
• Deliberately excluded: subjective polish, anything requiring interpretation, "could be improved" suggestions, anything that would require touching code outside the diff window to validate, drift in auto-generated namespace ToC / REPL data.csv / data.json files, and intentional patterns like the mass zeros → empty benchmark setup change.

False positives that were considered and dropped:

• array/falses/lib/main.js JSDoc @param default — actual file already reads [dtype="bool"]; agent misread the source.
• dcunone/src/main.c missing const on offset locals — the const vs no-const pattern is mixed across blas/ext/base C sources (81 vs 30 occurrences), so this is not an unambiguous style violation.
• swxsa/src/main.c using literal 5 instead of static const CBLAS_INT M = 5 — sibling sapx (closest single-precision in-place unrolled-loop kernel) uses the literal as well, so the family pattern is not uniform.

Checklist

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

Drafted by Claude Code as a follow-up audit of the last 24 hours of commits to develop. Independent style and bug reviewer agents produced a candidate finding set; each surviving finding was manually re-verified against the relevant sibling reference packages before being applied. PR left in draft for human maintainer audit.

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@stdlib-js/reviewers

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/caxpby	$\color{green}494/494$ $\color{green}+100.00\%$	$\color{green}32/32$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}494/494$ $\color{green}+100.00\%$
blas/ext/base/zaxpby	$\color{green}494/494$ $\color{green}+100.00\%$	$\color{green}32/32$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}494/494$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.