docs: add stdmath keyword to chebyshev-series and chebyshev-seriesf in math/base/tools

[Planeshifter]

Description

What is the purpose of this pull request?

This pull request:

• Inserts the stdmath keyword and reorders the leading keywords entries in two math/base/tools packages so the prefix matches the rest of the namespace: ["stdlib", "stdmath", "mathematics", "math", ...].

Namespace summary

• @stdlib/math/base/tools: 17 non-autogenerated members.
• Features analyzed: file tree, package.json shape (top-level keys, scripts, keywords), manifest.json shape, README section list/order, test/benchmark/example file naming, and (inline) semantic surface — public signature, validation prologue, error construction, JSDoc shape, dependencies.
• Features with a clear (≥75%) majority that produced an actionable correction: keywords prefix sequence (15/17 = 88.2%).
• Features with a clear majority but no actionable outliers: every universal file (README.md, lib/index.js, package.json, test/test.js, benchmark/benchmark.js, examples/index.js, docs/types/index.d.ts, docs/types/test.ts); 18 universal package.json top-level keys.
• Features without a clear majority (excluded): README h2 set order (Notes 12/17 = 71%; See Also 6/17), test/benchmark file naming (multiple sub-majority subsets corresponding to the namespace's three sub-architectures: polynomial evaluators, compile helpers, series tools).
• Features with majority deviations gated out: lib/main.js absent in continued-fraction and sum-series (intentional basic.js + generators.js architecture for generator/non-generator paths); docs/repl.txt absent in the four *-compile* packages (88.1% stdlib-wide presence — below the 90% gate).

math/base/tools/chebyshev-series

The keywords array begins ["stdlib", "math", "mathematics", "chebyshev", ...] — the rest of @stdlib/math/base/tools (15/17 = 88.2%; @stdlib/math/* overall: 665/684 = 97.2%) leads with stdlib/stdmath/mathematics/math. Package was added in #11470 and the stdmath discoverability marker was missed at authoring; aligning the prefix here matches what every sibling already does. No source, tests, examples, or REPL fixtures touched.

math/base/tools/chebyshev-seriesf

Single-precision sibling carries the same omission verbatim — same rationale, same fix. The two packages were authored together; the divergence is mechanical, not intentional.

Validation

• Structural extraction over 17 packages: file tree, package.json shape, README sections, test/bench/example names.
• Semantic surface inspected inline (no per-package agent fan-out needed): every package in the namespace carries no throw and no @stdlib/assert/* validation imports — math/base/* is the unvalidated fast-path tier — so validationPrologue, errorConstruction, and related semantic features are trivially universal-empty.
• Three-agent advance criteria: structural-review agent (sonnet) returned confirmed-drift for both outliers; cross-reference agent verified that no test, example, README claim, or _tools/lint/pkg-json schema constrains keyword content/order beyond presence-of-stdlib and the global character-set rule, and that the files are not generator output.
• Cross-run dedup: no open PR proposes this fix; feat: add math/base/tools/chebyshev-series #11470 (the package add) and docs: correct JSDoc return value in math/base/tools/chebyshev-seriesf #11584 (a follow-up doc fix on chebyshev-seriesf) merged outside the 14-day window.

Deliberately excluded

• Intentional architecture deviations (continued-fraction, sum-series lacking lib/main.js).
• The four *-compile* packages lacking docs/repl.txt — below the ≥90% stdlib-wide gate.
• README Notes and See Also sections — sub-threshold in this namespace; the See Also block is auto-populated regardless and outside the routine's scope.
• All non-keywords features that already conform on every member.

Related Issues

Does this pull request have any related issues?

No.

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request?

Total diff: 4 insertions / 2 deletions across 2 files, both package.json. Each outlier receives a single keywords prefix change and no other modifications. No commits touch source, tests, examples, types, or generated artifacts.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• 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

This PR was authored by Claude (Opus 4.7) running a cross-package drift-detection routine: a randomly-picked namespace (@stdlib/math/base/tools, seed 1818300874) was scanned for structural and semantic drift against a 75% majority threshold, candidate corrections went through pre-validation gates and a multi-agent advance check (sonnet structural-review and cross-reference review, both confirmed-drift), and only the surviving mechanical metadata fix was applied. I reviewed the verdict, the gating decisions, and the diff before submission.

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@stdlib-js/reviewers

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Generated by Claude Code

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/tools/chebyshev-series	$\color{green}280/280$ $\color{green}+100.00%$	$\color{green}20/20$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}280/280$ $\color{green}+100.00%$
math/base/tools/chebyshev-seriesf	$\color{green}300/300$ $\color{green}+100.00%$	$\color{green}20/20$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}300/300$ $\color{green}+100.00%$

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