round 2 fixes: r10 ts_epoch, dead node files, pow10 dedupe

[abdulsaheel]

few more from the audit pass:

• r10-live decode was still missing ts_epoch even though the comment right above it claimed the fix already covered timestamps. added it, matches what compact-hr and r24 already emit.
• deleted package.json/package-lock.json/tsconfig.json — leftover node scaffolding from before the ts/ folder got deleted, nothing references them.
• readme said dart test runs 71 tests, it's actually 432 now. just made it not call out a number so it stops going stale.
• _pow10 was hand-rolled in two files even though dart:math is already a dep elsewhere in the package. swapped both for math.pow.

Summary by Sourcery

Align r10 realtime decoding with other record formats and clean up obsolete project support files.

Bug Fixes:

• Include epoch timestamps in decoded r10 realtime heart-rate records.

Enhancements:

• Replace duplicated power-of-ten helpers with dart:math and remove obsolete TypeScript project scaffolding.

Documentation:

• Update the README test command to avoid a stale test-count reference.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This cleanup pass fixes the missing timestamp in R10 live decoding, standardizes rounding scale calculation on dart:math, removes unused TypeScript/Node scaffolding, and makes the test command documentation count-independent.

Sequence diagram for R10 live timestamp decoding

sequenceDiagram
    participant Decoder
    participant R10Record
    Decoder->>R10Record: parseR10(...)
    R10Record-->>Decoder: tsEpoch
    Decoder-->>Decoder: Decoded realtime_hr with ts_epoch

Loading

File-Level Changes

Change	Details	Files
Align realtime HR decoding with the timestamp fields emitted by other record formats.	Add ts_epoch from the parsed R10 timestamp to realtime_hr decoded output.	lib/src/control.dart
Replace duplicated power-of-ten helpers with the standard math implementation while preserving existing rounding behavior.	Import dart:math and compute scaling factors with math.pow in both rounding implementations. Remove the local _pow10 helpers.	lib/src/control.dart lib/src/records.dart
Remove obsolete TypeScript project scaffolding from the Dart-only package.	Delete unused Node package metadata and TypeScript compiler configuration.	package.json package-lock.json tsconfig.json
Prevent the README test-count documentation from becoming stale.	Describe dart test as running the full suite without hard-coding the current test count.	README.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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[abdulsaheel]

squashed into #42 for one clean review — closing this round.