fix security.md + dedupe gen5 byte readers

[abdulsaheel]

security.md was copy-pasted from edge and referenced a "README" section on sideloading/rooted devices that this repo's README never has (this is a pure-dart lib, no app, no store builds, no firebase). rewrote it for what this repo actually is and pointed app-distribution/privacy stuff at edge's own docs.

also deleted the hand-rolled _u16/_i16/_u32 in gen5_records.dart — the file already has a _view() ByteData helper used everywhere else for endian reads, no reason for a second one.

ran the gen5 tests + full suite, all green.

Summary by Sourcery

Clarify the package security boundary and remove redundant Gen5 byte-reading helpers.

Enhancements:

• Align the security policy with this repository’s pure-Dart library scope and direct app-level security and privacy concerns to the edge project.
• Consolidate Gen5 record integer decoding around the existing endian-aware byte-view helper.

Documentation:

• Update SECURITY.md to define the package-specific security scope and exclusions.

Tests:

• Run the Gen5 tests and full test suite successfully.

[sourcery-ai]

Reviewer's Guide

Updates the security policy to accurately scope this pure-Dart decoding library and removes duplicated Gen5 byte-reading helpers by using the existing ByteData path, with behavior-preserving little-endian decoding.

File-Level Changes

Change	Details	Files
Reworked the security policy to describe this repository’s actual pure-Dart library scope and defer app-level concerns to the dependent application.	Added the package architecture and non-networked/non-storage boundaries. Narrowed in-scope reports to exploitable malformed-byte decoding and unintended command transmission. Removed app-specific data, distribution, telemetry, and backend guidance and linked the relevant edge documentation.	SECURITY.md
Unified Gen5 optical field decoding around the existing endian-aware ByteData helper.	Replaced the local unsigned and signed integer readers with _view(...).getUint16/getInt16/getUint32 calls. Deleted the redundant hand-rolled reader implementations while preserving little-endian offsets and signedness.	lib/src/gen5_records.dart

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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.