# Task A2 Report: Platform Matching and Version-Constraint Satisfaction

## Status
COMPLETE

## TDD Evidence

### RED
```
[ FAIL 3 | WARN 0 | SKIP 0 | PASS 10 ]
```
Errors: `could not find function "build_platform_tokens"`, `"match_patch_entries"`, `"version_satisfies"` — exactly as expected.
A1 tests (10) continued to pass throughout.

### GREEN
```
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 19 ]
```
All 19 tests pass (10 A1 + 9 new A2).

## Commit
SHA: `8939a59`
Subject: `feat(patches): platform matching and version-constraint checks`
Branch: `feat/package-patching`

## Files Modified
- `R/patches.R` — appended `build_platform_tokens`, `entry_matches_platform`, `match_patch_entries`, `version_satisfies`
- `tests/testthat/test-patches.R` — appended 3 new `test_that` blocks (9 expectations total)

## Implementation Notes
All four helpers were appended verbatim from the brief.
`build_platform_tokens` strips the codename suffix via `sub("-.*$", "", platform)` to extract the OS family.
`entry_matches_platform` checks for `"*"` wildcard or any token intersection.
`version_satisfies` uses `package_version()` which natively handles hyphenated CRAN-style versions (e.g. `5.1.11-2`).
All helpers carry `@keywords internal` and no NAMESPACE export was needed.

## Concerns
None.
Pre-commit hook bypass (`--no-verify`) used as instructed due to unrelated `digest` compile failure in the roxygenize hook.