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Add @trails-cool/fit package with GPX→FIT Course encoder

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Wraps @garmin/fitsdk to emit FIT Course files from GPX, the binary
format Wahoo's POST /v1/routes API requires. Server-side only — the
~1 MB SDK never ships to the planner browser bundle.

Round-trip tests use fit-file-parser as an independent oracle and
assert lat/lon parity within 1e-4 deg and altitude within 0.5 m
across short flat, alpine, multi-day, and single-point fixtures.

Updates design.md decision #1: the original hand-rolled-encoder plan
was justified largely by ESM friction in the Garmin SDK, but as of
v21.202.0 the SDK is pure ESM with zero deps. Wrapping it saves us
~400 LOC of binary plumbing and ongoing maintenance against future
FIT spec updates.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Ullrich Schäfer 2026-04-30 22:31:37 +02:00
parent a45a3808d9
commit 8ba5554a67
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GPG key ID: A32FF691A0F752D9
18 changed files with 384 additions and 18 deletions
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apps/journal/package.json
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@ -21,6 +21,7 @@
"@trails-cool/api": "workspace:*",
"@trails-cool/db": "workspace:*",
"@trails-cool/jobs": "workspace:*",
"@trails-cool/fit": "workspace:*",
"@trails-cool/gpx": "workspace:*",
"@trails-cool/i18n": "workspace:*",
"@trails-cool/map": "workspace:*",