feat(train): music by cadence in a recording, or the metronome (ADR 0030, D48)

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A workout keeps its cadence as a series of its own (steps a minute, every
10 s while moving). The Record sheet offers Music, Metronome or Off on
foot, remembered; Music once a kept track has a tempo. The recorder
measures the cadence over the last 30 s and plays a fitting track (its
tempo, half or double, within 6 %) through Media3's ExoPlayer, retuning
the track playing where it still fits, else crossfading over 3 s; a
plan's new step picks anew. A run starts at the cadence learnt from the
person's runs, which also gives a plan's steps their cadence.

Media3 1.10.1, pinned by Gradle's checksums (trusted on first download
from Google's Maven, 29 Oct 2026), for review:
  media3-common     aar 39686f54ff6baf8cbc841199afd55619533eaef2ab6cd0efc32b8a3c55dd88c3
                    module a81b2f0ebc256fe0e09f05d93c5259ade5bf44707748b9295343bee67575d9c2
  media3-container  aar a198b62c577fa434941282fbfa31eb66ff0ff308a6573edf0b5dd01f4e38445d
                    module e2a1c62c7e5d1013b906bc6ff5056db3e797cda4505e2d7d229524b24ca67a0e
  media3-database   aar 520e6f814e42a7d428db187ac073b453c0fcba0f4f5f4edd1cf33fafd2cfb740
                    module c380fea161e80d8074215a20e86e3dc2c2d825de964ca87aee66c8331f5ae252
  media3-datasource aar e22f9f779047ce951152c793af094593e7cbb52475a82d56fa4f869fd319e700
                    module 9d32d2ec6a983ee9f418bcc05777aa23eee4db37bf794f44fb66a05d6f22e963
  media3-decoder    aar a9fb2b8fa1d54b4a8d6bda98a1c655b04d59c74b3ace7e2503e9e39830f13aee
                    module 388d5226366edd1facf8eec42cb5420871a46032d545286e90eaea8454789580
  media3-exoplayer  aar 19090f829afbbb595d67618f59c212f72b433ac01dc72b47594cf42552c8ed61
                    module ba0b9ef325fa114baa0f2fbdb4caf54029606924be1999f4af02bed5f079756b
  media3-extractor  aar 3c823279356b64f4215a8c6cb1e6bfa60c533351a651786ad6fa69ad001ef1b1
                    module b3eb755d7373e4fd199ff80814005f3b303693dfb8ace16b5b9482655d49d493

Not tried on a phone yet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

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Tizian 「ティツィアーン」 2026-10-29 13:31:41 +01:00

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commit d5b367e930

Signed by: raisondetredev

GPG key ID: 07F6FCF405488B64

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