DEV-875 Generalise the non-wear derived-sensor bit to the LSM6DS family (LSM6DSX)

[marknolan]

Stacked on #277 — merge that first, then retarget/merge this. Jira: DEV-875.

Renames DerivedSensorsBitMask.NON_WEAR_DETECTION_LSM6DS3 to NON_WEAR_DETECTION_LSM6DSX (same bit, 1<<1) so a single non-wear algorithm variant can cover both the gen-1 LSM6DS3 and the gen-2 LSM6DSV:

• The two IMUs never coexist on one board (gen-1 vs gen-2), so the shared bit is unambiguous; the LIS2DW12 keeps its own bit 0.
• The Verisense derived-sensors mask is an in-process enable key that is never persisted — payload/op-config bytes carry the enabled-sensors bitmap only, the cloud RDS stores non-wear results without a bitmask column, and the frozen "must not change" contract applies only to the separate Shimmer3 namespace (infomem/SD headers).
• A @Deprecated alias keeps source compatibility for consumers of the published jar.

The algorithm-side change (merged ALGO_NON_WEAR_DETECTION_LSM6DSX with SENSOR_CHECK_METHOD.ANY) is in the companion ASM_PC PR on branch DEV-875_lsm6dsv_nonwear.

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[Copilot]

Pull request overview

Generalises the Verisense derived-sensors bitmask for non-wear detection so the same enable bit can be used across the LSM6DS IMU family (gen-1 LSM6DS3 and gen-2 LSM6DSV), while preserving source compatibility via a deprecated alias.

Changes:

• Rename DerivedSensorsBitMask.NON_WEAR_DETECTION_LSM6DS3 to NON_WEAR_DETECTION_LSM6DSX (same bit: 1 << 1).
• Add JavaDoc clarifying the shared-bit rationale and introduce a @Deprecated alias for the old constant name.

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[jyong15]

Closing as superseded. The DEV-875 driver-side change already landed on master via a different design: commit 0381fe4 (part of #277, merged 2026-07-17) keeps NON_WEAR_DETECTION_LSM6DS3 = 1<<1 untouched and adds a separate NON_WEAR_DETECTION_LSM6DSV = 1<<10, rather than unifying the family under one LSM6DSX bit as this PR does. This branch was cut one commit before 0381fe4, which is why the overlap went unnoticed.

The two designs can't coexist: this PR auto-merges into master cleanly (verified with git merge-tree — no conflict, no compile error), producing two different bits both documented as the gen-2 non-wear bit. So it needs to be closed rather than left open, since nothing mechanical would catch an accidental merge.

Worth recording from review before closing:

• The unified-bit premise ("LSM6DS3 and LSM6DSV never coexist on one board") doesn't hold at the driver's compat layer — svoVerisenseImu (SR61) appears in both listOfCompatibleVersionInfoLSM6DS3 and ...LSM6DSV (Configuration.java:2720/2742), so a SENSOR_CHECK_METHOD.ANY variant can't tell which IMU's non-wear is enabled on SR61. The separate-bit design on master doesn't have this ambiguity.
• The rename itself was verified behaviour-neutral: NON_WEAR_DETECTION_LSM6DS3 has no consumer anywhere in this repo, and the constant is compile-time-inlined, so already-built consumers are unaffected either way.

Companion ASM_PC PR ShimmerResearch/ASM_PC#354 is being closed for the same reason — the consumer-side port landed on ASM_PC main via d0011b1.

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