* Fix Axolotl ReLoRA optimizer reset scope
* fix: make relora reset method honor relora_prune_ratio
When relora_prune_method='reset' and relora_prune_ratio is explicitly
set, the ratio was silently ignored and replaced with the hardcoded
_FULL_RESET_RATIO (0.999). Fix by moving the default-ratio logic to
ReLoRACallback.on_step_begin: None maps to _FULL_RESET_RATIO for reset
and 0.9 for other methods. reset_optimizer now uses the same random
pruning path for both 'random' and 'reset'.
Also consolidate three-layer default mismatch: schema default for
relora_prune_method is now 'magnitude' (single canonical source);
dataclass defaults for both fields changed to None to eliminate the
conflicting fallback layer.
Tests updated: removed the test case that verified the old broken
behavior (reset ignoring ratio), added two cases proving reset honors
the passed ratio. E2E reset fixture now uses ratio=0.5 to make it
unambiguous that the ratio is honored.
* Fix ReLoRA uint8 pruning regression
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Signed-off-by: Wing Lian <wing@axolotl.ai>
Co-authored-by: Axolotl Swarm <no-reply@axolotl.ai>
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