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feat(dialects): extract filament-used + slicer print-time estimate #183

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@sobechestnut-dev

Backlog candidate (2026-07-23 research pass) · area: dialects.

Extract filament used (length / weight) and the slicer's print-time estimate into metadata. These are standard "info panel" values that slicers emit as G-code comments. Verified this session: the dialect layer extracts bed / features / thumbnails / tools but not filament-used or time estimate.

Approach: per-slicer comment parsing in the dialect adapters (PrusaSlicer, Orca/Bambu, Cura, ...) surfaced via DialectMetadata and the state summary. Capability-honest: absent when the slicer doesn't emit it.

Bonus: a real slicer time estimate is the trustworthy source for the time-scrub feature (vs. the kinematic estimate).

Implementation gated by DD triage per project governance.

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