Add tissue weight normalization to glycogen assay analysis

[Copilot]

Glycogen/glucose results were reported as absolute concentrations (µg/µL in undiluted homogenate) with no normalization to tissue weight, making cross-sample comparisons biologically meaningless given the 7–50 mg sample weight range.

Approach

Normalization formula applied to all production assay Rmd files:

normalized = (dilution_factor × measured_conc × homogenate_volume_uL) / tissue_weight_mg
# homogenate_volume_uL = 1000 (750 µL PBS/HCl + 250 µL TRIS, per protocol)
# tissue_weight_mg extracted from plate layout label: "C7-glyc-35-df.50" → 35 mg

Changes (Gen5-20260123 through Gen5-20260218, 8 files)

• Data chunk: Load 20251210-mgig-ctenidia_weights-glycogen_assay.csv; define homogenate_volume_uL <- 1000
• Helper function: get_weight_from_label() — extracts weight from embedded plate layout label format <sampleID>-<type>-<weight>-df.<dilution>
• Summary tables: Added 5th column Normalized glycogen (ug/mg tissue) and Normalized glucose (ug/mg tissue) to existing 4-column matrices (dilution factor, luminescence, calculated conc, total conc)
• Label fixes: Corrected pre-existing column header bugs in 20260123/20260126/20260130 glucose tables (mislabeled as uM or Calculated Glycogen)

Original prompt

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This section details on the original issue you should resolve

<issue_title>How is glycogen assay being normalized?</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes How is glycogen assay being normalized? #1

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