Lane C: quantum graviton and BRST progression

The supplied account distinguishes X-E from X-F XE,XF,record.

X-E uses one matter tree and flat gauge fixing. The reported ${\kappa }^2$ held-fixed graviton defect is nonzero for that one-tree observable. This is an observable-specific boundary, not a universal no-go theorem.

X-F changes the gauge-fixing data to background de Donder gauge and uses three ${\hslash }^0$ trees. The supplied account reports closure of the all-tree identity through its stated order. The proposed outline truncates the sentence specifying that order, and the relevant formula is not reproduced. XV-A therefore records the tree grading but does not invent the coupling boundary.

These are distinguishable signatures even when they belong to a research progression. The one-tree defect and the all-tree closure need not contradict one another: they refer to different assembled observables and gauge-fixing data. Neither statement, as supplied, constructs an interacting quantum BRST/BV differential or a one-loop coefficient. No later X-series BRST release is added to this ledger without its source statement.