C4: committed builder for the evidence-layer claim feature matrix

Every pre-2026-07-31 aggregate in this program came from ephemeral
scratchpad code and is unreproducible from the repo. This is the
reproducible builder for the C4 matrix: one row per archived composed
claim over the CA/US grounding lane (stages 1-13), every deterministic
lint witness a column, citator columns (citer count, cited court level,
stands-for tier) joined per cited key from the local noteup graph.

Zero model calls. The lint is recomputed offline against the same
jurisdiction-matched alienness index and the same benchmark question
text the runs used. Instrument oracle: the 121 Stage 7 claims that
archived their own lint receipts reproduce bit-exactly (max abs delta
0.0 on all nine features).

Labels are checker-derived and carry the measured 0-13% flip rate; the
cell-level and C2-propagated claim-level labels are emitted as separate
columns, and Stage 7's lint_gated arm is tagged lint_in_loop because its
archived claim text is post-revision.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H9ToHYJVDxfeJcJwdzrP2H