fieldtest: milestone-research-artifacts corpus (GREEN) + Aura.toml data-key doc fix (F7)

MILESTONE VERDICT: GREEN — the whole span (0106-0109) holds end to
end as one continuous consumer scenario: authored from a bare {} via
introspection alone, every ref resolved from the public surface, three
validation tiers, run by content id over two real instruments through
the full v2 pipeline, realization recorded (selection/survivors/
bootstrap/generalizations/trace_name), traces on disk and charted,
read back via campaign runs, byte-identical re-runs (C1), refusals
precise. 0 bugs, 0 frictions, 0 spec gaps; 2 doc-gaps.

F7 fixed in this commit (the docs claimed an archive-root path without
naming the key; a guessed [paths] archive silently no-ops): project-
layout and the glossary Aura.toml entry now name [paths] data, and the
aura new template advertises the commented-out key. F8 (op-script
grammar not CLI-discoverable) filed as #208, sibling of the #197 docs
half — one docwriter pass once desired.

The milestone-close gate evidence is this corpus; the formal milestone
close and the push remain user-reserved.

refs #189

docs/glossary.md

@@ -17,7 +17,7 @@ The primitive `(frozen topology + param-set + data-window + RNG-seed) → determ
 
 ### Aura.toml
 **Avoid:** —
-The per-project declarative config holding only static context — paths only: the data archive root and the runs dir — never logic, and never instrument geometry (that is the recorded sidecar, C15). Its presence marks the project root, the way `Cargo.toml` marks a cargo crate.
+The per-project declarative config holding only static context — paths only: `[paths] data` (the archive root; defaults to the built-in path when unset) and `[paths] runs` (the runs dir) — never logic, and never instrument geometry (that is the recorded sidecar, C15). Its presence marks the project root, the way `Cargo.toml` marks a cargo crate.
 
 ### backtest
 **Avoid:** —