Add Eigenspace Tracking and HMC Utilities pages
Two new wiki pages, both wired into the Home.md table of contents.
Eigenspace-Tracking (under "QUDA Solver Acceleration Strategies"):
documents the eigenspace-tracking subsystem added in the feature/fgi_hmc
PR. Covers when ET pays off (HMC-style operator-changes-between-solves)
and when it does not (static gauge, non-MG-preconditioned regimes); the
three cooperating subsystems (tracker pool, MG null-vector refresh,
opt-in per-solve Krylov capture); the full --eigentracking-* CLI flag
table; an example light-mass HMC invocation; and the headline 4D
Wilson result --- 27% wall-clock saving on a 5-trajectory 24^3x48
m=-0.835 paired comparison, with iter inflation held to 1.07x vs the
no-ET 1.46x baseline. Also documents the four architectural invariants
that govern the per-solve GCR Krylov capture, each pinned by a
HMC.GCRTracker* regression test.
HMC-Utilities (under "QUDA Gauge Algorithms and Utilities"): documents
the HMC layer that was added as test infrastructure for ET. Opens with
a prominent status warning that this is a development tool only --- it
ships with verified force kernels for Wilson fermions only, and is not
suitable for production HMC. Production runs should continue to use
Chroma / tmLQCD / MILC + QUDA inverters. Catalogues what the layer
provides (4 integrators, EO Wilson force/action, MG re-setup
integration, ET hooks), the 12-test gtest suite, and the CLI parameter
groups; includes example invocations for regression testing,
per-link-force validation, and production-style trajectories. Closes
with an explicit list of what this is *not* (no clover/staggered/DWF/
twisted-mass force kernels, no multi-flavour, no smeared-link actions).
Updated Gauge Measurements links
add link to QUDA on Summit
added "openqxd with quda" to index page