ciflow/torchtitan/186479: Fix #135011: avoid recompiles for dynamic Parameter inputs

Honor explicit mark_dynamic annotations on Parameter inputs and
normalize Tensor/Parameter guarding so they can share compiled code
when their metadata matches.

Also avoid singleton-size specialization in the affected symbolic,
broadcast, and contiguity helper paths so min=0 and shape (1, 1)
do not trigger extra recompiles. Add regression tests for the
reported Parameter and open-ended dynamic range cases.