The --macd flag was a back-compat alias for --harness macd, added in cycle 0065
iter-3 while the uniform `--harness <name>` selector was introduced. With that
selector in place the alias is pure redundancy, so drop it: --harness <name> is
now the sole way to pick a built-in harness.
Removed from parse_run_args: the macd_flag accumulator, its match arm, and the
(harness, macd_flag) conflict resolution -- harness selection collapses to
`harness.unwrap_or(HarnessKind::Sma)`. Both usage strings drop `[--macd]`; the
parse_run_args doc and the parse_real_args note no longer cite the flag.
The MACD harness itself is untouched: run_macd, the macd() composite, and
`--harness macd` all stay. Tests updated -- the alias test becomes a positive
`--harness macd -> Macd` test plus an assertion that `--macd` is now rejected as
an unknown token; the "repeated --macd" edge is dropped (the flag is gone, and
repeated-flag strictness is still covered by --harness/--trace).
INDEX.md: the two realization notes that documented `--macd` as a live run form
updated (`aura run [--real ...]`; `run --harness macd`). The historical
graph-viewer retirement note and the frozen fieldtest capture are left as the
record of their time.
Verified: clippy --all-targets -D warnings clean; full suite 513 passed / 0
failed (assertions rewritten in place, no test count change); live smoke --
`aura run --harness macd` emits a RunReport, `aura run --macd` exits with the
updated usage.
Brummel
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