(A) Carry forward unknown core keys in applyOverridesAfterSeeding
(CodeRabbit major). Mirrors collectModuleConfig's carry-forward so
the skip-collection path used by core (when seeded by --yes / legacy
shortcuts) doesn't drop unknown keys on subsequent installs. Without
this, `--set core.future=x` on run #1 would silently disappear on
the next install.
(B) --list-options now exits non-zero on a single-module miss
(CodeRabbit major). formatOptionsList returns { text, ok }; install.js
exits 1 with text on stderr when ok=false, 0 with text on stdout
otherwise. CI scripts catch typos like `--list-options bmn`.
(C) Hermetic Suite 44 discovery tests (CodeRabbit minor). Point
BMAD_EXTERNAL_MODULES_CACHE at a temp dir and restore in a finally
block so test results don't depend on the developer / CI cache state.
(D) Case-insensitive --list-options filter (Augment). Discovery
already dedupes case-insensitively; the filter now matches the same
way, so `--list-options BMM` and `--list-options bmm` both find the
bmm built-in.
Tests: +7 cases (uppercase listing, ok flag, core carry-forward).
Total 340 passing.
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