Fix USE/RUN dictionary shadowing: remove dead lib.4th aliases

capsules/lib.4th:13-14 defined ": USE ( addr u -- ) EXEC ;" and the
same for RUN, shadowing the C-registered mama_word_use()/RUN primitives
(CLAUDE.md names both, with BIRTH, as untouchable C primitives) with an
unrelated "load/exec a capsule" meaning. This broke the interactive
USE-based VM-redirect (S" Artemis" USE printed "EXEC: failed: Artemis"
instead of redirecting), discovered while chasing FABRIC-3.md's
live-MIGRATE verification.

Traced every real caller before touching anything: RUN's alias was
dead code, never called anywhere as bare RUN. USE's alias had exactly
one real caller -- capsules/hermes/init.4th:397, intentionally
exploiting the shadow to load common:msg.4th right after lib.4th
itself loaded. Both aliases were pure EXEC wrappers with zero added
behavior, so this deletes both definitions outright and switches the
one real call site (plus its matching doc comment in
capsules/common/msg.4th) to call EXEC directly. No new names invented,
the C primitives untouched.

Verified live: Hermes still births and her COMMON-CH-eviction
self-test (depends on common:msg.4th having loaded) still passes;
interactively, S" Artemis" USE now correctly redirects the REPL and
prints "USE: now using Artemis". mkcapsule --lint clean (31/31).
Clean compile and clean boot with Stadium conservation intact
(resident_sum + reservoir == Q48_ONE) on all three architectures.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CXjAPTEKrgY2Mrk25KoLDn

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