Records the runtime end-state: blaise embeds the RTL Pascal source once and
compiles it per --target on demand (selecting that target's TPlatformLayout +
kernel-stub adapter set), linking in-process — so a single binary cross-compiles
to any registered target with no blaise_rtl.a, no ar, no make install, and no
per-target .a files. The archive is documented as the transitional mechanism.
Adds an RTL-unification track to the migration sequence (gated on the .s→inline-
asm migration, which is in progress: blaise_atomic + blaise_setjmp done,
blaise_start + blaise_utf8 remaining). Compile-per-target adopted first;
in-memory/unit-cache RTL object cache deferred until build time is measured.
Reconciles the 'two selection moments' and FreeBSD Step 5 with the no-archive
end-state.
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