Self-healing autopoietic shell: f(), tests, docs, interactive demo, fx fix-source layer

contrib/fx/sources.d/90-team-shared.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+# EXAMPLE custom source -- a template, not a real dependency. This is
+# the entire extension mechanism demonstrated: any executable dropped
+# into sources.d/ following the contract in fx.sh is picked up
+# automatically, no registration step anywhere else.
+#
+# Pulls a team-shared p-format corrections file and offers exact-key
+# matches. Off by default (no-ops unless FX_TEAM_URL is set) because a
+# match here becomes eval'd code the moment you select it -- point this
+# at a URL you trust the same way you'd trust an rc file, never a
+# random link.
+[ -n "$FX_TEAM_URL" ] || exit 0
+cmd="$1"
+[ -n "$cmd" ] || exit 0
+curl -fsSL "$FX_TEAM_URL" 2>/dev/null | grep -F "${cmd}=" | cut -d= -f2-