Fix code-review findings: 10-known.sh value-match bug (proven live), bootstrap.sh symlink race + missing sources + accidental exit-on-eval, fx.sh misleading picker text + FX_AUTO short-circuit

contrib/fx/sources.d/10-known.sh

@@ -2,8 +2,21 @@
 # Fuzzy-known source: surfaces fixes already taught for a command that
 # *starts the same way* as this one, since f()'s own p lookup only ever
 # matches the exact, literal string.
+#
+# Matches only against the KEY (left of "="), not the whole line -- an
+# earlier version used `grep -F "$first_word " p`, which also matched
+# inside a fix's *value*. Proven wrong live: with p containing
+# `gti --version=gti(){ command git "$@"; }`, querying "git push" (never
+# taught) matched that line anyway, because "git " appears inside the
+# value text, not because the key is related.
 [ -f p ] || exit 0
 cmd="$1"
 first_word=$(printf '%s' "$cmd" | awk '{print $1}')
 [ -n "$first_word" ] || exit 0
-grep -F "${first_word} " p 2>/dev/null | cut -d= -f2- | awk '!seen[$0]++'
+awk -v fw="$first_word " '
+    substr($0, 1, length(fw)) == fw {
+        line = $0
+        sub(/^[^=]*=/, "", line)
+        if (!seen[line]++) print line
+    }
+' p 2>/dev/null