rename the project to khosra, initialise the module

Naming is free before a module is published, a URL is shared, or a binary is
deployed; every day it waits costs more. Swept every form: module path, binary,
cmd/ directory, KHOSRA_SITE, the feature-loop skill directory, and the prose in
earlier ADRs — which describe this project under its old name, not a different
project. Recorded as ADR-0030.

go mod init lands here rather than with the first feature because the module
path is what the rename is about. x/text and yaml.v3 are required but not yet
imported, so both are indirect and no direct dependency is claimed yet.

scripts/verify.sh

@@ -333,7 +333,7 @@ longfuncs=$(echo "$gofiles" | xargs awk -v m="$FUNC_LOC_WARN" '
 if [ -f Dockerfile ] && [ "${VERIFY_DOCKER:-0}" = "1" ]; then
   head_ "container (VERIFY_DOCKER=1)"
   if command -v docker >/dev/null 2>&1; then
-    if docker build -q -t atelier:verify . >/tmp/docker.log 2>&1; then
+    if docker build -q -t khosra:verify . >/tmp/docker.log 2>&1; then
       pass "docker build"
     else
       bad "docker build"; tail -20 /tmp/docker.log | sed 's/^/        /'