Add chlog CLI with chcat/chtail/chgrep entrypoints

Single Go binary for the ClickHouse log store (logs.raw): chlog with
cat/tail/grep subcommands, plus chcat/chtail/chgrep argv[0]-dispatched
symlink entrypoints. Every query is time-bounded and fully parameterized;
chgrep guards wide unfiltered scans. Ships nfpm RPM with completions and
woodpecker PR/tag pipelines mirroring node-lookup.

scripts/build-rpm.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+#
+# Package the (already built) chlog binary into an RPM with nfpm, bundling
+# chcat/chtail/chgrep symlinks and generated bash/zsh/fish shell completions.
+# Usage: scripts/build-rpm.sh [version]   (version defaults to $CI_COMMIT_TAG)
+#
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "${ROOT_DIR}"
+
+VERSION="${1:-${CI_COMMIT_TAG:-0.0.0-dev}}"
+VERSION="${VERSION#v}" # strip a leading v
+BINARY="chlog"
+NAMES=(chlog chcat chtail chgrep)
+DIST="dist"
+
+if [ ! -f "${DIST}/${BINARY}" ]; then
+  echo "ERROR: ${DIST}/${BINARY} not found; run 'make build' first" >&2
+  exit 1
+fi
+
+for l in chcat chtail chgrep; do
+  ln -sf "${BINARY}" "${DIST}/${l}"
+done
+
+# Generate shell completions per entrypoint name so they always match the
+# shipped flags/subcommands (each name dispatches to its own command tree).
+COMP_DIR="${DIST}/completions"
+mkdir -p "${COMP_DIR}"
+for b in "${NAMES[@]}"; do
+  "./${DIST}/${b}" completion bash >"${COMP_DIR}/${b}.bash"
+  "./${DIST}/${b}" completion zsh >"${COMP_DIR}/_${b}"
+  "./${DIST}/${b}" completion fish >"${COMP_DIR}/${b}.fish"
+done
+
+export PACKAGE_NAME="clickhouse-tools"
+export PACKAGE_VERSION="${VERSION}"
+export PACKAGE_RELEASE="1"
+export PACKAGE_ARCH="amd64"
+export PACKAGE_PLATFORM="linux"
+export PACKAGE_DESCRIPTION="CLI tools for the ClickHouse log store: chlog with chcat (print), chtail (follow) and chgrep (search) entrypoints"
+export PACKAGE_MAINTAINER="Ben Vincent <ben@unkin.net>"
+export PACKAGE_HOMEPAGE="https://git.unkin.net/unkin/clickhouse-tools"
+export PACKAGE_LICENSE="MIT"
+
+envsubst <packaging/nfpm.yaml >"${DIST}/nfpm.yaml"
+nfpm pkg --config "${DIST}/nfpm.yaml" --target "${DIST}" --packager rpm
+
+echo "Built:"
+ls -1 "${DIST}"/*.rpm