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.

packaging/nfpm.yaml

@@ -0,0 +1,86 @@
+# nfpm config for the clickhouse-tools RPM.
+# Rendered through envsubst (see scripts/build-rpm.sh) then fed to `nfpm pkg`.
+
+name: ${PACKAGE_NAME}
+version: ${PACKAGE_VERSION}
+release: ${PACKAGE_RELEASE}
+arch: ${PACKAGE_ARCH}
+platform: ${PACKAGE_PLATFORM}
+section: default
+priority: extra
+description: "${PACKAGE_DESCRIPTION}"
+
+maintainer: ${PACKAGE_MAINTAINER}
+homepage: ${PACKAGE_HOMEPAGE}
+license: ${PACKAGE_LICENSE}
+
+disable_globbing: false
+
+contents:
+  - src: dist/chlog
+    dst: /usr/bin/chlog
+    file_info:
+      mode: 0755
+      owner: root
+      group: root
+
+  # chcat/chtail/chgrep dispatch on argv[0] inside the chlog binary.
+  - src: /usr/bin/chlog
+    dst: /usr/bin/chcat
+    type: symlink
+  - src: /usr/bin/chlog
+    dst: /usr/bin/chtail
+    type: symlink
+  - src: /usr/bin/chlog
+    dst: /usr/bin/chgrep
+    type: symlink
+
+  # Shell completions (generated by scripts/build-rpm.sh before packaging).
+  - src: dist/completions/chlog.bash
+    dst: /usr/share/bash-completion/completions/chlog
+    file_info:
+      mode: 0644
+  - src: dist/completions/_chlog
+    dst: /usr/share/zsh/site-functions/_chlog
+    file_info:
+      mode: 0644
+  - src: dist/completions/chlog.fish
+    dst: /usr/share/fish/vendor_completions.d/chlog.fish
+    file_info:
+      mode: 0644
+  - src: dist/completions/chcat.bash
+    dst: /usr/share/bash-completion/completions/chcat
+    file_info:
+      mode: 0644
+  - src: dist/completions/_chcat
+    dst: /usr/share/zsh/site-functions/_chcat
+    file_info:
+      mode: 0644
+  - src: dist/completions/chcat.fish
+    dst: /usr/share/fish/vendor_completions.d/chcat.fish
+    file_info:
+      mode: 0644
+  - src: dist/completions/chtail.bash
+    dst: /usr/share/bash-completion/completions/chtail
+    file_info:
+      mode: 0644
+  - src: dist/completions/_chtail
+    dst: /usr/share/zsh/site-functions/_chtail
+    file_info:
+      mode: 0644
+  - src: dist/completions/chtail.fish
+    dst: /usr/share/fish/vendor_completions.d/chtail.fish
+    file_info:
+      mode: 0644
+  - src: dist/completions/chgrep.bash
+    dst: /usr/share/bash-completion/completions/chgrep
+    file_info:
+      mode: 0644
+  - src: dist/completions/_chgrep
+    dst: /usr/share/zsh/site-functions/_chgrep
+    file_info:
+      mode: 0644
+  - src: dist/completions/chgrep.fish
+    dst: /usr/share/fish/vendor_completions.d/chgrep.fish
+    file_info:
+      mode: 0644