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.

.gitignore

@@ -0,0 +1,8 @@
+# built binaries (repo root only)
+/chlog
+/chcat
+/chtail
+/chgrep
+# cross-compiled release artifacts (e.g. chlog-linux-amd64)
+/chlog-*
+dist/