build: DTail fork — benchmarks, PGO tooling, Makefile, docker

Squashed development of the build/benchmark/profiling tooling:

- Turbo-vs-normal and per-tool benchmark harnesses under benchmarks/ (with dated
  baseline and result artifacts preserved), plus MapReduce/SSH/network suites.
- Profile-Guided Optimization workflow (internal/tools/pgo lives with the code):
  Makefile targets (make pgo / pgo-quick / build-pgo), profile generation with
  non-zero-sample and representativeness guards.
- Makefile targets for build, test (unit + integration), lint, vet, benchmarking
  and profiling; docker config updates.
- .gitignore hardened against pgo profiles and accidental integration-test
  debug/output dumps.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 44dc08e..4994a06 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,18 +2,55 @@
 *.csv
 *.tmp
 *.out
+.serena
+Test*.log
+*.query
+append:*
 cache/
 log/
 tags
+benchmark_results/
+benchmarks/baselines/current*.txt
+benchmarks/baselines/comparison*.txt
+benchmarks/profiles/
+benchmarks/testdata/
 /cache/
 /log/
+/profiles/
+/profiling/*.prof
+/profiling/profiles/
+/profiling/testdata/
+/testdata/
+test_*.log
 /dtail
 /dgrep
 /dcat
 /dmap
 /dserver
 /dtailhealth
+/dtail-tools
 known_hosts
 id_rsa
 id_rsa.pub
 ssh_host_key
+pgo-profiles/
+pgo-build/
+.amp
+.claude
+
+# Accidental integration-test debug/output dumps (never commit these)
+integrationtests/*_output*.txt
+integrationtests/test_output*.txt
+integrationtests/turbo_test_output*.txt
+integrationtests/manual_*.txt
+integrationtests/debug_*.txt
+integrationtests/strace_output.txt
+integrationtests/test_trace_output.txt
+integrationtests/output_*turbo*.txt
+integrationtests/test_c.txt
+integrationtests/test_colors.txt
+integrationtests/test_plain.txt
+integrationtests/test_config.json
+integrationtests/test_server.json
+integrationtests/test_server_config.json
+/TOOD.md