fix: isolate benchmark-compare.sh for parallel invocations

[pdrobnjak]

Summary

• Namespace BASE_DIR per run via RUN_ID (defaults to PID): /tmp/sei-bench-${RUN_ID}/
• Auto-claim port offset slots via atomic mkdir (supports 30 concurrent runs, zero coordination)
• Replace git checkout with git worktrees for isolated builds (no working tree collisions)
• Replace ~/go/bin/seid with GOBIN-based builds per label (no binary collisions)
• Replace ~/.sei staging with mktemp + --home on all seid commands (no init collisions)
• Pass SEI_HOME_DIR/SEID_BIN env vars to populate_genesis_accounts.py (backward-compatible defaults)
• Fix pre-existing double lifecycle bug by passing DURATION=0 to child start-phase

Test plan

• Syntax check: bash -n on both shell scripts, py_compile on Python
• Two concurrent benchmark-compare.sh runs with DURATION=120 — both completed, separate BASE_DIRs, no port conflicts
• All 6 profile types captured for all 4 nodes (CPU ~145KB, fgprof ~115KB, heap ~248KB, etc.)
• TPS data collected (36-37 readings per node)
• pprof -diff_base produces valid analyzable output from both runs
• Port slot locks cleaned up after exit
• Git worktrees cleaned up after exit
• Backward compatible — no env vars needed for single-instance usage

🤖 Generated with Claude Code

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 17, 2026, 12:16 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.35%. Comparing base (6dd8b0b) to head (4d6146e).
⚠️ Report is 1 commits behind head on pd/benchmark-profiling-improvements.

❗ There is a different number of reports uploaded between BASE (6dd8b0b) and HEAD (4d6146e). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (6dd8b0b)	HEAD (4d6146e)
sei-chain	1	0

Additional details and impacted files

@@                           Coverage Diff                            @@
##           pd/benchmark-profiling-improvements    #2898       +/-   ##
========================================================================
- Coverage                                57.19%   48.35%    -8.84%     
========================================================================
  Files                                     2091      671     -1420     
  Lines                                   171173    50615   -120558     
========================================================================
- Hits                                     97897    24474    -73423     
+ Misses                                   64557    24000    -40557     
+ Partials                                  8719     2141     -6578     

Flag	Coverage Δ
sei-chain	?
sei-cosmos	48.16% <ø> (+<0.01%)	⬆️
sei-db	68.72% <ø> (ø)

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see 1543 files with indirect coverage changes

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