fix(conc-sweep): boot the single-server sweep with the reuse rounds' envs

[stojanovic-ana]

• Description: The single-server concurrency sweep boots one shared server on its top rung and measures every lower rung as a reuse round against that server. The boot rung passed MAGPIE_RUN_PHASE=server as an extra env; the reuse rounds do not. Magpie past the current pin (e6833b81) keeps every non-client config env as the running server's identity and refuses a reuse round whose envs differ. So once MAGPIE_REF moves, every MI300X/MI355X single-server sweep fails below the boot rung with "Reuse metadata mismatch". Magpie already sets MAGPIE_RUN_PHASE for each subprocess it spawns, so the boot rung never needed to pass it. This drops it, and the now-unused base_extra_envs parameter of _SweepRun.run_rung.
• Linked issue(s): none. This is a prerequisite for moving MAGPIE_REF past e6833b81, which feat(gpu): support the Radeon AI PRO R9700 (gfx1201) with vLLM #1782 is waiting on.
• Tests: updated test_single_server_boot_only_is_measured_by_reuse_round to assert that the boot round's envs equal the measured reuse round's envs, instead of pinning {"MAGPIE_RUN_PHASE": "server"}. It fails on main (assert {'MAGPIE_RUN_PHASE': 'server'} == {}) and passes with the fix.
  • pytest src/hyperloom/inference_optimizer/tests/test_conc_sweep.py: 119 passed, 2 skipped (plot tests, matplotlib not installed)
  • pytest on the sweep test files (test_conc_sweep*.py, test_cli_conc_sweep_default.py, test_sweep_phase_auto.py, test_geak_sweep_units.py, test_sbd_v6_conc_sweep_*.py): 385 passed, 2 skipped
  • ruff check and ruff format --check (0.16.2) on both changed files: clean
• Size/complexity triggers crossed: none. Three lines removed, one assertion changed.
• If this simplifies or refactors: removes the base_extra_envs parameter of _SweepRun.run_rung; only the boot rung ever passed it. The contract that a single-server sweep boots one server and measures every rung against it is unchanged, and the test above pins it.
• Observable effect: none on the current pin, because Magpie sets MAGPIE_RUN_PHASE for each subprocess itself. After the Magpie bump, MI300X/MI355X single-server sweeps measure every rung instead of failing everything below the boot rung with "Reuse metadata mismatch".
• Breaking changes: no. _SweepRun.run_rung is private to conc_sweep.py.
• PR addresses single concern: yes.
• Root cause is upstream (Magpie/TraceLens/GEAK/IntelliKit/AgentKernelArena), ticket filed: no. Magpie's reuse identity check is intended; the stray env came from Hyperloom.

[chaojhou]

PR #1895 -- fix(conc-sweep): boot the single-server sweep with the reuse rounds' envs

What it does: The single-server concurrency sweep booted its shared server with an extra MAGPIE_RUN_PHASE=server env that the reuse rounds did not carry; Magpie past e6833b81 treats non-client envs as the server's identity, so every reuse rung would fail with "Reuse metadata mismatch". The PR drops that env from the boot call and the now-unused base_extra_envs parameter of _SweepRun.run_rung (src/hyperloom/orchestrator/kernel/conc_sweep.py).

Blocking issues: 1

1. [V5] CI has not run on this head [verified]
   Problem: At head 657c7fe only ReadTheDocs has reported. Tests with Coverage, Lint, Code metrics, CodeQL, PR Hygiene, Packaging, REUSE, Secret Scan, Docs and both E2E workflows are action_required (fork workflow approval pending), while the diff changes src/hyperloom/orchestrator/kernel/conc_sweep.py:580.
   Impact: Nothing has executed the changed sweep path or the edited test; the required checks cannot pass until the runs are approved.
   Action: A maintainer approves the workflow runs for this fork; merge only once the matrix is green.

SKIPPED: V4 -- openprs.txt has # PARTIAL: lines for #1869, #1675, #1276, #1154 and #1032; overlap past their first 100 files was not checked.
SKIPPED: pytest -- not run locally; relies on the CI matrix once approved.

Checked: conc_sweep.py run_rung and the single-server boot/reuse calls; _grid_runner.py _build_variant_yaml base_extra_envs merge; _server_lifecycle.py resolve_lifecycle_params; Magpie benchmarker.py at e6833b81 and main (reuse metadata, client-only env keys); tree-wide grep at head for every writer and reader of MAGPIE_RUN_PHASE and base_extra_envs and every caller of run_rung | Ran: git grep at head; gh api AMD-AGI/Magpie contents; gh api actions/runs for the head | Base: a56028d | Head: 657c7fe

[github-actions]

Gate job conclusion: failure (run) on 657c7fe3c34cca46bad9071326749b9ae64744c4, as reported by GitHub.

The report below was uploaded by that run; the conclusion above is the result.

---

Code metrics gate: FAILED

Judged: the 2 files this change touches. Files it does not touch never fail it; anything found there is listed under Outside this change for information.

Dimension	Limit	New	Worse	Baseline out of date	Baseline entries	vs base
Cyclomatic complexity	fails > 20	0	0	0	73	+0
Cognitive complexity	fails > 30	0	0	0	289	+0
Function length (lines)	fails > 80	0	0	1	453	+0
Nested block depth	fails > 5	0	0	0	27	+0
Module length (lines)	warns > 800, fails > 1200	0	0	1	53	+0
Duplicated lines per file	fails > 0	0	0	0	120	+0
Dead code (vulture)	fails > 0	0	0	0	2	+0

Check	Findings	Effect
Comments	0
English only	0
Production code imports test code	0
Repeated literals	0
A1 Private name of another package	0
A8 Flag argument	0
A9 Tuple return	0
A10 Raw vocabulary comparison	0
A11 Hidden global write	0
A12 Pure forwarder	0
A12 Single-implementation abstraction	0

Baseline out of date (run python scripts/code_metrics.py --update-baseline): 2

Baseline entry	Dimension	Baseline	Now
src/hyperloom/orchestrator/kernel/conc_sweep.py _sweep_one_arm_single_server	Function length (lines)	335	334
src/hyperloom/orchestrator/kernel/conc_sweep.py	Module length (lines)	1429	1426

How to fix

• New or worse: split the unit (extract a function, a class, a module) until it is back under the limit, or no worse than its recorded value. The baseline cannot absorb a new violation: CI refuses any baseline entry added or raised relative to the base branch.
• Baseline out of date: something improved. Run python scripts/code_metrics.py --update-baseline and commit scripts/code_metrics_baseline.txt; the command only lowers or removes entries.
• Override: the baseline-raise PR label waives new, worse and baseline-growth findings and the failing design checks (they stay listed here). Use it only with the reason in the PR description; it waives nothing else.
• Tools for a local run: pip install ruff==0.16.2 complexipy==8.0.1 vulture==2.16 and npm install -g jscpd@5.4.1 (or point CODE_METRICS_JSCPD at another jscpd command, such as npx --yes jscpd@<version>).

89 findings in files this change does not touch

Outside this change (informational): 89

Unit	Dimension	Baseline	Now
src/hyperloom/orchestrator/enablement/recipe/projections.py project_launch_evidence	Cognitive complexity	absent	36
src/hyperloom/orchestrator/state/shared_state.py resolve_graded_comparison	Cognitive complexity	absent	34
src/hyperloom_kb/collect/mapping.py _experience	Cognitive complexity	absent	31
src/hyperloom_kb/schema.py FieldDeclaration.__post_init__	Cognitive complexity	absent	32
src/kernelforge/cli/forge_loop_command.py _prepare_measurement_driver	Cognitive complexity	absent	36
src/kernelforge/cli/forge_loop_command.py _read_kb_warm_start	Cognitive complexity	absent	40
src/kernelforge/loop/runner.py IterationLoop._collect_session_candidate	Cognitive complexity	absent	44
src/kernelforge/loop/runner.py IterationLoop._rule_on_attempt	Cognitive complexity	absent	38
src/hyperloom_kb/tests/test_cli.py	Duplicated lines per file	absent	18
src/hyperloom_kb/tests/test_global_identity_and_pull.py	Duplicated lines per file	absent	13
src/hyperloom_kb/tests/test_local_state.py	Duplicated lines per file	absent	18
src/hyperloom/inference_optimizer/cli/__init__.py _reexport_session_environment	Function length (lines)	absent	112
src/hyperloom/inference_optimizer/cli/__init__.py _resolve_agent_lineup	Function length (lines)	absent	89
src/hyperloom/inference_optimizer/cli/__init__.py _resolve_run_topology	Function length (lines)	absent	92
src/hyperloom/inference_optimizer/cli/__init__.py _resume_session	Function length (lines)	absent	171
src/hyperloom/inference_optimizer/cli/__init__.py _seed_fresh_session	Function length (lines)	absent	183
src/hyperloom/inference_optimizer/multi_node/cli.py _restart_multinode	Function length (lines)	absent	107
src/hyperloom/inference_optimizer/multi_node/scripts/launch_multinode.py _build_parser	Function length (lines)	absent	84
src/hyperloom/inference_optimizer/multi_node/scripts/launch_multinode.py _spawn_rank_actors	Function length (lines)	absent	90
src/hyperloom_kb/http_service.py RequestHandler._dispatch	Function length (lines)	absent	91
src/hyperloom_kb/sync.py GlobalSync.pull	Function length (lines)	absent	86
src/kernelforge/cli/forge_loop_command.py _RunReporter.build_result	Function length (lines)	absent	91
src/kernelforge/cli/forge_loop_command.py _prepare_measurement_driver	Function length (lines)	absent	140
src/kernelforge/cli/forge_loop_command.py _read_kb_warm_start	Function length (lines)	absent	154
src/kernelforge/loop/knowledge_integration.py _measure_warmstart_field	Function length (lines)	absent	83

...and 64 more; the job log lists every row.

Verdict computed by the gate scripts in /home/runner/work/_temp/code-metrics-gate, not by this tree's copy.

_{Thresholds and sources: [tool.hyperloom.code_metrics] in pyproject.toml. Tools: complexipy 8.0.1, jscpd 5.4.1, ruff 0.16.2, vulture 2.16.}

[chaojhou]

Closing as superseded by #1892, which removes the single-server boot-and-reuse path this PR fixes: every rung boots its own server there, so the MAGPIE_RUN_PHASE=server boot env and the reuse-metadata mismatch no longer arise. Thanks for tracking down the Magpie reuse-identity change.