feat(knowledge): bind replay artifacts to champion recipes

[meinali-566]

Summary

• bind champion throughput to canonical argv, environment, workload metadata, and integrity-checked source patches in a replay bundle
• keep local patches inline while externalizing large remote artifacts to content-addressed GBrain pages, with fail-closed hydration and base-SHA validation
• normalize replayed server arguments for Magpie's unquoted environment expansion and preserve legacy recipe compatibility

Test plan

• Run targeted Recipe KB, replay bundle, warm replay, GBrain store, and workload materialization tests (160 passed)
• Verify local and remote champion merge behavior, artifact publication/hydration, and incomplete-bundle rejection
• Verify single-quoted JSON server arguments materialize into Magpie-safe argv

Made with Cursor

[github-actions]

CI E2E report — ✅ Succeeded

item	value
result	✅ Succeeded
model	Qwen/Qwen3-0.6B (dense)
resources	1× GPU, TP=1
PR branch	fix/gbrain-replay-bundle-magpie-argv
commit	df8419769233196230aa109920c63e7b0ccacdf7
session_id	b4367fe0-19df-4f13-8e93-32a0b5d9115d
queue → dispatch	0s
run time	172m 31s
total	172m 31s

details