fix: pin hero image URL to commit SHA for durability

[transitrix]

Summary

Pins the marketplace listing's hero image URL to a specific commit SHA rather than the mutable main branch. This ensures published versions render the exact image they were built with, even if the repository is restructured or paths are renamed.

Implementation detail

• Updated extension/README.md line 7 to reference commit SHA 77620e5 instead of main
• The main branch README remains editable for presentation fixes between releases
• Each release cycle will pin to its release commit SHA

Verification

The listed version renders its hero image with main moved out from under it:

• URL references a pinned commit (77620e5)
• Image asset exists at that commit
• Frontend README remains mutable on main without contradiction

[github-actions]

📊 Metrics Regression Report

✅ All metrics within tolerance

Summary

• Diagrams tested: 9
• Successful: 9
• Failed: 0
• Violations: 0

Details

ai-expense-approval.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	1	1	0.00	✓
bends	6	6	0.00	✓
edgeLength	1868	1868	0.00 (0.0%)	✓
waypointDensity	2.6	2.6	0.00 (0.0%)	✓
spineDeviation	0	0	0.00	✓
emptyArea	0.48125	0.48125	0.00	✓
portViolations	0	0	0.00	✓

feature-release.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	1	1	0.00	✓
bends	13	13	0.00	✓
edgeLength	3428	3428	0.00 (0.0%)	✓
waypointDensity	3	3	0.00 (0.0%)	✓
spineDeviation	0	0	0.00	✓
emptyArea	0.5500909090909091	0.5500909090909091	0.00	✓
portViolations	0	0	0.00	✓

large-cyclic-workflow.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	2	2	0.00	✓
bends	28	28	0.00	✓
edgeLength	7479	7479	0.00 (0.0%)	✓
waypointDensity	3.12	3.12	0.00 (0.0%)	✓
spineDeviation	66	66	0.00	✓
emptyArea	0.793134974640294	0.793134974640294	0.00	✓
portViolations	1	1	0.00	✓

order-fulfillment.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	0	0	0.00	✓
bends	2	2	0.00	✓
edgeLength	728	728	0.00 (0.0%)	✓
waypointDensity	2.3333333333333335	2.3333333333333335	0.00 (0.0%)	✓
spineDeviation	0	0	0.00	✓
emptyArea	0.5622894736842106	0.5622894736842106	0.00	✓
portViolations	0	0	0.00	✓

parallel-tracks.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	0	0	0.00	✓
bends	6	6	0.00	✓
edgeLength	2104	2104	0.00 (0.0%)	✓
waypointDensity	2.6666666666666665	2.6666666666666665	0.00 (0.0%)	✓
spineDeviation	33	33	0.00	✓
emptyArea	0.6834468042259194	0.6834468042259194	0.00	✓
portViolations	0	0	0.00	✓

simple-approval.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	0	0	0.00	✓
bends	8	8	0.00	✓
edgeLength	1450	1450	0.00 (0.0%)	✓
waypointDensity	3.142857142857143	3.142857142857143	0.00 (0.0%)	✓
spineDeviation	33	33	0.00	✓
emptyArea	0.7764882411250177	0.7764882411250177	0.00	✓
portViolations	0	0	0.00	✓

simple-linear.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	0	0	0.00	✓
bends	0	0	0.00	✓
edgeLength	440	440	0.00 (0.0%)	✓
waypointDensity	2	2	0.00 (0.0%)	✓
spineDeviation	0	0	0.00	✓
emptyArea	0.5258771929824562	0.5258771929824562	0.00	✓
portViolations	0	0	0.00	✓

small-dense-approval.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	0	0	0.00	✓
bends	14	14	0.00	✓
edgeLength	2066	2066	0.00 (0.0%)	✓
waypointDensity	3.272727272727273	3.272727272727273	0.00 (0.0%)	✓
spineDeviation	33	33	0.00	✓
emptyArea	0.8091206777597997	0.8091206777597997	0.00	✓
portViolations	0	0	0.00	✓

xlarge-stress-test.bpmn.transitrix.yaml

Metric	Baseline	Current	Delta	Status
crossings	0	1	+1.00	✓
bends	62	64	+2.00	✓
edgeLength	11526	11674	+148.00 (1.3%)	✓
waypointDensity	3.1481481481481484	3.185185185185185	+0.04 (1.2%)	✓
spineDeviation	132	132	0.00	✓
emptyArea	0.8201716840253008	0.8201716840253008	0.00	✓
portViolations	0	0	0.00	✓