assets: fix edge-label white-line rendering artifact in remaining 7 diagrams

Same fix as orchestration-flow-patterns.svg (8772564), applied after a
comprehensive re-check that found the bug wasn't limited to the 6 files
originally caught by a narrower pattern match - architecture-overview.svg
and firewall-and-network-docker-bypass.svg were also affected.

Confirmed via a control test on orchestration-flow-patterns.svg that the
.drawio source's labelBackgroundColor property was never the actual
cause (reverted it, re-exported, still broken, still fixed cleanly by
the same strip) - this is a draw.io export-time quirk, not a content or
convention problem, so no CLAUDE.md changes needed.

Each file: stripped the same broken wrapper-div background-color
declarations (flat #1C1D1E / #ffffff, or the equivalent light-dark()/
var(--ge-adaptive-bg) variants - not consistent across exports of the
same file), verified 0 remain, valid XML, and the correct adaptive span
background count unchanged before/after in every file.

Files: architecture-overview.svg, firewall-and-network-docker-bypass.svg,
iac-pipeline-tools-flow.svg, observability-pipeline.svg,
readme-trust-boundaries-blast-radius.svg, secret-distribution-flows.svg,
secrets-and-pki-lifecycle.svg

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 5 <[email protected]>

assets/observability-pipeline.svg

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Do not edit this file with editors other than draw.io -->
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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value=&quot;PER-HOST SOURCES&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;320&quot; width=&quot;220&quot; x=&quot;30&quot; y=&quot;40&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;s1&quot; parent=&quot;srcgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;journald&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;persistent, 14-day retention&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;60&quot; width=&quot;180&quot; x=&quot;20&quot; y=&quot;30&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;s2&quot; parent=&quot;srcgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Docker container&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;stdout/stderr, docker_hosts only&amp;lt;/font&amp;gt;&quot; 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+<svg xmlns="http://www.w3.org/2000/svg" style="background: transparent; background-color: transparent; color-scheme: light dark;" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="838px" height="324px" viewBox="0 0 838 324" content="&lt;mxfile host=&quot;embed.diagrams.net&quot; scale=&quot;1&quot; border=&quot;0&quot;&gt;&#10;  &lt;diagram name=&quot;Pipeline&quot; id=&quot;obs-pipeline-1&quot;&gt;&#10;    &lt;mxGraphModel dx=&quot;1178&quot; dy=&quot;659&quot; grid=&quot;1&quot; gridSize=&quot;10&quot; guides=&quot;1&quot; tooltips=&quot;1&quot; connect=&quot;1&quot; arrows=&quot;1&quot; fold=&quot;1&quot; page=&quot;1&quot; pageScale=&quot;1&quot; pageWidth=&quot;1000&quot; pageHeight=&quot;420&quot; math=&quot;0&quot; shadow=&quot;0&quot;&gt;&#10;      &lt;root&gt;&#10;        &lt;mxCell id=&quot;0&quot; /&gt;&#10;        &lt;mxCell id=&quot;1&quot; parent=&quot;0&quot; /&gt;&#10;        &lt;mxCell id=&quot;srcgroup&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;startSize=30;swimlane;fillColor=none;strokeColor=#666666;dashed=1;fontSize=13;fontStyle=1;fontColor=#333333;align=center;&quot; value=&quot;PER-HOST SOURCES&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;320&quot; width=&quot;220&quot; x=&quot;30&quot; y=&quot;40&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;s1&quot; parent=&quot;srcgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;journald&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;persistent, 14-day retention&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;60&quot; width=&quot;180&quot; x=&quot;20&quot; y=&quot;30&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;s2&quot; parent=&quot;srcgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Docker container&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;stdout/stderr, docker_hosts only&amp;lt;/font&amp;gt;&quot; 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vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;60&quot; width=&quot;180&quot; x=&quot;20&quot; y=&quot;255&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;agent&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;fontColor=#333333;fontSize=13;fontStyle=1;shadow=1;&quot; value=&quot;Grafana Alloy&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;native systemd service&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;80&quot; width=&quot;200&quot; x=&quot;360&quot; y=&quot;160&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;loki&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=13;fontStyle=1;shadow=1;&quot; value=&quot;Loki&quot; vertex=&quot;1&quot;&gt;&#10; 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