[bhavsarpratik]

Summary

Per the marketing guidance, "Splunk, a Cisco company" is retired in favor of the Splunk by Cisco endorsement. The old phrase only appeared inside logo images, so this PR swaps every lockup for the official white "Splunk by Cisco" asset.

• Dashboard and performance card: assets/brand/logo-splunk-acc-rgb-w.png → logo-splunk-by-cisco-rgb-w.png, updated in the server asset allowlist, runtime-manifest.txt, page.html, and performance.html. The recap canvas draw height goes from 59 to 54 to fit the new 2.73:1 aspect ratio.
• Website (docs/index.html, docs/token-optimization.html): new logo, width attributes changed to match the new aspect ratio, alt text set to "Splunk by Cisco".
• Talk slides (docs/talk/): img/splunk-logo.png replaced; alt text updated.
• README: header image re-rendered with the new lockup (same position and width), the alt text and a footer line now say "Splunk by Cisco".
• Logos are the trimmed RGB white PNG from the marketing asset pack. I found no "Splunk + Cisco" or "Splunk and Cisco" wording in the repo.

Test plan

• python3 -m unittest discover -s tests: tests updated for the new path, alt text, dimensions, and canvas size. The marketing and dashboard suites pass (835 tests).
• Embedded dashboard JS parses; Python compiles; git diff --check is clean.
• Checked the rendered README header image by eye.
• Browser check with headless Chrome: the new logo loads with no page errors on the dashboard and performance card (1440 / 1024 px), the website header/footer and article (1440 / 1024 px), and the talk slides (first and last). The old logo path now returns 404.
• ./scripts/install and confirm the /health and /menubar endpoints plus the dashboard logo

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