docs: refresh README for ECC 2.1 (#2579)

Refresh the main README for ECC 2.1, including the Plan Canvas demo, install paths, harness guidance, security, sponsors, and community sections.
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haelyra
2026-07-27 15:17:36 -04:00
committed by GitHub
parent 536221cf7a
commit 41441427b9
+561 -1860
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