[Landing] Update headings and descriptions for clarity in README, installation, and quickstart guides to amplify agentic orchestration (WIP) #6729

Job	Run time
compute-version	3s
build-docs / build-docs	1m 22s
build-artifacts / frontend-build	9s
build-artifacts / gateway-build	11s
build-artifacts / code-lint	46s
build-artifacts / runner-test (macos-latest)	1m 1s
build-artifacts / runner-test (ubuntu-latest)	1m 0s
build-artifacts / generate-json-schema	23s
build-artifacts / python-build	18s
build-artifacts / python-test (macos-latest, 3.12)	2m 59s
build-artifacts / python-test (macos-latest, 3.11)	4m 13s
build-artifacts / python-test (ubuntu-latest, 3.9)	8m 35s
build-artifacts / python-test (macos-latest, 3.13)	3m 12s
build-artifacts / python-test (macos-latest, 3.9)	2m 52s
build-artifacts / python-test (macos-latest, 3.10)	3m 20s
build-artifacts / python-test (ubuntu-latest, 3.11)	9m 43s
build-artifacts / python-test (windows-latest, 3.10)	2m 10s
build-artifacts / python-test (ubuntu-latest, 3.13)	9m 19s
build-artifacts / python-test (windows-latest, 3.9)	3m 29s
build-artifacts / python-test (windows-latest, 3.13)	3m 5s
build-artifacts / python-test (ubuntu-latest, 3.12)	10m 13s
build-artifacts / python-test (windows-latest, 3.11)	2m 3s
build-artifacts / python-test (ubuntu-latest, 3.10)	10m 23s
build-artifacts / python-test (windows-latest, 3.12)	2m 52s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	28s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	27s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	20s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	19s
	1h 25m 15s

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