fix(a11y): SiteFooter h4 -> h3 to resolve heading-order skip #28

Job	Run time
Perf budget (initial JS <= 200KB gz)	44s
Go public API docs (godocgen)	20s
RAG + memory demo (Director end-to-end)	38s
CLI smoke (cmd/aicodingagentteam + cmd/godocgen)	56s
Host driver e2e (codex stub binary)	23s
Lighthouse CI (perf/a11y/bp/seo)	2m 25s
axe-core a11y (9 locales)	1m 59s
Governance summary	4s
	7m 29s

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