Self-heal missing tree-sitter.wasm by fetching from unpkg / jsdelivr #462

Job	Run time
build-and-smoke-freebuff-windows	3m 4s
build-freebuff	1m 24s
e2e-agent-startup	2m 35s
e2e-slash-commands	50s
e2e-version	58s
e2e-startup	1m 9s
e2e-ads-behavior	1m 2s
e2e-help-command	1m 25s
e2e-code-edit	1m 9s
e2e-terminal-command	53s
	14m 29s

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