docs: AGENTS.md ecosystem table still references sprout-named internal repos #2557

AGENTS.md's Ecosystem table and pipeline diagram still point at pre-rename internal repos:

• squareup/sprout-releases
• squareup/sprout-oss
• squareup/sprout-backend-blox

(Lines 16-26 of AGENTS.md; squareup/block-coder-tf-stacks looks fine.)

These are private, so outside contributors can't tell whether they were renamed alongside block/sprout → block/buzz or still live under the sprout names. If they were renamed, the table/diagram should be updated to match (happy to send the PR if someone can confirm the current names); if they weren't, a short note saying the internal repos intentionally retain the legacy name would stop this from reading as a stale link.

Related cleanups from the same sweep: #2519, #2555, #2556.

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