Bump wiki to 0a21b49 — multi-lead arc, and opencode's secret supply
Moves the submodule pointer 4320c1c -> 0a21b49, matching the docs to the code in
bc13b8e rather than leaving chapter 11 describing a fleet with one lead in it.
7b5381b 11, 7: CB-530..536 — leaders:, leadScan:, lead-to-lead messaging,
lead deliverability, leads in bridge_list; 7's copy of the portable
block re-synced byte-identically
0a21b49 12: where opencode's secrets actually come from, and why {env:...}
is green under Claude Code and broken in a terminal
Both are already pushed to the wiki's own remote, so this pointer resolves for
anyone who clones — the ordering that matters, and the reason the wiki went
first.
This is the pointer only. `wiki/` is a submodule with its own remote and its
content is never committed here; bumping the recorded SHA in its own commit is
how this repo has always recorded a docs update (see "bump wiki to 4320c1c").
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