docs(ecosystem): add Hindsight memory plugin

[DK09876]

Issue for this PR

Closes # N/A — documentation addition, no associated issue.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds one row to the ## Plugins table on the ecosystem page for @vectorize-io/opencode-hindsight, a published npm plugin that gives OpenCode persistent long-term memory across sessions (auto-retain on session idle, recall injected at session start). It sits alongside the existing opencode-supermemory row, which is the same category of plugin.

How did you verify your code works?

It is a single Markdown table row in packages/web/src/content/docs/ecosystem.mdx. I matched the exact column format of the surrounding rows (linked name + one-line description) and confirmed the link resolves to the plugin's source.

Screenshots / recordings

Not a UI change — docs table only.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[mdbenito]

Note that the plugin may fail to load due to a regression in how opencode loads plugins. See e.g. #23726 and #13543 (fixed in 2e27403 but now regressed?)

[DK09876]

Thanks for flagging this, @mdbenito — you were right. The root cause was on our end: the plugin's entry point re-exported a couple of helper functions (loadConfig, deriveBankId) alongside the Plugin, and OpenCode's loader iterates every export and treats each as a plugin factory — so those helpers got invoked as plugins (and on stricter load paths surfaced as the "Plugin export is not a function" error you referenced).

Fixed in @vectorize-io/opencode-hindsight@0.2.6 (just published): the entry now exports only the Plugin (plus type-only exports). I verified it loads cleanly in current OpenCode and the recall/retain/reflect tools register and work. Bumping to 0.2.6 should resolve it. Thanks again for the detailed pointer to the loader regression — saved a lot of digging.