feat(agents): add narrowly-scoped agent sort shim and install at plugin entry

OpenCode 1.4.x ignores the agent `order` field (sst/opencode#19127), so its
`Agent.list()` sorts purely by `agent.name` via Remeda `sortBy` which uses
native string `<`/`>` comparison. Without intervention, the four core agents
fall into alphabetical order (Atlas -> Hephaestus -> Prometheus -> Sisyphus),
which is not the canonical sisyphus -> hephaestus -> prometheus -> atlas order
the project ships.

Prior attempts to bias the sort key with invisible characters (ZWSP,
U+2060 WORD JOINER, U+00AD SOFT HYPHEN, ANSI escape) all caused
`Bun.stringWidth()` vs terminal-width drift, producing visible gaps and
column truncation in the TUI status bar (#3259, #3238).

Solution: a narrowly-scoped shim of `Array.prototype.toSorted` and
`Array.prototype.sort` that activates only when the array contains two or
more agent objects whose `.name` matches a canonical core display name.
The activation predicate guards against mixed-type arrays so unrelated
`.sort()` / `.toSorted()` calls (string arrays, number arrays, mixed
objects) execute native behavior unchanged. Install is idempotent.

Cubic P1 mitigations from PR #3267:
- `isAgentArray` rejects any array with non-object or null elements,
  eliminating the throw-on-mixed-array failure mode.
- Strict activation predicate (>= 2 ranked elements) keeps the global
  prototype patch from affecting unrelated sort calls.

Remove this shim once OpenCode honors the agent `order` field
(sst/opencode#19127).

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/index.ts

@@ -14,11 +14,13 @@ import { loadPluginConfig } from "./plugin-config"
 import { createModelCacheState } from "./plugin-state"
 import { createFirstMessageVariantGate } from "./shared/first-message-variant"
 import { injectServerAuthIntoClient, log, logLegacyPluginStartupWarning } from "./shared"
+import { installAgentSortShim } from "./shared/agent-sort-shim"
 import { detectExternalSkillPlugin, getSkillPluginConflictWarning } from "./shared/external-plugin-detector"
 import { startBackgroundCheck as startTmuxCheck } from "./tools/interactive-bash"
 import { createPluginPostHog, getPostHogDistinctId } from "./shared/posthog"
 
 const serverPlugin: Plugin = async (input, _options): Promise<Hooks> => {
+  installAgentSortShim()
   initConfigContext("opencode", null)
   log("[oh-my-openagent] ENTRY - plugin loading", {
     directory: input.directory,