feat(opencode): add completion and alias plugin for opencode

Signed-off-by: Pranav Avva <pranav.avva@gmail.com>

plugins/opencode/README.md

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+# opencode plugin
+
+This plugin adds several aliases and shell completion for the [`opencode`](https://opencode.ai) command line tool from Anomaly Innovations.
+
+To use it, add `opencode` to the plugins array of your `.zshrc` file:
+
+```zsh
+plugins=(... opencode)
+```
+
+## Installation
+
+See the [opencode docs](https://opencode.ai/docs#install) for installation instructions.
+
+
+## Aliases
+
+|Alias|Command|Description|
+|-|-|-|
+|`oc`|`opencode`|Run the `opencode` command|
+|`ocr`|`opencode run` |Run `opencode` with a message| 
+
+## Completions
+
+This plugin configures shell completion for the `opencode` command.

plugins/opencode/opencode.plugin.zsh

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+if ! (( $+commands[opencode] )); then
+  print "zsh opencode plugin: opencode not found. Please install opencode before using this plugin." >&2
+  return 1
+fi
+
+# See `opencode completion`
+_opencode_yargs_completions() {
+  local reply
+  local si=$IFS
+  IFS=$'
+' reply=($(COMP_CWORD="$((CURRENT-1))" COMP_LINE="$BUFFER" COMP_POINT="$CURSOR" opencode --get-yargs-completions "${words[@]}"))
+  IFS=$si
+  if [[ ${#reply} -gt 0 ]]; then
+    _describe 'values' reply
+  else
+    _default
+  fi
+}
+
+if [[ "'${zsh_eval_context[-1]}" == "loadautofunc" ]]; then
+  _opencode_yargs_completions "$@"
+else
+  compdef _opencode_yargs_completions opencode
+fi
+
+# Aliases
+alias oc="opencode"
+alias ocr="opencode run"