refactor(commands): split api into parse/dispatch/handler boundaries

lua/opencode/commands/AGENTS.md

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+# AGENTS.md (commands)
+
+This directory defines the command execution pipeline.
+
+## Scope
+
+- Parse command input into structured intent (`parse.lua`)
+- Bind intent to executable action (`init.lua`)
+- Execute lifecycle (`dispatch.lua`)
+- Wire slash/keymap/API into the same axis
+
+## Hard Invariants
+
+- Single execution entry: `dispatch.execute(ctx)`
+- Single bind point: `commands.bind_action_context(...)`
+- `parse.lua` does not bind execute functions
+- No `dispatch.run`, no `route.execute`, no fake parse wrapper
+
+## Hook Model
+
+- Stage hooks: `before`, `after`, `error`, `finally`
+- Global hook: no command filter (`command = '*'` or omitted)
+- Command-scoped hook: `command = 'run'` or `{'run','review'}`
+- Keep hook handlers side-effect aware and idempotent
+
+## Expected Execution Shape
+
+```text
+entry (:Opencode | keymap | API | slash)
+  -> parse/build intent
+  -> bind_action_context (single bind point)
+  -> dispatch.execute (single execute point)
+  -> hooks(before/after/error/finally)
+```
+
+## Editing Rules
+
+- Prefer deleting duplicated glue code over adding adapters
+- Keep error normalization in `dispatch.lua`
+- Keep notify behavior unchanged unless explicitly requested
+- Do not split semantics by entry (`:Opencode` / keymap / API / slash)
+
+## Allow / Disallow Examples
+
+- Allowed:
+  - entry adapters call `commands.build_parsed_intent(...)` + `commands.execute_parsed_intent(...)`
+  - infra changes that keep `dispatch.execute(ctx)` as the single execute entry
+- Disallowed:
+  - fallback branches such as `if commands.execute_parsed_intent then ... else ...`
+  - building action context outside `commands.bind_action_context(...)`
+  - adding per-entry behavior forks (`if source == 'keymap' then ...`)
+
+## Quick Review Checklist
+
+- Does new code bypass `dispatch.execute`?
+- Does new code create a second bind path?
+- Does parse start carrying execute logic again?
+- Are hook semantics consistent for all entries?
+
+## Reject Conditions
+
+- Any new execute entry besides `dispatch.execute`
+- Any new bind path besides `bind_action_context`
+- Parse starts binding execute functions again
+
+## Minimal Regression Commands
+
+- `./run_tests.sh -t tests/unit/commands_dispatch_spec.lua`
+- `./run_tests.sh -t tests/unit/commands_parse_spec.lua`
+- `./run_tests.sh -t tests/unit/commands/command_axis_spec.lua`
+- `./run_tests.sh -t tests/unit/keymap_spec.lua`
+- `./run_tests.sh -t tests/unit/api_spec.lua -f "command routing"`
+
+## Entry Notes For New Agents
+
+- Read `parse.lua`, `init.lua`, `dispatch.lua` in this order before editing.
+- Treat this directory as **execution infrastructure**, not feature surface.
+- If a change needs new behavior, prefer changing handlers first; only touch command infrastructure when all entries must change together.
+- Keep edits local and reversible: no new execution entry, no new bind path, no per-entry semantic split.

lua/opencode/commands/complete.lua

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+local M = {}
+
+---@param items string[]
+---@param prefix string
+---@return string[]
+local function filter_by_prefix(items, prefix)
+  return vim.tbl_filter(function(item)
+    return vim.startswith(item, prefix)
+  end, items)
+end
+
+---@return string[]
+local function user_command_completions()
+  local config_file = require('opencode.config_file')
+  local user_commands = config_file.get_user_commands():wait()
+  if not user_commands then
+    return {}
+  end
+
+  local names = vim.tbl_keys(user_commands)
+  table.sort(names)
+  return names
+end
+
+---@type table<string, fun(): string[]>
+local provider_completions = {
+  user_commands = user_command_completions,
+}
+
+---@param subcmd_def OpencodeUICommand
+---@param num_parts integer
+---@return string[]
+local function resolve_subcommand_completions(subcmd_def, num_parts)
+  if num_parts <= 3 then
+    if type(subcmd_def.completions) == 'table' then
+      return subcmd_def.completions --[[@as string[] ]]
+    end
+
+    if type(subcmd_def.completion_provider_id) == 'string' then
+      local provider = provider_completions[subcmd_def.completion_provider_id]
+      return provider and provider() or {}
+    end
+  end
+
+  if num_parts <= 4 and type(subcmd_def.sub_completions) == 'table' then
+    return subcmd_def.sub_completions --[[@as string[] ]]
+  end
+
+  return {}
+end
+
+---@param command_definitions table<string, OpencodeUICommand>
+---@param arg_lead string
+---@param cmd_line string
+---@return string[]
+function M.complete_command(command_definitions, arg_lead, cmd_line)
+  local parts = vim.split(cmd_line, '%s+', { trimempty = false })
+  local num_parts = #parts
+
+  if num_parts <= 2 then
+    local subcommands = vim.tbl_keys(command_definitions)
+    table.sort(subcommands)
+    return vim.tbl_filter(function(cmd)
+      return vim.startswith(cmd, arg_lead)
+    end, subcommands)
+  end
+
+  local subcommand = parts[2]
+  local subcmd_def = command_definitions[subcommand]
+
+  if not subcmd_def then
+    return {}
+  end
+
+  return filter_by_prefix(resolve_subcommand_completions(subcmd_def, num_parts), arg_lead)
+end
+
+return M