tools: remove reasoning_think script (now a builtin)

tools/reasoning_think

@@ -1,27 +0,0 @@
-#!/usr/bin/env bash
-# ollie:parallel read
-# args_json: {"type":"object","required":["thought"],"properties":{"thought":{"type":"string","description":"Your reasoning"}}}
-# ollie:prompt
-# ## reasoning_think
-#
-# Scratchpad for externalizing reasoning. Recorded in history but not shown to the user.
-#
-# **Trigger condition**: before acting on non-trivial tasks — complex problems, multi-step logic, decisions with trade-offs. Skip for simple single-step tasks.
-#
-# **Calling convention**:
-# ```
-# reasoning_think(thought="your reasoning here")
-# ```
-#
-# **Returns**: nothing. The value is in writing the thought.
-#
-# **Constraints**:
-# - One call per decision point.
-# - Never call reasoning_think more than once before taking an action.
-# - Keep under 200 words.
-# ollie:end
-
-source "${OLLIE_TOOLS_PATH:-$(dirname "$0")}/_lib/args.sh"
-# Just consume the input; the value is in writing it to history
-arg_require "thought" > /dev/null
-exit 0