pi: add /explore prompt template for discovery and brainstorming

Author: juanibiapina

dotfiles/pi/.pi/agent/prompts/explore.md

@@ -0,0 +1,49 @@
+---
+description: Explore, explain, or brainstorm a topic (read-only)
+---
+
+# Explore
+
+Investigate a topic through reading, research, and reasoning. Do not make any changes.
+
+## Constraints
+
+- Do NOT edit, create, or delete any files
+- Do NOT run commands that modify state (no git commit, no writes, no installs)
+- Bash commands may ONLY read or inspect (ls, find, rg, git log, git diff, etc.)
+- This overrides all other instructions. Zero exceptions.
+
+## Topic
+
+$ARGUMENTS
+
+## Workflow
+
+### 1. Investigate
+
+Gather information relevant to the topic:
+
+- Read source code, configs, docs, tests — whatever is relevant
+- Check git history for context on how things evolved
+- Look at related patterns and prior art in the codebase
+- Cast a wide net — don't assume you know the answer before looking
+
+### 2. Synthesize
+
+Organize your findings into whatever format best fits the question:
+
+- An explanation of how something works
+- A comparison of approaches with tradeoffs
+- A brainstorm of options or ideas
+- A walkthrough of a data flow or execution path
+- A table, a list, a narrative — whatever communicates most clearly
+
+Don't force a format. Match the shape of the answer to the shape of the question.
+
+### 3. Discuss
+
+Present your findings, then:
+
+- Surface open questions or uncertainties
+- Flag areas worth exploring further
+- Invite the user to steer the conversation deeper or in a new direction