Add MIT licence and contributor guide

Also ignore the local-only working artifacts (.auto/, .agents/, plan/,
rehearsed-engineer.md) so they stay on disk and out of the repo.

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+# Contributing to ida-tui
+
+Thanks for taking a look. Bug reports, patches and ideas are all welcome.
+
+## What you need
+
+- **Python ≥ 3.11**
+- **IDA Pro 9.4+ with idalib** — ida-tui is a frontend; IDA does the analysis.
+
+There is no way around the IDA requirement for most of the codebase. However,
+a good chunk of the test suite is *pure* (stdlib only, no IDA) and runs
+anywhere — see below. Small fixes to the pure layers are perfectly reviewable
+without a licence.
+
+## Setup
+
+```sh
+uv sync
+```
+
+That pulls [ida-codemode](https://github.com/HexRaysSA/ida-codemode) from PyPI,
+which is how ida-tui talks to IDA. To also attach to databases open in the IDA
+GUI:
+
+```sh
+uvx ida-hcli plugin install ida-codemode
+```
+
+## Running the tests
+
+This repo does **not** use pytest. Every suite is a standalone script with its
+own runner and its own tally line. `tests/run.py --list` prints `pure` or `ida`
+for each file.
+
+```sh
+python3 tests/run.py --fast          # every pure suite — stdlib only, ~1s
+python3 tests/run.py graph -x        # one suite by substring, fail-fast
+python3 tests/run.py                 # everything (needs IDA)
+```
+
+The IDA-backed suites need an interpreter that has `textual`, `idapro` and
+`ida_codemode` on it:
+
+```sh
+<ida-python> tests/test_scenarios.py /path/to/binary --only rename
+<ida-python> tests/test_scenarios.py --list        # scenario names
+```
+
+**House rule:** a suite marked `pure` must keep running under a plain system
+`python3`. This is why `idatui/codemode_client.py` defers its `ida_codemode`
+import instead of doing it at module top. Please don't break that — it's what
+keeps the fast gate fast and lets people without IDA contribute at all.
+
+## Sending a change
+
+- Run at least `python3 tests/run.py --fast` before you push. If your change
+  touches an IDA-backed path, run the relevant scenario suite too and say so
+  in the PR.
+- Keep commits focused, and write a subject line that says what changed and
+  why. Look at `git log` for the house style — it favours a concrete claim
+  ("listing: `c` disassembles until something stops it") over a vague one.
+- If you found a behaviour by measuring it, put the numbers in the commit
+  message. Several of the perf commits here are only reviewable because they
+  did.
+
+## Reporting bugs
+
+Include the binary/architecture if you can share it, the IDA version, and what
+you expected the pane to show versus what it showed. A screenshot of the TUI
+is worth a lot — it's a terminal app, so a copy-pasted pane usually works fine.
+
+## Licence
+
+By contributing you agree that your contributions are licensed under the MIT
+Licence, the same as the rest of the project.