Tests, licence, and the tooling to keep the repo consistent

A test suite with no dependencies beyond bash and the Python standard
library, run by one command:

  scripts/test.sh                    (or: make test)
  scripts/test.sh --windows [host]   adds the PowerShell suite over SSH

- tests/static.sh: script syntax, JSON validity, VERSION against the widget
  manifest and CHANGELOG, providers.json against the kinds, probes and checks
  the code implements (and ids that would shadow a command), qmllint and
  shellcheck when installed.
- tests/python: unit tests for cm-json.py - providers and the column contract
  bash depends on, the original three scaffolds byte for byte, every
  catalogue parser and the cache, session scan/dismiss/repair, rename,
  defaults, health, the cost guard.
- tests/cli: the CLI in a sandbox with its own HOME, CM_ROOT,
  CLAUDE_CONFIG_DIR and a file-only vault, against fake Ollama, LM Studio,
  keyed-gateway and proxy servers - preflight, presets, models, doctor, a real
  switch, sessions, and the key helper under a rename race.
- tests/windows: the same idea on a Windows host, with USERPROFILE pointed at
  a temp folder so the real install is never touched.

Also: MIT licence, CHANGELOG.md reconstructed from history, .editorconfig and
.gitattributes pinning LF everywhere (what the tree already is), and
scripts/bump-version.sh, since the version lives in two files and drifted
once before.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/cli/test_preflight.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# Preflight: what refuses a switch, and why - against fake servers.
+. "$(dirname "$0")/../lib.sh"
+start_fake
+
+code() { preflight_code "$@" | cut -d' ' -f1; }
+
+expect_eq "$(code ollama)" needs-setup 'a shipped preset is set up before use'
+
+ready_preset ollama "$OLLAMA_URL"
+expect_eq "$(code ollama)" ok 'ollama answers'
+cp "$P/ollama.json" "$P/dead.json"
+python3 "$J" set-url "$P/dead.json" http://127.0.0.1:1 >/dev/null
+expect_eq "$(code ollama dead)" server-unreachable 'a dead ollama is refused'
+
+ready_preset lmstudio "$LMSTUDIO_URL"
+expect_eq "$(code lmstudio)" ok 'lm studio answers'
+
+# custom: every tier empty first, then no address, then the key, then a proxy
+ready_preset custom
+expect_eq "$(preflight_code custom)" 'no-models edit-preset' 'a preset with no models is refused'
+python3 "$J" set-tier "$P/custom.json" opus gw/model-a
+expect_eq "$(preflight_code custom)" 'no-url set-url' 'a custom endpoint needs an address'
+python3 "$J" set-url "$P/custom.json" "$KEYED_URL" >/dev/null
+python3 "$J" set-auth "$P/custom.json" none >/dev/null
+expect_eq "$(code custom)" server-auth 'a keyed endpoint refuses the placeholder'
+cp "$P/custom.json" "$P/proxy.json"
+python3 "$J" set-url "$P/proxy.json" "$PROXY_URL" >/dev/null
+expect_eq "$(code custom proxy)" ok 'a proxy with no model list passes the lenient probe'
+
+run_cm preset new b1 --provider openrouter --blank
+expect_eq "$(code openrouter b1)" no-models 'a blank preset cannot be switched to'
+
+finish