Usability pass: tool registry, TUI polish, saved keys and settings

Tools
- Table-driven tool registry with permission classes and default/minimal
  profiles; new tools: edit_file, list_dir, glob, grep, delete_file,
  move_file, todo_write, web_fetch, ask_user (plus read_file paging).
- Built-in Myers diff; write tools return unified diffs.
- Persistent permission rules (.agent/permissions.json), per-turn undo
  snapshots (.agent/undo), AGENTS.md project notes, auto-compact at 80%
  of the model context, cancellable run_shell with process-group kill.

TUI
- Table-driven slash commands: /provider /key /effort /status /tools
  /permissions /yolo /undo /retry /diff /export /copy /rename /delete
  /init /max-steps /todo, with / and @ completion.
- Permission modal with diff and prefix rules, ask_user modal, todo
  panel, header with model/effort/context, bracketed paste, line editing,
  wide-char cursor, NO_COLOR and ASCII fallback; Esc never quits.

Startup and configuration
- API keys are entered in the TUI (hidden) and saved per provider in
  <config>/credentials (0600); env variables are only a fallback.
- Last provider, per-provider model and reasoning effort are remembered
  in <config>/settings.json; --effort/-e and /effort send
  reasoning_effort (low|medium|high|max) to models that accept it.
- DeepSeek preset uses deepseek-flash / deepseek-v4-pro.
- Session flags --new/--continue/--resume/--list-sessions, --yolo,
  --confirm.

Compatibility and tests
- ncurses detection, macOS/Homebrew support, make install, XDG config
  dir, POSIX cleanups; Gitea CI (gcc/clang/asan/musl/macOS).
- Unit tests for diff, fs tools, registry, undo/perms and config;
  e2e fixtures multi_file_refactor and ask_or_todo; vendored cJSON.

scripts/e2e_mini_calc.sh

@@ -1,114 +1,15 @@
 #!/usr/bin/env bash
-# E2E: copy mini_calc → temp workspace → optional cst-agent headless → make test.
-# Usage:
-#   ./scripts/e2e_mini_calc.sh           # run agent if credentials exist
-#   ./scripts/e2e_mini_calc.sh --baseline-only   # only prove fixture starts RED then skip agent
-#   SKIP_AGENT=1 ./scripts/e2e_mini_calc.sh
+# E2E on fixtures/mini_calc (kept for compatibility; see e2e_fixture.sh).
+#   ./scripts/e2e_mini_calc.sh [--protocol P] [--provider NAME] [--model M]
+#   ./scripts/e2e_mini_calc.sh --baseline-only   # only prove the fixture is RED
+#   SKIP_AGENT=1 ./scripts/e2e_mini_calc.sh       # same as --baseline-only
+# API key: CST_API_KEY / DEEPSEEK_API_KEY / OPENAI_API_KEY / MINIMAX_API_KEY
+# or ~/.config/cst-agent/credentials.
 set -euo pipefail
-
 ROOT="$(cd "$(dirname "$0")/.." && pwd)"
-FIX="$ROOT/fixtures/mini_calc"
-OUT="$FIX/out"
-BASELINE_ONLY=0
-for a in "$@"; do
-  case "$a" in
-    --baseline-only) BASELINE_ONLY=1 ;;
-  esac
-done
-
-mkdir -p "$OUT"
-STAMP="$(date -u +%Y%m%dT%H%M%SZ)"
-WORKDIR="$(mktemp -d /tmp/cst-mini-calc.XXXXXX)"
-RESULT="$OUT/result-$STAMP.txt"
-SESSION_COPY="$OUT/session-$STAMP.jsonl"
-
-cleanup() { rm -rf "$WORKDIR"; }
-trap cleanup EXIT
-
-echo "== mini_calc e2e ==" | tee "$RESULT"
-echo "workdir=$WORKDIR" | tee -a "$RESULT"
-echo "stamp=$STAMP" | tee -a "$RESULT"
-
-# Fresh copy (no .agent from previous runs)
-cp -a "$FIX/." "$WORKDIR/"
-rm -rf "$WORKDIR/out" "$WORKDIR/.agent"
-chmod +x "$WORKDIR/tests/smoke.sh"
-
-cd "$WORKDIR"
-make clean >/dev/null 2>&1 || true
-make
-
-echo "-- baseline make test (expect FAIL before agent) --" | tee -a "$RESULT"
-set +e
-make test >"$OUT/baseline-$STAMP.log" 2>&1
-base_rc=$?
-set -e
-echo "baseline_rc=$base_rc" | tee -a "$RESULT"
-if [[ "$base_rc" -eq 0 ]]; then
-  echo "UNEXPECTED: fixture already passes; bugs may have been fixed in source." | tee -a "$RESULT"
-  echo "outcome=unexpected_green_fixture" | tee -a "$RESULT"
-  exit 2
+extra=()
+if [[ "${SKIP_AGENT:-0}" == "1" ]]; then
+  extra+=(--baseline-only)
 fi
-echo "baseline: RED (as expected)" | tee -a "$RESULT"
-
-if [[ "$BASELINE_ONLY" -eq 1 || "${SKIP_AGENT:-0}" == "1" ]]; then
-  echo "outcome=baseline_ok_agent_skipped" | tee -a "$RESULT"
-  echo "SKIP agent step (--baseline-only or SKIP_AGENT=1)"
-  exit 0
-fi
-
-# Need API key for agent step
-has_key=0
-if [[ -n "${CST_API_KEY:-}" || -n "${MINIMAX_API_KEY:-}" ]]; then
-  has_key=1
-elif [[ -f "$HOME/.config/cst-agent/credentials" ]]; then
-  has_key=1
-fi
-if [[ "$has_key" -eq 0 ]]; then
-  echo "outcome=baseline_ok_no_api_key" | tee -a "$RESULT"
-  echo "No API key; agent step skipped. Set CST_API_KEY or save credentials."
-  exit 0
-fi
-
-cd "$ROOT"
-make -s
-
-mkdir -p "$WORKDIR/.agent"
-PROMPT="$(cat "$FIX/TASK.md")"
-export CST_AUTO_APPROVE=1
-echo "-- cst-agent headless --" | tee -a "$RESULT"
-set +e
-"$ROOT/cst-agent" --headless --workspace "$WORKDIR" --session "$WORKDIR/.agent/e2e.jsonl" \
-  --prompt "$PROMPT" >"$OUT/agent-$STAMP.log" 2>&1
-agent_rc=$?
-set -e
-echo "agent_rc=$agent_rc" | tee -a "$RESULT"
-if [[ -f "$WORKDIR/.agent/e2e.jsonl" ]]; then
-  cp -f "$WORKDIR/.agent/e2e.jsonl" "$SESSION_COPY"
-  echo "session_copy=$SESSION_COPY" | tee -a "$RESULT"
-fi
-
-cd "$WORKDIR"
-set +e
-make test >"$OUT/after-$STAMP.log" 2>&1
-test_rc=$?
-set -e
-echo "after_test_rc=$test_rc" | tee -a "$RESULT"
-
-# Classify
-changed=0
-if ! diff -q "$FIX/calc.c" "$WORKDIR/calc.c" >/dev/null 2>&1; then
-  changed=1
-fi
-echo "calc_c_changed=$changed" | tee -a "$RESULT"
-
-if [[ "$test_rc" -eq 0 ]]; then
-  echo "outcome=pass" | tee -a "$RESULT"
-  exit 0
-fi
-if [[ "$changed" -eq 1 ]]; then
-  echo "outcome=partial" | tee -a "$RESULT"
-  exit 1
-fi
-echo "outcome=fail" | tee -a "$RESULT"
-exit 1
+exec "$ROOT/scripts/e2e_fixture.sh" mini_calc --out "$ROOT/fixtures/mini_calc/out" \
+  "${extra[@]}" "$@"