feat: Add agent-tui and tui-explorer skills with comprehensive documentation and scripts

.agents/skills/agent-tui/references/assertions.md

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+# Assertions and Test Oracles
+
+Use this file when translating requirements into checks.
+
+## Turn Requirements into Assertions
+- Convert each requirement into observable UI state (text or stability).
+- Prefer `wait --assert` for pass/fail semantics.
+- Collect evidence with a final `screenshot` before cleanup.
+
+## Assertion Patterns
+- Text presence: `agent-tui wait "Expected" --assert`
+- Text gone: `agent-tui wait "Expected" --gone --assert`
+- Stability: `agent-tui wait --stable --assert`
+
+## Validation Strategy
+- For static UI: text snapshot + `wait` is enough.
+- For dynamic UI: insert `wait --stable` before each action.
+
+## Reporting
+- Report: scenario, actions taken, assertions run, and final evidence (screenshot output).
+- If an assertion fails, include the last screenshot and the expected condition.