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

.agents/skills/tui-explorer/references/discovery.md

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+# Discovery
+
+Run:
+- `skills/tui-explorer/scripts/tui_explorer discover --command "<app command>"`
+- Before running discover, start live preview so users can observe exploration in the web UI:
+  - `agent-tui live start --open`
+- After verification, stop preview:
+  - `agent-tui live stop`
+
+## Strategy
+- Bounded BFS over action paths.
+- Rebuild each node from a fresh session for deterministic state evaluation.
+- Deduplicate with:
+  - `sha256(normalized_screenshot + cursor + cols + rows)`
+
+## Normalization
+- Strip ANSI sequences.
+- Collapse whitespace.
+
+## Stop rules
+- `max_depth`
+- `max_states`
+- `branch_limit`
+- `time_budget_sec`
+
+## Artifacts
+- `acceptance.md` (includes OpenSpec-style `WHEN/THEN/SHOULD` expectation narrative plus executable step lines)
+- `trace.jsonl`
+- `discover-report.json`
+
+## Session isolation
+- Session changes made in the web UI are preview-local.
+- Discovery/verify commands must not rely on browser-driven active session switching.