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.

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

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+# Replay
+
+Run:
+- `skills/tui-explorer/scripts/tui_explorer verify --spec "<acceptance.md>"`
+
+## Execution model
+- Spawn a fresh session per scenario.
+- Execute each step in order.
+- Use `wait --assert` for `expect` steps.
+- Stop on first scenario failure (fail-fast).
+
+## Result contract
+- Exit `0`: all scenarios pass.
+- Exit `1`: scenario/assertion failure.
+- Exit `2`: spec validation error.
+- Exit `69`: agent-tui/daemon unavailable.
+
+## Failure artifacts
+- `verify-report.json`
+- `failures/<scenario>-step-<n>.txt`

.agents/skills/tui-explorer/references/schema-v1.md

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+# Schema v1
+
+Acceptance files are markdown with YAML frontmatter.
+
+## Required frontmatter
+- `schema_version: "v1"`
+- `command`
+- `cols`
+- `rows`
+- `default_timeout_ms`
+- `generated_at`
+- `generator`
+
+Optional:
+- `cwd`
+
+## Scenario format
+Scenario header:
+- `## Scenario: <name>`
+
+Optional OpenSpec-style expectation narrative (human-readable):
+- `### Expectation` (or `### Expectations`)
+- `- **WHEN** ...`
+- `- **THEN** ...`
+- `- **AND** ...` (optional)
+- `- **SHOULD** ...`
+
+Supported steps:
+- `- expect: "<text>"`
+- `- press: "<key>"`
+- `- type: "<text>"`
+- `- wait_stable: true`
+
+OpenSpec narrative lines are ignored by the verifier parser; executable behavior is driven by the supported step lines.
+Any other non-empty line format is invalid.