refactor(panels, examples): cap the remaining runs

The panel migration tests (improvise-35e) keep their claim and lose their
history; tile_bar's scroll loop keeps its algorithm note. gen-grammar's
usage block is trimmed to the one line a reader runs.

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

examples/gen-grammar.rs

@@ -1,21 +1,8 @@
-//! Generate a random valid example matching a rule from `improv.pest`.
-//!
-//! Usage:
-//!   cargo run --example gen-grammar -- <rule_name>
-//!
-//! Examples:
-//!   cargo run --example gen-grammar -- file
-//!   cargo run --example gen-grammar -- category_section
-//!   cargo run --example gen-grammar -- bare_name
-//!
-//! Each invocation generates one example seeded from the current time + PID.
-//!
-//! The generator adds constraints beyond what the grammar requires to produce
-//! realistic, round-trippable output:
-//! - bare names are drawn from a word pool instead of random letters
-//! - pipe_inner is never empty
-//! - rest_of_line always produces at least one character
-//! - repetitions (`*`) produce 1–4 items, not 0
+//! `cargo run --example gen-grammar -- <rule_name>` — one random valid example
+//! of a rule from `improv.pest`, seeded from the current time + PID.
+
+// The generator constrains the grammar to produce realistic, round-trippable
+// output rather than degenerate minima — `context/test-evidence/tui.md`.
 
 use pest_meta::ast::{Expr, RuleType};
 use pest_meta::parser;

examples/pretty-print.rs

@@ -1,8 +1,5 @@
-//! Parse a `.improv` file from stdin and print the formatted result to stdout.
-//!
-//! Usage:
-//!   cargo run --example pretty-print < file.improv
-//!   cargo run --example gen-grammar -- file | cargo run --example pretty-print
+//! Parse a `.improv` file from stdin and print the formatted result to stdout:
+//! `cargo run --example pretty-print < file.improv`.
 
 use std::io::Read;