Correct the test counts in the README

[guohai]

The suite is 49 unit and 11 end-to-end tests; the README still claimed 35 and 8
from before the config, multi-shell and regression tests were added.

Generated with SMT smt@agora.build

[github-actions]

🤖 Codex Code Review

No issues found. The README now accurately reports 49 unit tests and 11 end-to-end tests, matching the test definitions in src/ and tests/tmux_e2e.rs. The change is documentation-only and introduces no security, correctness, performance, or maintainability concerns.

[github-actions]

🤖 Claude Code Review

Verified the claim rather than taking it at face value — counted #[test] attributes across the tree:

File	Tests
src/ansi.rs	6
src/cli.rs	16
src/config.rs	7
src/render.rs	16
src/state.rs	4
unit total	49
tests/tmux_e2e.rs	11

Both new numbers in README.md:192 are exactly right (no #[tokio::test], rstest, or other test-attribute forms in the tree that would shift the count, and no #[ignore]d tests inflating it). I also grepped the rest of the docs for other stale test-count claims — README.md:192 is the only place a count appears, so nothing else needs the same correction.

No concerns in any of the flagged areas: the diff touches one comment line in a fenced code block and no Rust source, no shell hooks, and no capture path. Nothing here affects tmux coordinate arithmetic, $? ordering in precmd, argv handling, or scrollback exposure.

One note on durability rather than correctness: a hardcoded count in prose goes stale on the next test added, and there's no check that fails when it does — this PR is itself the second correction of this line. If it drifts again, dropping the numbers (cargo test # unit + end-to-end tests) removes the maintenance burden entirely. Not a blocker.

Looks good — approve.