TAP: a '#' in a test name is read as a directive, so a passing test reports as skipped

[Chemaclass]

Problem

--report-tap writes the test description verbatim, so a # in a name reaches
the consumer as a TAP directive marker. Both tests below pass:

function test_directive_lookalike() {
 bashunit::set_test_title "check # SKIP me"
 assert_same "a" "a"
}
function test_todo_lookalike() {
 bashunit::set_test_title "rename # TODO later"
 assert_same "a" "a"
}

and the report says:

TAP version 13
1..2
ok 1 - check # SKIP me
ok 2 - rename # TODO later

which any TAP parser reads as skipped and todo respectively — I checked
with a parser implementing the usual #\s*(SKIP|TODO) rule. A green test
silently disappears from the count on a CI dashboard.

Realistic names hit this: "logs # TODO remove", "skip # SKIP on CI", or a
title carrying an issue reference like "fix # SKIP flake".

Fix

TAP 13 says a description must not contain an unescaped #; escape it as \#
(and escape a literal backslash first, so \# in a name survives as itself).
The directives bashunit emits are appended after the description, so they are
unaffected.

Applies to every ok/not ok line in src/reports/tap.sh.

[Chemaclass]

Done in #1120 (merged).