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Sanitize RFC 5545 control characters in TEXT on output (#1712) (#1741)

* Sanitize CONTROL characters in TEXT on output (#1712)

Parse stays open; leftover CONTROLs are stripped on serialize so NUL cannot reach ICS output.

AI use: Cursor Grok 4.6
Prompt: Fix NUL in TEXT values by sanitizing on output per #1712.

* Ignore dateutil VTIMEZONE parse errors in the fuzzer (#1712)

CIFuzz reached dateutil after parse stayed open; ignore those expected ValueErrors.

AI use: Cursor Grok 4.6
Prompt: Add dateutil parse errors to the fuzzer ignore list after CI failed.

* Strip raw newlines when assembling content lines (#1712)

A malformed RRULE key reached to_ical() with a raw LF after parse stayed open. from_parts now strips leftover CR/LF so serialize cannot hit the Contentline assert.

AI use: Cursor Grok 4.6
Prompt: Stop CIFuzz AssertionError on unescaped newlines in content lines for #1741.

* Ignore Contentline raw-newline assert in the fuzzer (#1712)

from_parts must keep failing loudly (issue #1445). CIFuzz hit that assert on a malformed RRULE; treat only that message as an expected parse/serialize error.

AI use: Cursor Grok 4.6
Prompt: Revert silent newline stripping and ignore only the Contentline raw-newline assert in the fuzzer.

* Sanitize TEXT CONTROLs in vText construction (#1712)

Keep the public UNSAFE_TEXT_CHARS name. Filter in vText.__new__ so to_ical and to_jcal stay clean; leave _escape_char as an escaper. Drop unproven fuzzer ignores.

AI use: Cursor Grok 4.6
Prompt: Address angatha review on #1741: restore UNSAFE_TEXT_CHARS and move filtering out of _escape_char.

* Fix ruff D301 on TEXT control-char docstring (#1712)

Use a raw docstring for _strip_unsafe_text_chars. Tighten the two remaining fuzzer ignore comments to the proven CIFuzz exceptions.

AI use: Cursor Grok 4.6
Prompt: Fix ruff D301 and confirm remaining #1741 review items.

* Coerce non-string TEXT values before stripping CONTROLs (#1712)

to_unicode leaves UUID/int/None un... (continued)

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