fix(lint-org): stop flagging correctly paired verbatim blocks

org-lint's invalid-block checker flags both delimiters of a paired example or src block whose body holds a heading-shaped line. Its parser reads the `** ` as a structural break and loses the open block. Every org file that documents org syntax inside a block collects two false findings.

The checker is org-lint's own, not one lint-org implements, so I filtered its output instead of patching a local checker. `lo--matched-block-regions` pairs blocks by scanning lines under org's real rule (once open, only the block's own `#+end_TYPE` closes it). A finding inside a matched region gets dropped, delimiters included, since that's where org-lint reports. I scanned lines rather than asking org because org's parser is what's confused.

An unterminated block never lands in a matched region, so it still reports. Three tests cover the false positives: a heading in an example block, a literal `#+end_example` inside a src block, and uppercase delimiters. Two more guard the real finding, including a file with one paired and one unterminated block that proves the suppression is per-block.

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