Expand pull filters into path selections

[adamziel]

--filter=essential-files now expands to --exclude=:wp-uploads:, while --filter=skipped-earlier expands to --only=:wp-uploads:.

This removes the secondary skipped-file list and checkpoint. skipped-earlier no longer requires a prior run, and completed pulls can switch filters as a new path-selected delta. The compatibility option remains accepted but is omitted from command help. On load, old skipped-list fields are discarded while the existing path-selection fingerprint remains unchanged.

Stacked on #437.

Testing

(cd tests && ../vendor/bin/phpunit Import)
php vendor/bin/phpstan analyze --memory-limit=1G
vendor/bin/phpcs --standard=PHPCompatibility --runtime-set testVersion 7.4- -ps packages/reprint-importer/src
git diff --check

[github-actions]

Pull pipeline performance — large-directory

Site: large-directory · 2,000+ plus targeted file-transfer scenarios files · 10,000 posts · 25,000 postmeta · PHP 8.5.9

trunk baseline unavailable — showing PR numbers only.

Stage	Wall time	Resume attempts	Status	Details
playground-sqlite-db-pull	9.72 s	1	✓	condition=db-pull in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=lexer native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=selected
playground-sqlite-db-apply	3.58 s	1	✓	condition=db-apply to SQLite in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=parser native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=verified native_ast=WP_MySQL_Native_Parser_Node sqlite_driver_parser=verified
Total	13.30 s

_{Numbers carry runner noise; treat single-run deltas as directional, not authoritative.}

_{📈 Trunk performance history — commit-by-commit timeline.}