[PHP] Add an explicit make-identical files-pull intent

[adamziel]

files-pull now accepts --intent=copy-changes and --intent=make-identical, with copy-changes retaining the existing default in this PR.

make-identical combines the remote-index difference with the inverse of the retained-to-fresh local-index difference. Remote entries win, so local-only selected paths are removed and local edits or deletions are restored. The intent and one files-pull plan cursor provide durable resume state. preserve-local requires copy-changes.

Stacked on #468, after #541.

Testing

• ../vendor/bin/phpunit Import/PushPlanTest.php Import/PullIntentReconciliationTest.php Import/PullStateTest.php Import/FilesPullStateTest.php Import/OnlyFilesPathPrefixTest.php Import/CliHelpTest.php Import/CommandAliasTest.php Import/IndexLifecycleOwnershipTest.php Import/PullFilterOptionTest.php Import/OnlyFilesPathPrefixDiffTest.php Import/CurlTimeoutRecoveryTest.php
• 123 tests, 1,350 assertions

[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	9.00 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	3.42 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	12.42 s

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

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