[Push] Capture the previous local index from compatible file-only pulls

[adamziel]

Compatible file-only pulls now refresh the pair's previous_local_index.jsonl, so files-diff and the next push compare against the last completed pull or push. A selected pull updates only the paths it applied; local additions, edits, and deletions elsewhere remain pending.

The pull retains its applied-path F/D records at the same durable boundary as the importer index. The first capture seeds covered paths from the final importer index and overlays those retained records; later captures merge only the retained records into the existing baseline. This keeps the local type, size, and ctime observed when each path was applied instead of absorbing edits made while an interrupted capture waits to resume.

Capture is a resumable stage after fetch. Aborting an incomplete pull invalidates the old baseline. A pull mode that cannot publish a matching baseline removes it before mutating the tree. files-push snapshots the shared baseline when planning starts so a later pull cannot change an active plan.

Testing

The integration tests run real file-only pulls against a local server and cover initial and partial capture, pending work outside the selected subtree, target deletions, type replacements, interruption and abort recovery, streamed-file timeout boundaries, and paths outside push scope.

[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 8.5.8

Stage	PR	trunk	Δ	Status	Details
playground-sqlite-db-pull	7.22 s	7.10 s	⚪ +120 ms (+1.7%)	✓	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 trunk: 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	2.84 s	2.90 s	⚪ -58 ms (-2.0%)	✓	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 trunk: 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	10.06 s	10.00 s	⚪ +62 ms (+0.6%)

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

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