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* perf(hooks): batch format+typecheck at Stop instead of per Edit Fixes #735. The per-edit post:edit:format and post:edit:typecheck hooks ran synchronously after every Edit call, adding 15-30s of latency per file — up to 7.5 minutes for a 10-file refactor. New approach: - post-edit-accumulator.js (PostToolUse/Edit): lightweight hook that records each edited JS/TS path to a session-scoped temp file in os.tmpdir(). No formatters, no tsc — exits in microseconds. - stop-format-typecheck.js (Stop): reads the accumulator once per response, groups files by project root and runs the formatter in one batched invocation per root, then groups .ts/.tsx files by tsconfig dir and runs tsc once per tsconfig. Clears the accumulator immediately on read so repeated Stop calls don't double-process. For a 10-file refactor: was 10 × (15s + 30s) = 7.5 min overhead, now 1 × (batch format + batch tsc) = ~5-30s total. * fix(hooks): address race condition, spawn timeout, and Windows path guard Three issues raised in code review: 1. Race condition: switched accumulator from non-atomic JSON read-modify-write to appendFileSync (one path per line). Concurrent Edit hook processes each append independently without clobbering each other. Deduplication moved to the Stop hook at read time. 2. Effective timeout: added run() export to stop-format-typecheck.js so run-with-flags.js uses the direct require() path instead of falling through to spawnSync (which has a hardcoded 30s cap). The 120s timeout in hooks.json now governs the full batch as intended. 3. Windows path guard: added spaces and parentheses to UNSAFE_PATH_CHARS so paths like "C:\Users\John Doe\project\file.ts" are caught before being passed to cmd.exe with shell: true. * fix(hooks): fix session fallback, stale comment, trim verbose comments - Replace 'default' session ID fallback with a cwd-based sha1 hash so concurrent sessions in different projects don't share the same accumulator file when CLAUDE_SESSION_ID is unset - Remove stale "JSON file" reference in accumulator header (format is now newline-delimited plain text) - Remove redundant/verbose inline comments throughout both files * fix(hooks): sanitize session ID, fix Windows tsc, proportional timeouts - Sanitize CLAUDE_SESSION_ID with /[^a-zA-Z0-9_-]/g before embedding in the temp filename so crafted separators or '..' sequences cannot escape os.tmpdir() (cubic P1) - Fix typecheckBatch on Windows: npx.cmd requires shell:true like formatBatch already does; use spawnSync and extract stdout/stderr from the result object (coderabbit P1) - Proportional per-batch timeouts: divide 270s budget across all format and typecheck batches so sequential runs in monorepos stay within the Stop hook wall-clock limit (greptile P2) - Raise Stop hook timeout from 120s to 300s to give large monorepos adequate headroom (cubic P2) * fix(hooks): extend accumulator to Write|MultiEdit, fix tests - Extend matcher from Edit to Edit|Write|MultiEdit so files created with Write and all files in a MultiEdit batch are included in the Stop-time format+typecheck pass (cubic P1) - Handle tool_input.edits[] array in accumulator for MultiEdit support - Rename misleading 'concurrent writes' test to clarify it tests append preservation, not true concurrency (cubic P2) - Add Stop hook dedup test: writes duplicate paths to accumulator and verifies the hook clears it cleanly (cubic P2) - Add Write and MultiEdit accumulation tests * fix(hooks): move timeout to command level, add dedup unit tests - Move timeout: 300 from the matcher object to the hook command object where it is actually enforced; the previous position was a no-op (cubic P2) - Extract parseAccumulator() and export it so tests can assert dedup behavior directly without relying only on side effects (cubic P2) - Add two unit tests for parseAccumulator: deduplication and blank-line handling; rename the integration test to match its scope * fix(hooks): replace removed format/typecheck hooks with accumulator in cursor adapter