fix(search): accept file paths instead of crashing with ENOTDIR (#827)

[Dave-London]

Summary

• Fixes pare-search__search and pare-search__count crashing with spawn ENOTDIR when path points to a file. The schema description already promises file or directory; now both work.
• pare-search__find (fd) genuinely walks directories, so it now surfaces a typed path must be a directory for find error instead of leaking the raw Node ENOTDIR.
• Missing paths now produce a clear path does not exist: <path> error.

Closes #827.

Root cause

packages/server-search/src/tools/search.ts (and count.ts, find.ts) used the user-supplied path as the spawn cwd unconditionally:

const cwd = path || process.cwd();

child_process.spawn throws ENOTDIR synchronously when cwd is set to a non-directory path, so the error leaked out as { "error": "spawn ENOTDIR" }.

Fix

New helper resolveSearchPath(path) in lib/search-runner.ts returns { cwd, target, isFile }:

• undefined → cwd = process.cwd(), target = "."
• directory → cwd = <dir>, target = "." (existing behaviour)
• file → cwd = dirname(file), target = <absolute-file-path>, isFile = true
• missing → throws path does not exist: <path>

search.ts and count.ts route through it and append target instead of a hard-coded ".". count.ts also adds --with-filename when isFile, because rg drops the file: prefix when given a single file and the parser expects file:count.

find.ts resolves the path the same way but throws when the input is a file (fd is not meaningful for a single file root).

Before / after

// Before
search({ path: "/repo/pnpm-lock.yaml", pattern: "^  hono@" })
// → { "error": "spawn ENOTDIR" }

// After
search({ path: "/repo/pnpm-lock.yaml", pattern: "^  hono@" })
// → { matches: [...], totalMatches: 2 }

Test plan

• pnpm --filter @paretools/search build — clean
• pnpm --filter @paretools/search test — 88/88 passing (added 5 unit tests for resolveSearchPath, plus 4 integration tests covering search/count file-path success and find/missing-path typed errors)
• pnpm lint on touched files — clean
• prettier --check on touched files — clean
• CI matrix (ubuntu/windows/macos x node 20/22)

[Dave-London]

Closing as redundant — the two commits in this PR (31af1fb, 508fd43) are already on main. Issue #827 is closed.