fix: accept Windows script paths and start the daemon from a real install (#23)

Two independent Windows/production defects reported in #22.

browser_run_script rejected every absolute path on Windows. The allowed-root
check compared with a hardcoded `${root}/`, but path.resolve returns
backslash-separated paths there, so a file inside os.tmpdir() was refused even
though the rejection message listed tmpdir as allowed. Decide containment with
path.relative instead: it is separator-agnostic and carries each platform's own
case rules, so it also accepts a differing drive-letter case that a path.sep
patch would still reject. Escapes via `..` and sibling directories sharing the
root's name prefix stay rejected, as before.

The daemon could not start under `npm omit=dev`: it is spawned through tsx,
which was declared only as a dev dependency. Moving tsx to dependencies is not
enough on its own — pi installs extensions into one flat hoisted tree, so tsx
lands beside the package and the fixed <pkg>/node_modules/.bin/tsx lookup still
misses, falling through to an `npx tsx` that resolves against the wrong cwd and
dies against stdio: "ignore". Resolve the CLI entry with Node's own resolver,
which walks up to the hoisted copy. That removes the shell entirely, and with it
the Windows .cmd shim, windowsVerbatimArguments, and the manual quoting that
paths containing spaces needed.

Both fixes live in platform-branching code, so their tests are registered in the
three-OS CI matrix that already exists for that purpose — a Linux-only run
cannot exercise either one.

1 files changed, 2 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 988e5bb..5810ea3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ All notable changes to pi-browser-harness will be documented in this file.
 ### Fixed
 
 - **Chrome remote-debugging consent is no longer retriggered indefinitely in the background.** A cancelled, failed, or disconnected CDP connection now remains disconnected until the next explicit browser request, which makes one on-demand connection attempt instead of running an unbounded retry loop that can repeatedly interrupt normal browsing.
+- **`browser_run_script` accepts paths on Windows again.** The allowed-directory check compared against a hardcoded `/` separator, so every backslash path — including files inside `os.tmpdir()`, which the rejection message itself listed as allowed — was refused. Containment is now decided by `path.relative`, which carries each platform's own separator and case rules.
+- **The daemon starts from a production install.** `tsx` is needed to run the daemon but was declared only as a dev dependency, so `browser_setup` reported `Could not start the browser daemon` under `npm omit=dev`. It is now a runtime dependency, and the daemon is launched via the CLI entry that Node's resolver finds — a fixed `node_modules/.bin` path does not exist in a hoisted install, which is how pi lays extensions out.
 
 ## 0.11.0 — 2026-08-02