webfetch tool fails: `Cannot find module '../data/patch.json' from ''`

Bug

The webfetch tool fails immediately on every URL with:

Cannot find module '../data/patch.json' from ''

Appears to be a missing/inaccessible data file in the bundled webfetch
tool, not transient runtime state. Restart does not fix it.

Environment

• opencode version: 1.18.12 (latest)
• install method: standalone binary at ~/.opencode/bin/opencode (179 MB ELF)
• OS: Fedora Silverblue 44 (linux x86_64)
• Date: 2026-08-03

Reproduction

Any URL passed to webfetch reproduces. Example:

url: https://example.com

Result: error above.

Diagnosis

1. ~/.opencode/bin/opencode is a single self-contained binary
2. No data/ directory exists under ~/.opencode/
3. No patch.json file exists in the install
4. strings on the binary shows no patch.json reference (not embedded)
5. opencode --version reports 1.18.12 = current latest tag
6. opencode upgrade cannot fetch a different build (no newer release)

The from '' (empty string) in the error suggests the bundler lost
the source module's directory at compile time, so the relative path
../data/patch.json resolves from the current working directory
(which is empty / '').

Workaround

Use curl via bash for HTTP fetches until fixed.