feat: wasm, http, std, async module changes for workflows

[thesayyn]

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): yes
• Suggested release notes appear below: yes

Changes

• http now supports get, put, patch, and delete methods (previously only get and post existed)
• All http methods accept an optional unix_socket parameter to route requests through a Unix domain
  socket
• http.post(), http.put(), and http.patch() accept a Readable or file as the request body, enabling
  streaming uploads
• fs.open(path) opens a file and returns a Readable stream
• Readable now has a File variant, participating in the same read/iterate interface as stdin and child
  process streams
• Future gains map_ok, map_err, and map_ok_or_else methods for chaining Result-style transforms before
  .block()

---

New APIs

• ctx.http().put(url=, headers=, data=, unix_socket=)
• ctx.http().patch(url=, headers=, data=, unix_socket=)
• ctx.http().delete(url=, headers=, unix_socket=)
• ctx.fs().open(path) → Readable
• future.map_ok(callable) → Future
• future.map_err(callable) → Future
• future.map_ok_or_else(map_ok=, map_err=) → Future

---

Breaking Changes

• http.get() and http.post() parameters are now keyword-only (url=, headers=, data=)
• http.post() data is now optional (previously required as a positional string argument)

Test plan

• Covered by existing test cases

[thesayyn]

@codex review

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