feat: replace db-iroh-ffi with vendored port of upstream iroh-ffi (iroh-js)

native/iroh-js vendors n0-computer/iroh-ffi v1.1.0's napi-rs crate
(commit 5e45109) at module granularity: endpoint/key/net/path/relay/
ticket/watch; services dropped. All edits carry '// lofi-node:' markers;
UPSTREAM.md records provenance and the tag-bump-by-diff procedure.

lofi_ext.rs is the one extension: Buffer-based u32-BE length-prefixed
framing (writeFrame/readFrame/maxFrame) — upstream Array<number> stream
I/O measured 7.1 MiB/s loopback at gate 0.

TS layer rides the same IrohNode/IrohConn contract: lazy bi-stream per
conn (acceptBi only resolves on first bytes — a silent dialer must not
stall the accept loop), send chained in call order, accept() → null on
endpoint close (acceptor loop exits cleanly; the db_accept gap is gone).
Tickets are upstream EndpointTicket strings now. require() needs .node —
the loader stages an mtime-checked shim next to the cargo artifact.

Gate-0 findings recorded in UPSTREAM.md: watch APIs abort the process
under Deno (tokio-context panic) — never call them; poll instead.

Full regression suite green: codec units, tunnel ws echo, pair, and
convergence fixtures (single node, hosted daemon path, paired over
iroh). db-iroh-ffi is no longer a dependency.

commit

98487260818f473261cef1928dd2132bf4d0583e

parent

9fc652251c80dbb05053dd9a9639d94dc49afed8

author

Dami <dami.etoile@gmail.com>