Andrew Miller f22fb29964 python + typescript + bash: mirror the durability fixes from go/ ...

Parity pass on the other three language templates. Same guarantees as
go/: survive server restart, client restart, half-open TCP, and long
outages; rejoin and drain prime-side backlog on reconnect, without
the user writing any of this in process.*.

python/main.py:
- grpc.keepalive_time_ms=10000, keepalive_timeout_ms=3000,
  keepalive_permit_without_calls=1 on the channel. Half-open TCP is
  detected within ~13s instead of the OS default ~2h.
- Exponential backoff with jitter; max_backoff_seconds config ceiling
  (default 120). Attempts counter resets after a session runs
  healthy for 60s so transient restarts don't escalate the delay.
- chain_id added as a required config field and sent as the
  x-chain-id gRPC metadata header (prime rejects streams without it).

typescript/src/main.ts:
- Same keepalive options on the @grpc/grpc-js client.
- Same exponential backoff + jitter logic.
- chain_id added to Config + metadata.

bash/:
- Config + README updated. The bash template uses Python's main.py
  as its runtime, so the behavioural changes above flow through
  without a separate main per language.

Docs: each README gains a "Durability guarantees" section so contract
authors see the invariants without reading the runtime code.

2026-04-19 21:32:24 -04:00

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