feat(node): self-contained binary — embed Rholang resources, defaults.conf, eliminate kamon

[spreston8]

Summary

Make the Rust node binary fully self-contained at runtime: bake the genesis-ceremony Rholang sources and the HOCON defaults into the executable at compile time. After this lands, target/release/node run --data-dir <dir> works from any CWD with no `DEFAULT_DIR` env var, no workspace tree on disk, and no resource-file mounts in the runtime container.

This unblocks lighter-weight integration test infrastructure (subprocess-based provider, planned next) and removes a class of "works on my machine" CWD-dependency bugs.

What's in scope

Commit 1 (`d1290862`) — feat(node): self-contained binary

Area	Change
Rholang resources	All 11 `.rho` / `.rhox` genesis sources (Registry, ListOps, Either, NonNegativeNumber, MakeMint, AuthKey, SystemVault, MultiSigSystemVault, Stack, TokenMetadata, PoS) embedded via `include_str!` in a new `casper/src/rust/genesis/contracts/embedded_rho.rs`. `standard_deploys.rs` rewritten through a small `embedded_source` helper.
File-loading machinery removed	`CompiledRholangSource::apply` / `apply_with_env` / `load_source` and `CompiledRholangTemplate::load_template` (the 8-path filesystem fallback ladder) deleted from production code. `CompiledRholangTemplate::new` now takes the template body as `&str`.
HOCON defaults	`defaults.conf` embedded via `include_str!` + `HoconLoader::load_str`. The `default_dir: &Path` parameter dropped from `configuration::builder::build`; `DEFAULT_DIR` env var read in `main.rs` removed. Override semantics unchanged: `--config-file ` and `<data_dir>/rnode.conf` auto-load still apply on top of the embedded baseline.
Kamon eliminated	`KamonConf` struct, `configuration/kamon.rs`, `kamon.conf`, `load_kamon_config` parsing path, and `KamonConf` plumbing through `main.rs` / `mod.rs` / `diagnostics/` all deleted. The two fields the Rust diagnostics actually consumed (`tick_interval` and the InfluxDB endpoint) moved into `NodeConf::Metrics` under a single `metrics { ... }` section in `defaults.conf`.
Dead JVM artifacts	`logback.xml` and `logging-template/*` deleted (never read by any Rust code).
Test-side .rho loading	Preserved via a new `casper/tests/util/rholang/test_rho_loader.rs::load_test_rho` (kept out of the production binary). 20 test files migrated.
Dockerfile	Drops the COPY steps that staged `node/src/main/resources/`, `casper/src/main/resources/`, and `rholang/examples/` into the runtime image.

Net diff: ~80 LOC added, ~370 LOC deleted across 41 files.

Commit 2 (`58f5f776`) — docs(node): align README + Helm chart

Tail-end documentation and config-template cleanup that the first commit implied but didn't touch.

• `README.md`: clarifies that the built-in `defaults.conf` is embedded into the binary at compile time via `include_str!` (not a runtime file lookup).
• `docs/node/README.md`: config build pipeline corrected to `HoconLoader::new().load_str(EMBEDDED_DEFAULTS)`; notes that no `node/src/main/resources/` directory is required at runtime.
• `defaults.conf`: drops the stale `kamon-influxdb` reference from the metrics-section comment (since the embedded file's text now ships in the binary, even comment changes get compiled in).
• Helm chart cleanup: deleted the dead `logback.xml` ConfigMap entry and `/var/lib/rnode/logback.xml` subPath mount; rewrote the Kamon-era explainer comment in the embedded `defaults.conf` template (deployable + observer ConfigMaps) to describe the new `metrics { ... }` schema.

`Justfile` audited — already correct. Recipes pass `--config-file=...` explicitly; no `DEFAULT_DIR` env var, no CWD requirement. Zero changes needed there.

Why this approach

Embed-only (rather than "embed first, fall back to file") was chosen as the production approach. Rationale:

• Single source of truth: everything that ships in the binary ships in the binary. No sidecar files, no fs probing, no CWD dependency.
• Compile-time guarantees: `include_str!` fails the build if the file is missing. The previous code failed at runtime with a multi-path search-error string. Compile-time > runtime for missing-asset bugs.
• Honest dependencies: the binary really does depend on these specific files at compile time; `include_str!` makes that visible to the compiler and to anyone reading the source.
• Smaller code surface: ~290 LOC net deleted (the 8-path fallback ladder + `apply` + `apply_with_env` + file-based template loading + `KamonConf` plumbing).
• No "works on my machine" CWD bugs: the previous fallback ladder (`casper/src/main/resources/X`, `../casper/src/main/resources/X`, `rholang/examples/X`, …) was dev-machine-shaped, not production-shaped.

Test plan

• `cargo build --release --tests --workspace` — clean
• `cargo test --release -p casper --test mod` — 345 passed / 0 failed / 24 ignored (`finished in 61.36s`)
• Standalone smoke test from arbitrary CWD with no env vars: `./target/release/node run --standalone --data-dir /tmp/x --use-random-ports --no-upnp --allow-private-addresses` from `/tmp` (no workspace tree visible) — reaches `"isReady":true` on `/api/status` ~12s after launch; auto-generates self-signed TLS certs in the data dir; data-dir layout (rspace/, eval/, blockstorage/, dagstorage/, casperbuffer/, deploystorage/, reporting/, genesis/) created normally.
• Integration tests against the new binary (planned via SubprocessProvider follow-up — building this PR's binary into the existing Docker image and re-running `integration-tests` is the next acceptance gate before this lands).

Compatibility notes

• Operator-facing config flow unchanged: `--config-file ` and `<data_dir>/rnode.conf` continue to override the embedded defaults exactly as today. The Helm chart still mounts `rnode.conf` into `/var/lib/rnode/rnode.conf`. No deployment-side migration.
• Test fixtures still load `.rho` from disk: tests in `casper/tests/genesis/contracts/` and `casper/tests/helper/rho_spec.rs` use a new test-only `load_test_rho` helper that preserves the historical 8-path search behavior. Test fixtures live in `casper/src/test/resources/` exactly as before.
• Helm chart: removes one dead mount (`logback.xml` was already a no-op for Rust nodes). No operator action required.

Co-Authored-By: Claude noreply@anthropic.com