feat(evm): inspect lossless Solidity terminal CBOR metadata (#2790)

feat(evm): retain lossless terminal CBOR metadata

Refs morluto/rea#2388

Co-authored-by: Matheus Breguêz <matbrgz@gmail.com>
Co-authored-by: Codex <noreply@openai.com>

docs/evm-bytecode.md

@@ -39,6 +39,18 @@ license](https://github.com/morluto/rea/blob/main/third_party/evmole/README.md)
 - Upstream also returns terminal metadata during selector recovery. Its reported
   values remain in `raw_result`; integer precision and non-text-key coverage are
   unknown in the JS binding. Full bytecode retains the original encoded metadata.
+- `bytecode.metadata` independently interprets a plausible terminal CBOR root
+  map from the selected bytes. Integers use decimal strings; byte strings use hex,
+  and scalar keys retain their types. The recorded offset/length addresses the
+  original bytecode, so summary delivery does not copy an opaque CBOR payload.
+  Nested containers have partial scalar coverage; unsupported or malformed
+  candidates report `not-decoded` with a diagnostic. Decoding is bounded to 64
+  container levels and the terminal payload's encoded size.
+- An unavailable trailer does not prove metadata absence or Solidity origin.
+  Compiler-version bytes/text are metadata declarations, not verified compiler,
+  source-file or deployed-contract identity. Historical omission parses as a null
+  unknown facet without changing the original Evidence record. Metadata/source
+  URLs are not fetched.
 - Selectors, argument strings and state mutability are **inferences**. Function
   names/signatures are not looked up. Optimized code may produce different
   mutability candidates; recovered types are not a verified source ABI.
@@ -125,3 +137,15 @@ The real verification lane traces representative raw/hex CLI workflows and check
 that only declared Node/prlimit launchers and process ownership inspection run.
 Socket traces permit local stdio socket pairs and reject attempted network requests.
 These observations verify those fixtures; they are not a general network sandbox.
+
+For the independent metadata parser, `npm run verify:solidity:metadata` uses an
+existing caller-selected solc 0.8.30 module:
+
+```sh
+REA_VERIFY_SOLC_MODULE=/absolute/path/to/solc/index.js npm run verify:solidity:metadata
+```
+
+It compiles the owned fixture with unoptimized, viaIR, content-hash-free and
+CBOR-free settings, verifies the observed trailer facts and reports local decode
+timings. No contract is executed. This lane does not establish the complete
+Linux EVM provider's CLI/MCP, resource-limit or cleanup behavior.