Add validated identifiers, Hash32, Timestamp and DataClass to proto

Implemented-By: Laguna S 2.1 (OpenCode)

docs/dependencies.md

@@ -4,3 +4,6 @@ Every external crate has a row here. `scripts/check-dep-docs.sh` enforces it.
 
 | Crate | Version | Used by | Why |
 |---|---|---|---|
+| `serde` | 1.0.229 | `proto` | Derives serialization for every shared type. MIT OR Apache-2.0. |
+| `serde_json` | 1.0.151 | `proto` | JSON for frames and log files. MIT OR Apache-2.0. |
+| `humantime` | 2.4.0 | `proto` | RFC 3339 timestamps. No dependencies of its own. MIT OR Apache-2.0. |

docs/implementer-log.md

@@ -6,5 +6,6 @@ reviewer adds findings under "Reviews" once per milestone.
 | Task | Date | Status | Gate runs | First gate | Deviations | Notes |
 |---|---|---|---|---|---|---|
 | M1/01-workspace-and-gate | 2026-09-17 | done | 1 | pass | none | Crate skeletons, Cargo files and the given Makefile/deny.toml/test-gate-scripts.sh were already present untracked from a prior attempt; I verified them against the plan and created only the missing gate scripts, dependencies.md, egress.md and this log row. |
+| M1/02-proto-values | 2026-09-17 | done | 1 | pass | none | Implemented ValueError, SessionId, Epoch, CallId, Hash32 and Timestamp in crates/proto/src/ids.rs and DataClass in class.rs, using serde try_from/into for string-backed JSON validation, a hand-written hex encoder and humantime for RFC 3339 parsing with canonical re-serialization. |
 
 ## Reviews