chore: scaffold moments workspace

Cargo workspace with five crates per architecture conventions:

- moments-entities: Source enum, Event, EventQuery, SourceSummary
- moments-core:     EventReader / EventWriter ports
- moments-data:     PgStore (sqlx postgres adapter) + 0001_init.sql
- moments-api:      axum binary; /v1/{healthz,events,sources}
- moments-worker:   skeleton; pollers land in step 2

Sources committed-to for ingestion: github, gitea, hg, bugzilla.
Workstation events explicitly retired (not deferred).

Build + clippy clean. sqlx queries use the runtime API for now;
will switch to compile-time-checked macros + .sqlx offline cache
once magrathea has the moments_{ro,rw} roles and database created.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,36 @@
+[workspace]
+resolver = "3"
+members = ["crates/*"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2024"
+rust-version = "1.85"
+license = "GPL-3.0-or-later"
+authors = ["Rob Thijssen <rthijssen@gmail.com>"]
+
+[workspace.dependencies]
+# entities
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+chrono = { version = "0.4", default-features = false, features = ["serde", "clock"] }
+thiserror = "2"
+
+# core / data
+sqlx = { version = "0.8", default-features = false, features = ["postgres", "runtime-tokio-rustls", "macros", "migrate", "chrono", "json"] }
+
+# binaries
+tokio = { version = "1", features = ["rt-multi-thread", "macros", "signal", "time"] }
+axum = "0.8"
+tower-http = { version = "0.6", features = ["trace", "cors"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
+anyhow = "1"
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "json", "gzip"] }
+figment = { version = "0.10", features = ["toml", "env"] }
+clap = { version = "4", features = ["derive", "env"] }
+
+# internal
+moments-entities = { path = "crates/moments-entities", version = "=0.1.0" }
+moments-core = { path = "crates/moments-core", version = "=0.1.0" }
+moments-data = { path = "crates/moments-data", version = "=0.1.0" }