core: implement display for typed ids

TASKS.md

@@ -2,18 +2,18 @@
 
 ## Current
 
-### `feat/id-display-support`
+### `feat/secret-crypto-hkdf`
 
 Status: in_progress
 
 DoD:
-- `define_id!` implements `Display`
-- formatting with typed ids no longer requires pervasive `.as_str()`
-- the workspace builds cleanly after the macro change
+- master key derivation uses HKDF-SHA256 instead of raw SHA256
+- secret encryption/decryption compatibility is explicit and tested
+- admin-api and runtime continue to handle secret crypto through the shared path
 
 ## Next
 
-- `feat/secret-crypto-hkdf`
+- `feat/postgres-pool-config`
 
 ## Backlog