feat(consensus): Phase 1.4 — Consensus PoA canonical Aura+GRANDPA v0.0.6

Origin Chain runtime canonical ahora produces blocks + finalizes via
Aura+GRANDPA per CHN-1 ratified. PoA Phase 1 substrate fundación bien anclada.

## Pallets añadidos canonical (per SBS-4)

- Index 4 Aura (pallet_aura 39.0.0) — block production canonical PoA per CHN-1
  Round-Robin 6-segundo slots alineados Pi 5 + NVMe SSD. AuraId sr25519.
- Index 5 Grandpa (pallet_grandpa 40.0.0) — finality gadget per CHN-1
  2/3 honest majority irreversible confirmation. GrandpaId Ed25519.

## Primitives consumidas
- sp-consensus-aura 0.42.0 (feature serde canonical)
- sp-consensus-grandpa 23.0.0 → 23.1.0 (feature serde canonical)

## Configs canonical
- pallet_aura::Config: MaxAuthorities 32 + AllowMultipleBlocksPerSlot false
  + SlotDuration = MinimumPeriodTimesTwo (clock↔consensus coupling canonical)
- pallet_grandpa::Config: MaxAuthorities 32 + MaxNominators 0 + KeyOwnerProof
  Void + EquivocationReportSystem () (Phase 1 simple, real Phase 2 NPoS)

## Wiring canonical clock↔consensus
pallet_timestamp::OnTimestampSet = crate::Aura (was ()) — cada nuevo
timestamp triggera Aura slot advance canonical. Materializa 6-segundo block
production deterministic Pi 5.

## Opaque SessionKeys canonical (nuevo opaque.rs module)
impl_opaque_keys! con aura (sr25519) + grandpa (Ed25519) — substrate canonical
pattern para forkless runtime upgrades. Cada validator posee 2 keys canonical.
Pre-Phase 1.5: static keys en genesis chain_spec. Phase 1.5: pallet_session
introduces rotation 4h epochs per CHN-1.

## Filosofía canonical
opaque.rs cita David canon 2026-05-14 "la libertad infinita acota solo donde
empieza la del otro" — opaque types son la frontera canonical entre node
sovereignty + runtime sovereignty. Each layer respeta la libertad del otro.

## Build + tests
- cargo check 6.17s warm cache (Aura+Grandpa deps incremental)
- cargo build --release 8.64s warm cache clean
- ~57 tests passing (count preserved — Aura/Grandpa tests llegan Phase 1.5+)

## Edge case empírico
pallet-aura 39.0.0 + pallet-grandpa 40.0.0 NO exponen feature
runtime-benchmarks en stable2512 canonical. Wire-up benchmark scaffolding
land Phase 1.5+ cuando pallet_session se integre.

## Phase 1 progress
1.1 ✅ + 1.2 ✅ + 1.3 ✅ + 1.4 ✅ (esta). Next: 1.5 pallet_session validator
rotation 4h epochs per CHN-1.

Origin Chain runtime composition canonical actual (6 pallets):
- 0 System + 1 Timestamp + 2 Balances + 3 TransactionPayment
- 4 Aura + 5 Grandpa
- Opaque SessionKeys: aura sr25519 + grandpa Ed25519

Refs: CHARON_ROADMAP_V1 Phase 1.4, CHN-1 ratified Aura+GRANDPA canonical,
SBS-4 ratified extended pallet set

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -46,8 +46,8 @@ sp-transaction-pool = { version = "36.0.0", default-features = false }
 sp-inherents = { version = "36.0.0", default-features = false }
 sp-offchain = { version = "36.0.0", default-features = false }
 sp-session = { version = "37.0.0", default-features = false }
-sp-consensus-aura = { version = "0.42.0", default-features = false }
-sp-consensus-grandpa = { version = "23.0.0", default-features = false }
+sp-consensus-aura = { version = "0.42.0", default-features = false, features = ["serde"] }
+sp-consensus-grandpa = { version = "23.1.0", default-features = false, features = ["serde"] }
 
 # FRAME canonical — runtime composition framework
 frame-system = { version = "40.1.0", default-features = false }
@@ -61,6 +61,10 @@ pallet-balances = { version = "41.1.0", default-features = false }
 pallet-timestamp = { version = "39.0.0", default-features = false }
 pallet-transaction-payment = { version = "40.0.0", default-features = false }
 
+# FRAME pallets canonical Phase 1.4 — Consensus PoA per CHN-1 ratified
+pallet-aura = { version = "39.0.0", default-features = false }
+pallet-grandpa = { version = "40.0.0", default-features = false }
+
 # SCALE codec canonical (canonical Substrate serialization)
 parity-scale-codec = { version = "3.7", default-features = false, features = ["derive"] }
 scale-info = { version = "2.11", default-features = false, features = ["derive"] }