Cardano Updates

The node-snapshot (tvar) import path derived the current era's epoch size
from the network default (86400), ignoring custom-testnet genesis. Load the
history.<slot>.<hash>.json sidecar (as the .cbor path already does via
make_era_history) and use it to interpret the snapshot, but only for
Testnet(_); public networks keep the snapshot-derived history unchanged.

Signed-off-by: paolino <[email protected]>

Two sites in amaru-ledger/src/state.rs were doing unchecked Epoch
subtraction on a u64-backed Epoch, producing u64::MAX-1 (or panicking,
depending on overflow checks) when the latest snapshot or the
slot-derived current epoch was below the rewards/leader-schedule
horizon (epoch < 2):

- StakeDistributionObserver::get_pool: `current_epoch - 2` becomes
  saturating_sub(2). Headers validated very early in the chain (or
  with a custom era history that maps slots to low epoch numbers)
  no longer surface a misleading
  "no stake distribution available for pool access 18446744073709551614"
  — the error now correctly says "pool access 0" and points at a
  real missing snapshot.

- initial_stake_distributions: `latest_epoch - Epoch::from(2)` and
  `- Epoch::from(1)` become saturating_sub(2) / saturating_sub(1).
  Bundles produced by amaru-bootstrap from cold-start short-epoch
  testnets (e.g. lambdasistemi/amaru-bootstrap#34's antithesis
  reproducer) where the most_recent_snapshot is epoch 0 or 1 no
  longer hit a u64 underflow on Ledger::new; for_epoch(0) is
  exercised normally and surfaces a sensible StoreError if the
  snapshot is genuinely absent.

This is a defensive correctness improvement only — it does not change
behaviour for any chain past epoch 2. Surfaced by the new live
amaru-run consumer test in lambdasistemi/amaru-bootstrap#35.

Signed-off-by: Paolo Veronelli <[email protected]>
Signed-off-by: paolino <[email protected]>

assert_leader_stake currently computes c = ln(1 - active_slot_coeff)
unconditionally. For genesis params with activeSlotsCoeff = 1.0
(used by the antithesis short-epoch fixture in
lambdasistemi/amaru-bootstrap and by the live consumer test in
lambdasistemi/amaru-bootstrap#35) this is ln(0), and pallas-math's
FixedDecimal::ln panics with "ln of a value in (-inf,0] is undefined".

When f = 1, every slot is leader-elected with probability 1 — the
leader-stake assertion is trivially satisfied for any pool with
non-zero relative stake. Mirroring the pre-existing zero-active-stake
guard added in b69fa13e, short-circuit to Ok before the ln call.

The math is continuous at f -> 1 (exp(x*c) with c -> -inf collapses
to 0, which is < recip_q, so the ordering is LT = Ok), so the guard
does not change behaviour for any f < 1.

Surfaced by the live amaru-run consumer test in
lambdasistemi/amaru-bootstrap#35 once
lambdasistemi/amaru#2 (saturating epoch subtraction) let header
validation reach this code path on a cold-start short-epoch chain.

Signed-off-by: Paolo Veronelli <[email protected]>
Signed-off-by: paolino <[email protected]>

Port of lambdasistemi 36ea009c onto upstream/main's rewritten state.rs.

Generated private testnets (db-synthesizer / amaru-bootstrap) can serve
block headers from the next leader schedule before the stable ledger
has materialized that epoch's snapshot. Add an opt-in forecast on
StakeDistributionObserver::get_pool that falls back to the latest
cached distribution when the requested epoch is strictly newer; only
enabled for NetworkName::Testnet(_).

Public networks (mainnet/preprod/preview) keep the existing strict
lookup behaviour.

Signed-off-by: paolino <[email protected]>

Signed-off-by: paolino <[email protected]>

Signed-off-by: paolino <[email protected]>

Signed-off-by: paolino <[email protected]>

stability_window=3k/f=150 and randomness_stabilization_window=4k/f=200 must
be smaller than the epoch; the previous epoch_length=120 made the rewards
stake snapshot never stabilize in-epoch, so the relay died with
RewardsSummaryNotReady at the first boundary. 256 clears both windows.

* mithril-cardano-node-chain from `0.1.26` to `0.1.27`
* mithril-dmq from `0.1.25` to `0.1.26`
* mithril-end-to-end from `0.4.138` to `0.4.139`
* mithril-infra/assets/infra.version from `0.5.15` to `0.5.16`
* mithril-test-lab/cardano-devnet/VERSION from `0.4.36` to `0.4.37`

Bumps [github.com/blinklabs-io/gouroboros](https://github.com/blinklabs-io/gouroboros) from 0.180.1 to 0.181.0.
- [Release notes](https://github.com/blinklabs-io/gouroboros/releases)
- [Changelog](https://github.com/blinklabs-io/gouroboros/blob/main/RELEASE_NOTES.md)
- [Commits](https://github.com/blinklabs-io/gouroboros/compare/v0.180.1...v0.181.0)

---
updated-dependencies:
- dependency-name: github.com/blinklabs-io/gouroboros
  dependency-version: 0.181.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [golang.org/x/image](https://github.com/golang/image) from 0.41.0 to 0.42.0.
- [Commits](https://github.com/golang/image/compare/v0.41.0...v0.42.0)

---
updated-dependencies:
- dependency-name: golang.org/x/image
  dependency-version: 0.42.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [github.com/SundaeSwap-finance/kugo](https://github.com/SundaeSwap-finance/kugo) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/SundaeSwap-finance/kugo/releases)
- [Changelog](https://github.com/SundaeSwap-finance/kugo/blob/main/CHANGELOG.md)
- [Commits](https://github.com/SundaeSwap-finance/kugo/compare/v1.3.0...v1.3.1)

---
updated-dependencies:
- dependency-name: github.com/SundaeSwap-finance/kugo
  dependency-version: 1.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [github.com/blinklabs-io/plutigo](https://github.com/blinklabs-io/plutigo) from 0.1.14 to 0.1.15.
- [Release notes](https://github.com/blinklabs-io/plutigo/releases)
- [Changelog](https://github.com/blinklabs-io/plutigo/blob/main/RELEASE_NOTES.md)
- [Commits](https://github.com/blinklabs-io/plutigo/compare/v0.1.14...v0.1.15)

---
updated-dependencies:
- dependency-name: github.com/blinklabs-io/plutigo
  dependency-version: 0.1.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: Chris Gianelloni <[email protected]>

Bumps the actions-deps group with 7 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [actions/checkout](https://github.com/actions/checkout) | `6.0.2` | `6.0.3` |
| [github/codeql-action](https://github.com/github/codeql-action) | `4.36.0` | `4.36.2` |
| [hoverkraft-tech/compose-action](https://github.com/hoverkraft-tech/compose-action) | `2.6.0` | `3.0.0` |
| [rtCamp/action-slack-notify](https://github.com/rtcamp/action-slack-notify) | `2.3.3` | `2.4.0` |
| [docker/setup-qemu-action](https://github.com/docker/setup-qemu-action) | `4.0.0` | `4.1.0` |
| [scalacenter/sbt-dependency-submission](https://github.com/scalacenter/sbt-dependency-submission) | `3.2.2` | `3.2.3` |
| [scala-steward-org/scala-steward-action](https://github.com/scala-steward-org/scala-steward-action) | `2.88.0` | `2.90.0` |



Updates `actions/checkout` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/de0fac2e4500dabe0009e67214ff5f5447ce83dd...df4cb1c069e1874edd31b4311f1884172cec0e10)

Updates `github/codeql-action` from 4.36.0 to 4.36.2
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/github/codeql-action/compare/7211b7c8077ea37d8641b6271f6a365a22a5fbfa...8aad20d150bbac5944a9f9d289da16a4b0d87c1e)

Updates `hoverkraft-tech/compose-action` from 2.6.0 to 3.0.0
- [Release notes](https://github.com/hoverkraft-tech/compose-action/releases)
- [Commits](https://github.com/hoverkraft-tech/compose-action/compare/d2bee4f07e8ca410d6b196d00f90c12e7d48c33a...11beaa1c2dae4e8ed7b1665aa074723b6cecb0e4)

Updates `rtCamp/action-slack-notify` from 2.3.3 to 2.4.0
- [Release notes](https://github.com/rtcamp/action-slack-notify/releases)
- [Commits](https://github.com/rtcamp/action-slack-notify/compare/e31e87e03dd19038e411e38ae27cbad084a90661...33ca3be66c6f378fe1610fd1d5258632dbed5e58)

Updates `docker/setup-qemu-action` from 4.0.0 to 4.1.0
- [Release notes](https://github.com/docker/setup-qemu-action/releases)
- [Commits](https://github.com/docker/setup-qemu-action/compare/ce360397dd3f832beb865e1373c09c0e9f86d70a...06116385d9baf250c9f4dcb4858b16962ea869c3)

Updates `scalacenter/sbt-dependency-submission` from 3.2.2 to 3.2.3
- [Release notes](https://github.com/scalacenter/sbt-dependency-submission/releases)
- [Commits](https://github.com/scalacenter/sbt-dependency-submission/compare/1cc96a7038ea2b014c200c1dae3a0cc92293b91d...d84eef4c09e633bcf5f113bcad7fd5e9af1baee9)

Updates `scala-steward-org/scala-steward-action` from 2.88.0 to 2.90.0
- [Release notes](https://github.com/scala-steward-org/scala-steward-action/releases)
- [Commits](https://github.com/scala-steward-org/scala-steward-action/compare/b186ab858ce163f9af7b016fac32cfb3f2c2f503...708c1d682b14b9785201afb25c8ffece0a9d126f)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions-deps
- dependency-name: github/codeql-action
  dependency-version: 4.36.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions-deps
- dependency-name: hoverkraft-tech/compose-action
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions-deps
- dependency-name: rtCamp/action-slack-notify
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions-deps
- dependency-name: docker/setup-qemu-action
  dependency-version: 4.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions-deps
- dependency-name: scalacenter/sbt-dependency-submission
  dependency-version: 3.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions-deps
- dependency-name: scala-steward-org/scala-steward-action
  dependency-version: 2.90.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions-deps
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: Chris Gianelloni <[email protected]>

Signed-off-by: Eric Torreborre <[email protected]>