Cardano Updates

SD+JWT credentials were incorrectly deserialized as JWTCredential
during backup restore. This caused selective disclosure data
(disclosures) to be lost, making restored SD+JWT credentials
unusable for presentations.

The fix uses SDJWTCredential.fromJWS() for the 'sdjwt' recovery_id
instead of JWTCredential.fromJWS(), preserving the full SD-JWT
structure including disclosures.

Closes #458

Signed-off-by: Roland Kuhn <[email protected]>

Co-authored-by: sg-doc-holiday[bot] <219201796+sg-doc-holiday[bot]@users.noreply.github.com>

The upstream library removed cardano-api dependency (PRs #32, #33).
Breaking changes: CardanoApiEra type family removed, Babbage demoted
from RecentEra to non-recent, Dijkstra promoted to RecentEra.

- Add CardanoApiEra shim in Cardano.Api.Extra (temporary, will be
  removed when cardano-api is fully eliminated)
- Replace all RecentEraBabbage patterns with InNonRecentEraBabbage
- Add RecentEraDijkstra error stubs (wallet doesn't support it yet)
- Update test files: remove Babbage-era delegation tests, update
  TransactionSpec imports and pattern matches

The upstream library removed cardano-api dependency (PRs #32, #33).
Breaking changes: CardanoApiEra type family removed, Babbage demoted
from RecentEra to non-recent, Dijkstra promoted to RecentEra.

- Add CardanoApiEra shim in Cardano.Api.Extra (temporary, will be
  removed when cardano-api is fully eliminated)
- Replace all RecentEraBabbage patterns with InNonRecentEraBabbage
- Add RecentEraDijkstra error stubs (wallet doesn't support it yet)
- Update test files: remove Babbage-era delegation tests, update
  TransactionSpec imports and pattern matches

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

Empty stub pages erode reader trust by promising content that doesn't
exist. Delete 18 stubs across all four Diátaxis sections and update
the sidebar accordingly. Topics that need documentation are tracked
for later phases.

Deleted stubs: consensus_protocol, mempool, network_interaction,
starting_up_consensus_layer, genesis_design, managing_updates, ebbs,
storage_layer/{index,immutable_db,volatile_db,ledger_db},
reporting_a_bug, working_with_stored_data/{analysing_a_chain,
serving_a_chain,manipulating_data}, tutorials/{sop,hfc},
references/serialisation.

Also: add one-line descriptions to section index pages, clean up
haddocks.md TODO, fix broken EBB link in ledger_interaction.md.

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