Cardano Updates

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.

Block arrival now drives chain selection directly: on_block_received
calls try_switch_to(this_block), which walks chain_tree backward to
find the common ancestor with the adopted chain and switches if all
intermediate blocks are cached. No peer chain consultation needed.

Fetch decisions are separate: evaluate_and_fetch examines peer chains
to determine what blocks to request, handles OrphanCandidate
re-intersection, and issues FetchBlockRange commands.

This separation means a node that receives blocks from any source
can immediately apply them without depending on peer chain state
that may be stale or fragmented after rollbacks.

Cluster tested: 25 nodes at p=0.2 for 20 minutes (350+ blocks),
zero stuck nodes. Previously 7-13 nodes would get permanently stuck.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

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

feat(transaction_group): handle subprocess.TimeoutExpired in tx submission

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

Handle subprocess.TimeoutExpired exceptions during transaction submission to improve robustness.

Active maintainers:
- Add Fabio Pinheiro (FabioPinheiro) and Allain Magyar (amagyar-iohk)
- Update Pat Losoponkul GitHub ID from patlo-iog to patextreme
- Update GitHub team from open-enterprise-agent-maintainers to
  identus-maintainers
- Update company affiliation from IOHK to IOG
- Fix sublist formatting in "Becoming a Maintainer" section

Emeritus maintainers:
- Move Björn Sandmann (bsandmann), David Poltorak (davidpoltorak-io),
  and Shailesh Patil (mineme0110) to emeritus

Signed-off-by: Yurii Shynbuiev <[email protected]>
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Signed-off-by: Yurii Shynbuiev <[email protected]>

Add the mass lint auto-fix commit (03b3786) to the blame ignore list
so git blame skips past formatting-only changes.

Signed-off-by: Yurii Shynbuiev <[email protected]>
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Signed-off-by: Yurii Shynbuiev <[email protected]>

Markdownlint auto-fix (--fix) resolved ~1000 issues:
- MD009: trailing spaces
- MD012: multiple consecutive blank lines
- MD022: missing blank lines around headings
- MD031: missing blank lines around fenced code blocks
- MD032: missing blank lines around lists
- MD047: missing final newline

Manual fixes:
- MD060: reformat misaligned tables in MAINTAINERS.md, infrastructure
  READMEs, vdr/manage.md, research doc
- MD051: fix broken anchor link in signing-commits.md
- MD028: merge consecutive blockquotes in linting.md
- MD029: fix numbered list continuity in credentialdefinition/create.md,
  credentials/connectionless/issue.md, schemas/create.md,
  authserver-oid4vci-contract.md

YAML fixes:
- Add final newline to dependabot.yml and apisix config.yaml
- Trim trailing spaces in .allstar/binary_artifacts.yaml

ShellCheck fixes:
- SC2155: separate declare and assign in keycloak/init-script.sh and
  get-versions.sh
- SC2164: add || exit after cd in get-versions.sh
- SC2034: export PORT in multi/stop.sh

Signed-off-by: Yurii Shynbuiev <[email protected]>
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Signed-off-by: Yurii Shynbuiev <[email protected]>

Remove CHANGELOG.md from castor/, cloud-agent/service/, connect/,
mercury/, pollux/, and prism-node/client/scala-client/.

The root CHANGELOG.md is the single source of truth for release notes.

Signed-off-by: Yurii Shynbuiev <[email protected]>
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Signed-off-by: Yurii Shynbuiev <[email protected]>

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