Cardano Updates

* Add missing changelog entries.
* Revert missing cddl section in shelley changelog.
* Convert positional args to record syntax in Examples.

Also,
* Needed some examples re-exported from conway, they seemed to have been
updated, and led to updates to the goldens.

eraLedgerStateQueryGoldenSpec requires full {To,From}JSON+{Enc,Dec}CBOR.
Some query result types do not have all these instances: some lack only
FromJSON, some both {To,From}JSON.

Feature/p1w2 manifest migration and tutorials

The roadmap work has not landed on main yet, so the previous
?branch=main badge URL on every embedded README badge would show "no
recent runs" until the long-running feature branch
feat/ecosystem-monitoring-and-learning-enhancement merges. Switching the
badge URL to ?branch=feat/ecosystem-monitoring-and-learning-enhancement
gives a meaningful status indicator while the roadmap is in progress.

Updated:
- scripts/embed-readme-badges.sh: WORKFLOW_BADGE constant points at the
  roadmap branch. A TEMPORARY comment marks the line so it's flipped
  back to main at roadmap merge time (alongside the workflow's own
  TEMPORARY: long-running feature branch line).
- All 22 README files (top-level + 21 use cases): the badge URL between
  the CI_BADGE_BLOCK_BEGIN/END markers swapped from ?branch=main to
  ?branch=feat/ecosystem-monitoring-and-learning-enhancement.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

improve and focus the schema

(a) scripts/local-test-discovery.sh header documented manifest-coverage as
    {total, with_manifest, with_heuristic} but the actual emit is just
    {total, with_manifest}. Header updated to match.

(b) .github/workflows/ecosystem-test.yml header still said legacy use
    cases "fall through the dual-mode discovery" — contradicts the
    hard-error behavior introduced in iteration 1. Rewrote the header to
    describe the manifest-only contract.

(c) docs/README.md overstated drift coverage ("every combination on a
    nightly drift schedule") — actually nightly drift runs discovery + an
    Aiken compile pass, not the full offchain matrix. Section also did
    not warn learners that the embedded README badges are repo-wide
    workflow badges, not per-cell. Rewrote the "I'm here to track
    ecosystem health" block to be explicit about both: drift coverage
    scope, and badge granularity.

.codex-reviews/p1w2.md: iteration 2 actions logged.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

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

Version 2

Addresses Codex iteration 1's NOT CONVERGED verdict.

(2) Discovery hard-errors on bad manifests, no more silent cell drops:
unknown manifest_key (no matching frameworks/<key>.yml), kind/section
mismatch (descriptor declares kind: onchain but the key is under offchain:),
and missing example.yml are all collected during the walk and reported as
::error:: with the offending entry list, then exit 1. Smoke-tested by
injecting a typo into escrow's offchain: section.

(4) Stale heuristic-fallback docs cleaned up:
- frameworks/SCHEMA.md "Discovery" rewritten to describe manifest-only
  semantics and the unknown-key error.
- escrow/example.yml's "falls back to legacy filename heuristics" comment
  removed; replaced with the unknown-key-is-an-error rule.
- vesting/example.yml's note rephrased as historical context (vesting/
  offchain/meshjs/ has no deno.json; the manifest now declares it
  explicitly).

(3) README-badge limitation made explicit:
- scripts/embed-readme-badges.sh comment block now states honestly that
  every embedded badge points at the same workflow status, not per-cell.
- docs/README.md "I'm here to learn" notes that README quality varies and
  the 5 starting-path use cases are first-targeted for tutorial rewrites.

(1, partial) Tutorial-grade READMEs for 4 of the 5 starting-path use
cases — simple-transfer, vesting, htlc, escrow — rewritten to the plan's
template (What this is / Why it matters / How the onchain logic works /
How to use it offchain / Try it yourself / What's tested in CI /
Variations to explore). atomic-transaction's existing README is already
content-rich and covers the same ground in a different structure;
left untouched. The other 16 use cases keep their original READMEs;
docs/README.md and docs/learn.md are now honest about the uneven state
and the remaining rewrites are tracked as ongoing rather than blocking
P1W2 close.

.codex-reviews/p1w2.md: iteration 1 actions logged.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

- --grep now prints directly to stdout, keeping greppable out of TraceMessage
- Context printout replaced with a ContextDump TraceMessage at Debug severity