v0.1.4 — documentation fixes from the Foundation review

Documentation and developer-experience fixes from the Canton Foundation review
of the M1 submission. No library code changes; 0.1.3 and 0.1.4 are the same
SDK.

Fixed

• Examples: version_and_health and submit_and_read read the same
  CANTON_TEST_* variables as the live tests (the unprefixed CANTON_*
  spellings still work and take precedence). They previously required a second,
  undocumented set of six names, so following the README's own setup and then
  running the example it links to failed on set CANTON_TOKEN_URL.
• Live tests: the ACS token-paging test no longer caps the walk at 500
  pages. At page size 1 that bounded the ledger rather than the loop, so on a
  participant with a few hundred contracts a healthy walk reported "paging did
  not terminate". It now fails when the page token stops advancing, which is
  the condition it was meant to catch.

Documentation

• README: the live-test variables are documented under their real names
  (every one is CANTON_TEST_-prefixed) in a table that says what each gates,
  with a copy-pasteable export block. CANTON_TEST_JSON_ENDPOINT (the JSON and
  WebSocket tests) and CANTON_TEST_SYNC_ID were previously undocumented, and
  six names were listed without their prefix.
• README: node setup lists the
  Canton Builder Tool
  and Splice LocalNet
  alongside cn-quickstart, with what each one actually provides: Splice
  LocalNet is unauthenticated, so the OIDC-gated tests skip there as well as the
  command-submission ones; the Builder Tool's canton builder deploy uploads a
  DAR, which is how to get CANTON_TEST_LICENSING_PKG without cn-quickstart.

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All six crates release in lockstep at 0.1.4 (canton, canton-core, canton-proto, canton-auth, canton-ledger, canton-admin) — mix only equal versions.

cargo add canton@0.1.4