… and hardening

- Move SilenceErrors to root command, remove from 21 leaf commands (N17)
- Add input validation for AuthorizeService and AuthorizeClientCredentials (6.2.3)
- Save/restore browser.Stdout around OpenURL call (6.2.5)
- Add defer listener.Close() in OAuth flow (N14)
- Reject multiple tokens in resolveToken() (6.1.8)
- Default version variable to "dev" for local builds (N16)
- Add unit tests for all validators (43)
- Add unicode/special char tests for pretty JSON (44)
- Update CLAUDE.md with completed items

Replace 4 nearly-identical files in each of cmd/validate/ and cmd/invalidate/
with a single file using a factory pattern. Public API unchanged.

Remove the RegisterURL config field and --url flag from the dcr register
command. The registration endpoint is now derived from the IMS base URL
(persistent --url/-U flag) by appending /ims/register.

- -p always means --clientSecret (was -s in authz jwt and invalidate serviceToken)
- -s always means --scopes (no longer overloaded)
- -a always means --*ApiVersion (no longer overloaded)
- --account gets -A, --authorizationCode gets -x, --cascading gets -C, --authSrc gets -A

Remove PKCE field from Config — it was not user configuration but a
command-level decision. The pkce command now calls AuthorizeUserPKCE()
directly instead of mutating the shared Config pointer.

…ON, URL slash

- Zero private key bytes after use in JWT exchange to prevent key material
  lingering in memory until GC (6.1.7)
- Add port validation to validateAuthorizeUserConfig, remove defaultPort
  fallback so the ims package validates its own parameters (N10)
- Replace map[string]interface{} with anonymous struct in refresh command
  for deterministic JSON field order and better performance (N11)
- Trim trailing slash from IMS URL before building JWT claim keys to
  prevent double-slash in metascope URIs (6.2.10)
- Standardize orgs API version error message to match profile style (6.2.12)
- Document PersistentPreRunE override risk in README.md (N7)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

The Expires field was set in jwt_exchange.go, exchange.go, and refresh.go
but never read by any caller. The calculations were also wrong:
duration * duration produces nanoseconds-squared (overflow), and
refresh.go used time.Second while the others used time.Millisecond.

Remove the field entirely rather than fixing dead code.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Miscellaneous hardening: key zeroing, port validation, struct JSON

Split AuthorizeUser into AuthorizeUser and AuthorizeUserPKCE

Standardize flag shorthands across all commands

Use IMS base URL for DCR registration

…idate

Deduplicate validate and invalidate subcommands