Fix more generated-CLI behavior bugs via patches (stopgap for upstream)

[Kevin-Chant]

Features and Changes

A second batch of stopgap fixes for behavior bugs found smoke-testing the CLI, each carried as a .speakeasy/patches/ override that re-applies on every regen (pending upstream Speakeasy/spec fixes). Follows #14.

• Pagination hint. HasMorePages now reads the response body's own hasMore flag instead of the SDK's Next closure, which is assigned unconditionally and so was always non-nil — the "more pages available" hint printed after every list command, and even after --dry-run. Now it prints only when more pages actually exist.
• --body - reads stdin. A lone - was parsed as literal JSON (invalid character '-' in numeric literal). It now follows the Unix idiom and reads the body from stdin, in both the whole-body and per-field body paths.
• Flag metavars. Cobra's UnquoteUsage treats the first back-quoted word in a flag's description as the metavar placeholder, so markdown backticks in spec descriptions produced junk like --prerequisites true, --rules allEnvironments. RegisterFlags now strips backticks before registration → --prerequisites stringArray, --rules string. This also cleans the 50 regenerated doc files.
• TOON / pretty trailing newline. Both now emit exactly one trailing newline instead of gluing to the next shell line.
• settings get schema drift. Org settings can hold values that don't match the strict typed schema (e.g. updateSchedule.hours stored as a string). The command now falls back to a lenient generic decode so it succeeds in every output format instead of hard-failing. In agent mode, a response-decode error is classified as response_error with an actionable hint rather than connection_error / "check network connectivity".
• Doubled binary name. get-SDK-payload and post-copy-transform examples no longer read growthbook growthbook <cmd>.
• v1 deprecation notice now links the full MIGRATION.md URL.

Generation bumped the version 1.1.1 → 1.1.2.

⚠️ --body - and the metavar change alter user-facing flag behavior/help (and the docs surface), though neither is a breaking change for existing scripts.

Upstream tracking

Each class of bug has a tracking issue so we know what's still waiting on upstream and how to retire the patch (not auto-closed by this PR — the patches are stopgaps): #24 (pagination hint), #25 (--body -), #26 (backtick metavars), #27 (trailing newline), #28 (agent-mode decode classification), #29 (doubled binary name), #30 (--usage KDL — unpatched), #31 (settings.hours — back-end/spec).

Known issues (deferred)

• --usage KDL still lists table. A patch for this conflicts on every version bump (the table string shares the single 260 KB KDL line with version "1.1.1"), so it's un-shippable as a stable patch. Human-facing --help is already correct; only the machine-readable schema is affected. Best fixed upstream.
• settings.hours typing — the root fix (type hours to tolerate a string, or coerce in the back-end) belongs in the spec; tracked separately. This PR only makes the CLI degrade gracefully.
• Revision subcommand renames (raw operationIds → clean verbs) will land in a separate follow-up.

Testing

• speakeasy run applies all 8 code patches cleanly; staticcheck + go test ./... pass; binary builds (growthbook 1.1.2).
• go generate ./... — command-surface golden refreshed.
• echo '{"id":"test"}' | growthbook features create --body - --dry-run → body populated from stdin (no parse error).
• growthbook features create --help → metavars render as string / stringArray, backticks gone.
• growthbook --help → output-format no longer lists table.
• Pretty output ends with exactly one trailing newline (unit test).