wip: add long message helpers and payload type controls

- add centralized message validation errors
- switch command handlers to return error
- add explicit long plain-text reply helpers
- support strict payload type policy with debug logging
- document versioning and changelog workflow
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2026-03-26 18:15:06 +03:00
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# Changelog
## v1.0.0-rc.12
### Added
- `AnswerLong(...)`, `AnswerLongf(...)`, `KeyboardLong(...)`, and `SplitMessageText(...)` for explicit plain-text splitting of long replies without changing the semantics of existing single-message helpers.
- Centralized library-level validation errors in `errors.go`, including `ErrEmptyMessage`, `ErrMessageTooLong`, `ErrCaptionTooLong`, and context/target validation sentinels.
- `Bot.GetPayloadType()`, `InlineKeyboard.GetPayloadType()`, and optional strict payload decoding via `BotOpts.StrictPayloadType` / `Bot.SetStrictPayloadType(...)`.
### Changed
- `CommandExecutor` now returns `error`, and command, payload, and non-command update handlers now use centralized bot error handling for returned errors.
- README and README_RU examples now use the new handler signature and document the long-message helpers.
- `AGENTS.md` now requires every change to be recorded in `CHANGELOG.md`, enforces version alignment with `utils/version.go`, and blocks breaking changes without a major-version bump.
- Payload-type comments and docs now distinguish between the bot's default payload type and keyboard-local overrides.
- Version constants were bumped to `v1.0.0-rc.12`.
### Fixed
- Message and caption validation now runs before Telegram API calls, rejecting empty messages, oversized message text, and oversized captions with stable sentinel errors.
- Draft flushing and draft updates now reject oversized messages before sending invalid requests.
- Callback payload decoding now optionally enforces strict type matching, while the default tolerant mode logs Base64-to-JSON decoding in debug mode and still accepts keyboard-local payload overrides.
### Breaking Changes
- `CommandExecutor[T]` changed from `func(ctx *MsgContext, db T)` to `func(ctx *MsgContext, db T) error`.
- `Plugin.NewCommand(...)`, `Plugin.NewPayload(...)`, and `Plugin.AddUpdateHandler(...)` now require handlers with the new error-returning signature.
## v1.0.0-rc.11
### Fixed