feat(Concentration): v1.0.0 Refactor Concentration internals and docs.

Concentration/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2026-05-23
+
+### Added
+
+- Dedicated legacy and Beacon spell-detection paths.
+- Support Mode for debug output with two levels:
+  - Basic: short support-friendly diagnostics.
+  - Detailed: structured diagnostics for troubleshooting.
+- Pending roll ID flow for Roll and Advantage buttons.
+- Pending roll cleanup for expired entries.
+- Guarded CON save modifier lookup helper.
+- Documentation set for compatibility and testing:
+  - `docs/beacon-compatibility.md`
+  - `docs/troubleshooting.md`
+  - `docs/testing-checklist.md`
+
+### Changed
+
+- Updated script and package versioning to `1.0.0`.
+- Hardened Beacon matching heuristics for concentration spell cards.
+- Improved character resolution using character ID first, then exact-name fallback.
+- Preferred represented tokens on the caster's current page before global fallback.
+- Refreshed README and metadata for current Roll20/Beacon behavior.
+- Refactored API input handling into dedicated parse/dispatch helpers.
+- Refactored HP-loss concentration flow into focused reminder/button/tracking helpers.
+- Added JSDoc typedefs and function docs for core detection, command, roll, and config flows.
+
+### Fixed
+
+- Fixed selected-token manual toggle whisper targeting for character mode.
+- Prevented brittle regex indexing assumptions on unmatched spell content.
+- Improved marker-change loop protection using tracking keys.
+- Added safer marker removal behavior for represented and unlinked tokens.
+- Improved handling of missing or expired pending roll IDs.
+
+### Security
+
+- Validates API command and config input values before applying state changes.
+- Escapes dynamic chat-rendered values to reduce markup injection risk.
+
+## [0.2.0] - 2024-06-02
+
+### Changed
+
+- Updated script behavior to work with Beacon sheets.
+
+## [0.1.14]
+
+### Changed
+
+- Updated autoroll advantage behavior.
+
+### Fixed
+
+- Fixed crash when processing very high damage values.
+
+## [0.1.13]
+
+### Added
+
+- Optional autoroll with advantage.
+- Optional roll button when autoroll is disabled.
+
+## [0.1.12]
+
+### Added
+
+- `!concentration` accepts an additional spell-name argument.
+- Players can use `!concentration` for characters they control.
+
+## [0.1.11]
+
+### Changed
+
+- `!concentration` with selected tokens toggles the concentration status marker.
+
+## [0.1.10]
+
+### Fixed
+
+- When autoroll is enabled and the save fails, the concentration marker is removed automatically.
+
+## [0.1.9]
+
+### Added
+
+- Optional auto-roll saves.
+
+## [0.1.8] - 2018-05-01
+
+### Fixed
+
+- Bugfix.
+
+## [0.1.7] - 2018-04-28
+
+### Fixed
+
+- Removes status marker from all represented objects when concentration is removed.
+
+## [0.1.5] - 2018-04-25
+
+### Fixed
+
+- Correct whisper target on spell-cast concentration check.