Various bug fixes

[wallstop]

✓ Fix Systems.Immutable cascading dependency issue
✓ Fix clear-history adding itself to history
✓ Fix extraneous warnings

[Copilot]

Pull request overview

This PR updates DxCommandTerminal to support per-command opt-out from history recording, fixes default-command registration behavior when ignoreDefaultCommands is enabled, and removes the bundled System.Collections.Immutable DLL by replacing immutable sets with an internal read-only hash set wrapper.

Changes:

• Add RegisterCommandAttribute.AddToHistory / CommandInfo.addToHistory / CommandShell.AddCommand(..., addToHistory) and stop recording clear-history in history.
• Replace ImmutableHashSet<string> usages with ReadOnlyHashSet<string> and remove the bundled System.Collections.Immutable plugin assets.
• Add/expand runtime tests covering argument parsing, history behavior, keyboard controller control-order integrity checks, and ignoreDefaultCommands.

Reviewed changes

Copilot reviewed 22 out of 23 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Tests/Runtime/TryEatArgumentTests.cs (+.meta)	New tests validating CommandShell.TryEatArgument parsing and remainder behavior.
Tests/Runtime/TerminalTests.cs	Strengthens assertions and adds coverage for ignoreDefaultCommands behavior.
Tests/Runtime/TerminalKeyboardControllerTests.cs (+.meta)	New tests validating control-order integrity warnings via reflection.
Tests/Runtime/CommandShellTests.cs	Improves assertion messages (no functional behavior change).
Tests/Runtime/CommandHistoryTests.cs (+.meta)	New unit/integration tests for CommandHistory.Count, Clear(), and clear-history behavior.
Runtime/DataStructures/ReadOnlyHashSet.cs (+.meta)	Introduces ReadOnlyHashSet<T> wrapper used to replace immutables dependency.
Runtime/DataStructures/ReadOnlyHashSetExtensions.cs (+.meta)	Adds ToReadOnlyHashSet helper for snapshot creation.
Runtime/CommandTerminal/Input/TerminalKeyboardController.cs	Adjusts integrity check to warn only on missing control types (not duplicates).
Runtime/CommandTerminal/Backend/CommandShell.cs	Wires AddToHistory into command registration and (partially) into history recording.
Runtime/CommandTerminal/Backend/CommandInfo.cs	Adds addToHistory field with default true.
Runtime/CommandTerminal/Backend/CommandHistory.cs	Adds Count property delegating to the underlying buffer.
Runtime/CommandTerminal/Backend/BuiltinCommands.cs	Marks clear-history as AddToHistory = false.
Runtime/Attributes/RegisterCommandAttribute.cs	Adds AddToHistory and fixes Default propagation in the internal ctor.
Runtime/Plugins.meta / Runtime/Plugins/System.Collections.Immutable.dll.meta	Removes Unity plugin metadata for the bundled Immutable DLL.
package.json	Bumps package version to 1.0.0-rc25.0.
CHANGELOG.md	Converts to Keep a Changelog format and documents the new behavior/removals.

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Pull request overview

Copilot reviewed 22 out of 23 changed files in this pull request and generated 2 comments.

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Pull request overview

Copilot reviewed 24 out of 25 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 24 out of 25 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 25 out of 26 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

Runtime/CommandTerminal/Input/TerminalKeyboardController.cs:155

• VerifyControlOrderIntegrity now only warns when controls are missing, but it no longer warns when _controlOrder contains entries that are not in ControlTypes (e.g., TerminalControlTypes.None or any out-of-range serialized enum value). Those extra entries will be silently ignored in Update() (no _inputChecks mapping), which makes inspector misconfiguration harder to detect. Consider also detecting extraControls = _controlOrder.Except(ControlTypes) and warning (or reverting to a SetEquals-style check but with clearer messaging for both missing and extra controls).

        private void VerifyControlOrderIntegrity()
        {
            TerminalControlTypes[] missingControls = ControlTypes.Except(_controlOrder).ToArray();
            if (missingControls.Length > 0)
            {
                Debug.LogWarning(
                    $"Control Order is missing the following controls: [{string.Join(", ", missingControls)}]. "
                        + "Input for these will not be handled. Is this intentional?",
                    this
                );
            }

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