Add approveAll and reviewUnapproved tasks/goals to Gradle and Maven plugins

[Copilot]

Adds two new build tool tasks/goals for dealing with unapproved files — those that have a -received.* file alongside their inventory-tracked approved file.

Core: ApprovedFileInventory

New inventory-based helpers (no filesystem walk):

• findReceivedFiles() — for each approved path in the inventory, derives the corresponding received path and returns those that exist on disk
• approveAll() — moves each such received file onto its approved counterpart (REPLACE_EXISTING)
• reviewUnapproved(FileReviewer) — applies the configured reviewer to each unapproved pair; --review-unapproved CLI command uses Configuration.configuration.defaultFileReviewer()

Received path is derived from the approved path via receivedPathFor(approvedPath) — uses lastIndexOf("-approved.") to target only the last occurrence and an explicit endsWith("-approved") guard for extension-less files.

Gradle plugin

Two new JavaExec tasks in the verification group:

Task	CLI arg
approvejApproveAll	--approve-all
approvejReviewUnapproved	--review-unapproved

Maven plugin

Two new mojos mirroring the Gradle tasks:

Goal	CLI arg
approve-all	--approve-all
review-unapproved	--review-unapproved

The reviewer used by review-unapproved is sourced from defaultFileReviewerScript / defaultFileReviewer in approvej.properties; defaults to none if unconfigured.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add task/goal to review unapproved files across the project</issue_title>
<issue_description>Now that ApproveJ has build tool plugins, we can add new interesting tasks.

Let's add a task/goal reviewUnapproved to the two plugins to trigger a review on all the unapproved files in the project.
This should be rather easy using the existing inventory and checking if there's a corresponding received file next to it.

Also we can add an approveAll task to automatically approve all remaining unapproved files.</issue_description>

<agent_instructions>Please first provide a plan how to implement this issue.
There is some general information in the CLAUDE.md file, you might find useful.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Add task/goal to review unapproved files across the project #198

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