fix(release): use explicit npm version updater

[jmagar]

Problem

The post-merge release-please workflow for commit 20868234 failed with:

release-please failed: value at path package.version is not tagged

release-please-config.json used an implicit bare extra-file entry for packages/cortex-rmcp/package.json, while binaryVersion already used an explicit JSON updater. The implicit updater no longer resolves the scoped npm package version correctly.

Fix

• replace the bare package.json extra-file entry with an explicit JSON updater for $.version
• retain the explicit updater for $.binaryVersion
• add a structural workflow contract requiring both JSON paths and forbidding the implicit updater

Verification

• configuration remains valid JSON
• workflow contract parses the configuration structurally
• PR CI will exercise formatting, tests, Clippy, and repository contracts
• after merge, the decisive verification is a green release-please workflow on main

[Copilot]

Pull request overview

Fixes a release-please post-merge failure by switching the packages/cortex-rmcp/package.json entry from an implicit extra-file updater to an explicit JSON updater for $.version, aligning it with the already-explicit $.binaryVersion updater and adding a test contract to prevent regressions.

Changes:

• Replace the bare packages/cortex-rmcp/package.json extra-files entry with an explicit { type: "json", jsonpath: "$.version" } updater.
• Add a structural test contract that requires explicit JSON updaters for both $.version and $.binaryVersion, and forbids the implicit string-style updater.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/workflow_shapes.rs	Adds a structural assertion that release-please-config.json contains explicit JSON updaters for packages/cortex-rmcp/package.json ($.version and $.binaryVersion) and forbids the implicit string entry.
release-please-config.json	Updates extra-files to use an explicit JSON updater for $.version instead of the implicit extra-file entry for the npm package.json.

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