Bump eslint-plugin-prettier 4.2.5 → 5.5.6 (blocked until #38 and #47 land)

[pinecone-groundskeeper]

Problem

package.json pins "eslint-plugin-prettier": "^4.2.1" (locked to 4.2.5). Current published major on npm is 5.5.6 — one major ahead. eslint-plugin-prettier@5.5.6's peer requirements (verified via npm view eslint-plugin-prettier@5.5.6 peerDependencies) are prettier: ">=3.0.0" and eslint-config-prettier: ">=7.0.0 <10.0.0 || >=10.1.0". This repo currently has prettier@^2.8.3 and eslint-config-prettier@^8.6.0, neither of which satisfies those ranges yet — bumping prettier is already tracked in #38 (→ ^3.9.6) and bumping eslint-config-prettier is already tracked in #47 (→ ^10.1.8), and both of those issues explicitly scope out touching eslint-plugin-prettier. This issue is the resulting follow-up once both prerequisites land.

Acceptance criteria

• Before starting, confirm Bump prettier 2.8.3 → 3.9.6 (1 major behind) #38 and Bump eslint-config-prettier 8.6.0 → 10.1.8 (2 majors behind) #47 are both merged (i.e. prettier is at ^3.x and eslint-config-prettier is at ^10.1.x or later). If either is still open, leave this issue open and do not attempt the bump yet.
• eslint-plugin-prettier devDependency in package.json is bumped to ^5.5.6, with package-lock.json updated accordingly.
• npm run lint passes with zero errors (the prettier/prettier rule wired in via .eslintrc.cjs's plugin:prettier/recommended continues to resolve and run correctly against the new plugin major).
• npm run format:check still passes.

Scope

Only the eslint-plugin-prettier version bump, gated on its prerequisites (#38, #47) already being merged. Do not re-bump prettier or eslint-config-prettier here (tracked separately), and do not change .eslintrc.cjs rules beyond whatever is strictly needed to keep plugin:prettier/recommended resolving.

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