fix(projects): strip UTF-8 BOM from 3 project.json manifests (NPE on /projects/<slug>)

[arcgod-design]

What

Strips the UTF-8 BOM (EF BB BF) prefix from three project.json manifests that currently ship on main:

• projects/fake-product-detector/project.json — added in feat(projects): add Fake Product Detector (closes #96) #108 (merge commit fc8b9d5, 2026-07-27)
• projects/medical-appointment-system/project.json — added in feat(projects): add Medical Appointment System (closes #97) #111 (merge commit 168e864, 2026-07-27)
• projects/ai-code-review/project.json — added in feat(projects): add AI Code Review Assistant (closes #102) #116 (merge commit c40fe7b, 2026-07-27)

Why

BuildVerse's src/app/api/projects/route.js wraps JSON.parse(fileContents) in try/catch and silently drops any project whose manifest fails to parse:

try {
  const meta = JSON.parse(fileContents);
  // …register project…
} catch (err) {
  continue; // skipped, no error surfaced
}

A UTF-8 BOM at byte 0 makes JSON.parse throw SyntaxError: Unexpected token \uFEFF in JSON. The three projects thus disappear from /projects AND 404 on their own /projects/<slug> routes once merged.

I verified this against upstream/main at 52cf847 directly after the merges landed:

$ git show upstream/main:projects/fake-product-detector/project.json | head -c 8 | xxd
00000000: efbb bf7b 2274 6974                        ...{"tit
                       ^^^^^ BOM

The same BOM appears at the start of all three files.

Fix

Strip the 3-byte BOM prefix. No other change to name / description / tags / author, and no change to the HTML or README in any of the three project folders.

- binary diff: -3 bytes at offset 0
+ {"title":"Fake Product Detector",…}   (parses cleanly)

Verification

Locally (PowerShell):

PS> $b = [IO.File]::ReadAllBytes("projects/fake-product-detector/project.json")
PS> $b[0..2]   # → 123 34 116 = {"t   (no BOM)
PS> $j = ([Text.Encoding]::UTF8.GetString($b) | ConvertFrom-Json)
PS> $j.title   # → "Fake Product Detector"

Same for medical-appointment-system (parses, title = "Medical Appointment System") and ai-code-review (parses, title = "AI Code Review Assistant").

Scope

Single one-line-per-file fix. No new features, no API change, no UI change.

Context

• I left review comments on PRs feat(projects): add Fake Product Detector (closes #96) #108, feat(projects): add Medical Appointment System (closes #97) #111, feat(projects): add AI Code Review Assistant (closes #102) #116 about the BOM shortly after merge — this is the standalone follow-up fix.
• PR feat(projects): add Pipe Connection Puzzle game (closes #90) #125 (issue-90 Pipe Connection Puzzle) is also getting a follow-up commit (a04513e) for an unrelated y=Math.floor SyntaxError in index.html:46 — that fix is on the existing open branch, not duplicated here.

Closes #96 (BOM follow-up).
Relates to #108, #111, #116.

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