Docs: GETTING-STARTED optional step — 006-FileUploadWeb multipart upload demo

[PurHur]

Problem

docs/GETTING-STARTED.md has an optional 005-SessionsWeb presenter step (#1958 ✅) but no parallel for 006-FileUploadWeb. The example is on master (#1999 ✅) with VM multipart smoke default-on (#2009 ✅) and AOT execute (#2012 ✅), yet first-time presenters still miss the curl -F upload story when demoing file handling without Zend PHP.

Goal

Add an optional numbered step (after §5 SessionsWeb, before self-host) mirroring examples/006-FileUploadWeb/README.md:

./phpc serve examples/006-FileUploadWeb
curl -s -F 'doc=@examples/006-FileUploadWeb/README.md' http://127.0.0.1:8080/example.php

Mention AOT/deploy as “when LLVM green” links only (#2012, #2028, #2038) — do not block the VM presenter path.

Scope

Piece	Path
Guide	docs/GETTING-STARTED.md — new subsection + talking point
Cross-link	examples/README.md § 006, #2010 phpc doctor --gates
Status site	Optional one-liner in docs/pages/development-status.md (#2039 bundle)

Out of scope: deploy-smoke.sh (#2028); phpc init --profile fileupload (#2004 ✅).

Acceptance criteria

• GETTING-STARTED lists VM multipart demo commands copy-paste ready
• Links Examples: 006-FileUploadWeb — multipart $_FILES reference + AOT execute smoke #1999, CI: Default FILE_UPLOAD_WEB_SMOKE_GATE=1 in ci-local after #2008 green #2009, CI: Default FILE_UPLOAD_WEB_AOT_SMOKE_GATE=1 in ci-local after #2011 green #2012, Testing: deploy-smoke multipart upload for 006-FileUploadWeb #2028, ROADMAP 🗺️ ROADMAP: Self-host + web-capable PHP subset (living) #78
• grep -q '006-FileUploadWeb' docs/GETTING-STARTED.md

Verification (local / Docker only)

make examples-web-smoke
# or:
FILE_UPLOAD_WEB_SMOKE_GATE=1 ./script/examples-web-smoke.sh
docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  make examples-web-smoke

No GitHub Actions (#394 ✅).

Dependencies

• Examples: 006-FileUploadWeb — multipart $_FILES reference + AOT execute smoke #1999 ✅ example tree
• CI: Default FILE_UPLOAD_WEB_SMOKE_GATE=1 in ci-local after #2008 green #2009 ✅ VM smoke gate

Links

• ROADMAP 🗺️ ROADMAP: Self-host + web-capable PHP subset (living) #78 Phase 4 Polish
• Closed precedent: Docs: GETTING-STARTED optional step — 005-SessionsWeb session flash demo #1958 (005 presenter)