[PurHur]

Summary

• Add ext/fileinfo module: FILEINFO_* constants, finfo class, and finfo_open / finfo_file / finfo_buffer / finfo_close / finfo_set_flags
• PHP-in-PHP MIME sniff via VmFinfo + existing VmMime::detectFromBytes() (no new C runtime); JIT deferred (VM-only v1)
• Wire Runtime load, spine requires, capability matrix, bootstrap inventory

php-src ref: ext/fileinfo/fileinfo.c, fileinfo.stub.php

Closes #3366

Test plan

• ./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/maintainer_gap_finfo_mime.php'
• ./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter finfo_mime test/compliance/VMTest.php'
• ./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./script/check-generated-docs.sh'
• php script/check-selfhost-spine-coverage-sync.php + php script/bootstrap-inventory.php --check

Verification transcript

$ php bin/vm.php test/repro/maintainer_gap_finfo_mime.php
text/x-php
text/x-php
bad_false
text/plain; charset=us-ascii
text/x-php
text/x-php
ok

$ vendor/bin/phpunit --filter finfo_mime test/compliance/VMTest.php
OK (1 test, 1 assertion)

$ ./script/check-generated-docs.sh
check-generated-docs: all generated docs in sync.

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