Implement PsrAutoloading in blink

[TomasVotruba]

Ports PHP-CS-Fixer's PsrAutoloadingFixer to blink, the only ECS rule previously unported. It was blocked because blink fixers receive just a token stream, while this rule needs the file path to derive the expected class name.

Threading the path

• tokens.Stream gains a path field with SetPath/Path.
• The runner sets it per file in fixFile, so the Fixer interface stays unchanged and no other rule is affected.

The fixer

PsrAutoloading renames the single class/interface/trait/enum in a file so its name matches the file basename, and with the dir option corrects namespace casing to the path. It mirrors the upstream logic: skips non-php files, invalid-identifier basenames and stub/fixture paths, bails on more than one namespace or named classy declaration, and ignores anonymous classes and ::class constants.

Set membership

It is opt-in only, matching ECS: not part of psr12/common/default, and explicitly excluded from the per-cs set (which otherwise runs every fixer), so parity corpora are unaffected. It resolves by name for --ecs-config.

Tests and counts

• Unit tests cover rename, interface/trait/enum, no-op, skip conditions, the ::class and anonymous-class cases, and the dir namespace-casing branch.
• bin/rule-counts.sh now reports 0 missing rules (blink 210).
• ecs-rules.txt updated; its stale "NOT YET IMPLEMENTED" list (every entry was already implemented) is cleared.