Cover the loader shapes the reverted autoloader attempts broke

[SanderMuller]

Test-only. No behaviour change - src/ is untouched.

#6292 reverted five commits because, as you put it, every intervention in this area fixes one use case and breaks another. The problem for a future attempt is that only some of those breakages had an e2e project, so the next person gets no signal until a user reports it. These two projects pin the shapes that actually broke, using the real loaders rather than hand-rolled stand-ins.

project	2.2.9 (#6069 + #6185)	598faaade (#6287 series)	this commit
class-alias-loader	1 error	No errors	No errors
robot-loader	No errors	Internal error	No errors

Between them they cover both eras of breakage, and neither duplicates an existing project.

class-alias-loader uses the real typo3/class-alias-loader with always-add-alias-loader: it takes Composer's loader out of the queue and puts its own wrapper in, resolves a legacy name through a class alias map, and an IDE-only stub inside the analysed paths declares that same name as a plain class without the method. The alias has to win. On 2.2.9 the stub wins and PHPStan reports a missing method - the TYPO3 shape from phpstan/phpstan#15102, now with the actual package instead of my synthetic wrapper in bug-15102.

robot-loader registers a Nette RobotLoader over a directory Composer does not map, so only that loader can resolve the class (verified: without the bootstrap the project reports 2 errors, and the class has no Composer classmap entry). RobotLoader locks and writes a cache file while resolving, and on 598faaade that fails:

Internal error: Unable to create file '<tmp>/phpstan-e2e-robot-loader/<hash>.php.lock'
  Nette\Loaders\RobotLoader->acquireLock()
  Nette\Loaders\RobotLoader->tryLoad()

because the loader runs while the file-read trap has replaced the file stream wrapper. That is a shape none of the existing projects covered - an autoloader that writes during resolution - and it is the one I would have wanted before touching this code at all. It reproduces 3/3 runs, cold or warm cache, and with or without the explicit setTempDirectory().

Notes

• Both are green here, so CI stays green; they only turn red if the shapes regress again.
• bug-14988 and bug-12972b stay commented out as you left them - they document Cannot redeclare function: AutoloadFunctionsSourceLocator includes PSR-4 function files untrapped phpstan#14988 and PHPStan autoloader mechanics invoked for case which does not use autoloading at runtime phpstan#14976, which are open.
• Nothing here attempts a fix. If someone retries, the gate is: turn those two green without turning these two, bug-12972c, bug-15102, bug-15102b or bug-15102c red.

[ondrejmirtes]

Thank you!