Allow optional tmpDir and logDir in Meta constructor

[koriym]

Summary

• Add optional $tmpDir / $logDir constructor arguments to Meta (BC: existing 3-arg calls unchanged).
• Default remains {appDir}/var/tmp/{context} and {appDir}/var/log/{context}.
• Centralize mkdir / writability checks in ensureDir().
• Environment reading is intentionally not done in Meta; applications resolve paths and pass them in.

Usage

// defaults
new Meta('MyVendor\Project', 'prod-app', $appDir);

// overrides (resolved paths only)
new Meta('MyVendor\Project', 'prod-app', $appDir, '/var/tmp/my-app', '/var/log/my-app');

Motivation

Writable directories are deploy-dependent. Package compile can share the same Meta via the application injector (Compiler::fromInjector). Meta should accept explicit paths without taking on env/bootstrap policy.

Test plan

• composer tests (cs / sa / phpunit)
• Default tmp/log paths still created under var/
• Custom tmpDir/logDir are used and created
• CI green on PHP 8.1+

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• Create PR with unit tests
• Commit unit tests in branch feature/meta-optional-tmp-log-dir

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (82e687a) to head (7ef524c).

Additional details and impacted files

@@             Coverage Diff             @@
##                 1.x       #41   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
+ Complexity        19        17    -2     
===========================================
  Files              3         3           
  Lines             45        48    +3     
===========================================
+ Hits              45        48    +3     

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