fix: restore multi-JDK features lost in aesh migration

[maxandersen]

Problem

PR #2271 (feat: install multiple JDKs with same major version) was merged on May 14, but several of its features were lost when PR #2453 (aesh migration) was squash-merged on June 3. The aesh migration rewrote Jdk.java from picocli to aesh annotations but didn't preserve all the behavioral changes from #2271.

What was lost and is now restored

Jdk.java — 7 fixes

Feature	What happened
jdk list --providers/-P	Entire option + handler deleted
jdk list --distros/-D	Entire option + handler deleted, JdkDistroQuery import dropped
Full version comparison (defVersion string)	Reverted to defMajorVersion int — breaks default marker with multiple JDKs of same major version
Separate available/installed mapping	Collapsed to single path; linkedId always null, no LinkedJdk detection
Tag display in list output	Dropped from text output
jdk uninstall two-pass (canInstall → canUpdate)	Replaced with single canUpdate; info message uses raw input instead of jdk.id()
jdk java-env uses canInstall	Reverted to canUpdate

TestJdk.java — 4 restored tests

Test	What it covers
testJdkInstallWithLinkingAndIntegerId	Integer ID rejection when linking
testJdkInstallWithLinkingToExistingJBangJdkPath	JBang-managed path rejection
testJdkInstallSameVersion	"Already installed" message
testJdkInstallSameVersionForced	--force creates versioned dir + symlink (core multi-JDK feature)

Verification

All 30 TestJdk tests pass (including the 4 restored ones), plus TestRun (124) and TestProject (9) — zero failures.

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[maxandersen]

@quintesse this is result after asking opus to investigate what features/fixes from #2271 got lost in aesh port.

does it look right or I can also go back rebasing ash pr but that would be much bigger diff I fear.

[quintesse]

I already wnet through it by hand but I'll check it against this to see if either of us missed anything

[maxandersen]

related to #2515

[maxandersen]

on my own quick look and LLM deeper look #2515 does the same but more so closing this.

#2515 covers everything plus additional fixes (the JdkProvidersMixin visibility change, linkedId display, and more thorough test infrastructure updates that make mock JDKs match the real directory layout).