fix(opencode): memory leaks in session handling

[ztripez]

Fixes #5363

What does this PR do?

Fixes memory leaks in session handling that cause unbounded memory growth during long conversations.

Key fixes:

1. Provider caches - Replace unbounded Maps with LRU eviction (100/50 entry limits) to prevent SDK object accumulation
2. Prompt loop clone - Remove unnecessary deep clone of entire message history on every turn, use selective shallow copying instead
3. Session cleanup - Add cleanup for FileTime and ACP session state when sessions end
4. Bus subscriptions - Convert permanent subscriptions to use Instance.state() disposal pattern to prevent listener leaks
5. Compaction output deletion - Actually delete tool output text from storage instead of just marking it compacted (critical fix - output was staying in JSON files)
6. Pending request timeouts - Add 5-minute timeout to permission/question requests to prevent hanging promises in abandoned sessions
7. Processor map cleanup - Clear toolcalls map when handling aborted tools to prevent accumulation
8. String concatenation - Use array accumulation + join instead of += for streaming text/reasoning/bash output to avoid creating intermediate string objects

How did you verify your code works?

• Passes existing typecheck
• Changes follow existing patterns in codebase (Instance.state disposal, LRU pattern already used elsewhere)
• Most critical fix (5 compaction) is straightforward - replaces output string with placeholder before saving instead of after
• Timeout pattern (6) matches existing timeout implementations in other tools
• String accumulation (8) is standard optimization, uses join() only when needed for updates

Testing recommendations:

• Long sessions with many tool calls to verify compaction reduces storage size
• Monitor memory usage over time with session lifecycle
• Verify abandoned sessions clean up pending requests after 5 minutes

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Related PRs Found

Here are PRs that may be related to or duplicate aspects of PR #10392:

1. feat(util): Add bounded LRU cache utility #9141 - feat(util): Add bounded LRU cache utility

   • Related to the LRU cache implementation mentioned in fix feat: compact and other improvements #1 (provider caches)

2. fix(memory): Fix timeout, interval, and subscription cleanup #9148 - fix(memory): Fix timeout, interval, and subscription cleanup

   • Directly related to subscription cleanup and timeout patterns (fixes [readme] [bug] cant install #6 and feat: add configuration persistence for model selections #4 in this PR)

3. fix(disposal): Complete Instance disposal chain for plugins and caches #9149 - fix(disposal): Complete Instance disposal chain for plugins and caches

   • Related to the Instance.state() disposal pattern mentioned throughout this PR

4. fix: clean up pending permissions when session is deleted #7154 - fix: clean up pending permissions when session is deleted

   • Related to session cleanup when sessions end (fix feat: model config persistence #3 and [readme] [bug] cant install #6)

5. fix(core): add dispose functions to prevent subscription memory leaks #7032 - fix(core): add dispose functions to prevent subscription memory leaks

   • Related to subscription leak prevention and disposal pattern

6. fix(memory): Fix event listener leaks in TUI and Slack bot #9147 - fix(memory): Fix event listener leaks in TUI and Slack bot

   • Related to listener leak prevention (fix feat: add configuration persistence for model selections #4)

These PRs may contain overlapping solutions or address the same underlying issues. You may want to review them to ensure no duplicate effort or check if this PR should incorporate/reference those fixes.

[Thejuampi]

tested this but no luck for me , that is after a few hours on a java project with jdtls LSP