refactor(cli): implement canonical path resolution in TUI and worker commands

[OpeOginni]

Issue for this PR

Closes #

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Fix inconsistent instance identity for case-variant paths
This fixes a regression where opencode ../dir could open TUI but streaming/UI state became inconsistent (for example, session updates/deletes not reflecting immediately).
Root cause: Instance cache keys used raw directory strings. On macOS case-insensitive filesystems, the same directory can appear with different casing (for example .../PERSONAL/... vs .../Personal/...) depending on caller/source (PWD, cwd, request headers). Those strings are not equal, so OpenCode created multiple logical instances for one physical directory.
What changed

• Added Filesystem.canonical() in packages/opencode/src/util/filesystem.ts to normalize directory identity.
• Updated Instance.provide() in packages/opencode/src/project/instance.ts to canonicalize input.directory before:
  • cache lookup,
  • cache insert,
  • project resolution/context creation.

How did you verify your code works?

Tested using bun run dev ../another-dir when inside a folder with an all caps name e.g /TEST

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

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

Potential Duplicate Found

PR #15483: fix: symlink path resolution causing duplicate instances (#15482)

• fix: symlink path resolution causing duplicate instances (#15482) #15483

Why it's related: This PR also addresses duplicate instance creation caused by path resolution issues. It specifically deals with symlink path resolution creating duplicate instances, which is conceptually similar to PR #16023's fix for path-casing creating duplicate instances on case-insensitive filesystems. Both are addressing the root cause of multiple logical instances being created for the same physical directory.