perf(ui,services): remove render-time filesystem probes from the GPUI thread

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code

[Tryanks]

Render paths performed per-row filesystem I/O: relativize_to_workspace canonicalized the workspace root on every call (changed-file rows, diff view, markdown view), and markdown link resolution probed path.exists() per candidate.

Both are now cached rather than offloaded:

• Workspace root: a process-wide 8-entry LRU maps cwd → canonicalized root, with poison-recovering lock. One probe per distinct cwd instead of one per rendered row.
• Markdown link targets: a document-scoped cache on MarkdownState, cleared on content reparse and base-dir change. One exists() probe per unique URL per document version.

Accepted (bounded) staleness: filesystem-only changes (e.g. a linked file appearing/disappearing without document changes, or a workspace symlink retargeting) can serve a stale resolution until the next invalidation/eviction — per the direction in the issue.

Tests: a symlink-based regression test proving root reuse after the link is removed, and a cache-invalidation test covering content and base-dir changes.

Gates run locally: cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo test --workspace --locked — all green.

Closes#154

🤖 Generated with Claude Code