plannotator annotate misleading "File not found" for unsupported file types (e.g. .cs)

[NikiforovAll]

plannotator annotate <file> returns File not found: <path> when given a non-markdown file that exists on disk. The path resolves correctly — the failure is actually a file-type filter.

Repro (Windows, Git Bash, Plannotator 0.19.17):

$ plannotator annotate notes/design.md
Resolved: C:\...\notes\design.md           # works

$ plannotator annotate lib/util.cs
File not found: lib/util.cs                # file exists

$ plannotator annotate C:\repo\lib\util.cs
File not found: ...                         # absolute path, still fails

Two requests:

1. Fix the error message — say "File type not supported (only .md/plan files accepted)" instead of "File not found". Current message wastes time debugging path/Windows/Git Bash issues that aren't there.

2. Feature request — annotate source code files. Many workflows benefit from inline annotation of code (e.g. .cs, .ts, .py) the same way as plans/specs. /plannotator-review exists for code review, but it's a different UX (diff review vs. inline line-by-line annotation). Having annotate accept any text file would unify the experience.

Environment:

• OS: Windows 11
• Shell: Git Bash (MSYS2)
• Plannotator: 0.19.17

[backnotprop]

Feature request — annotate source code files. Many workflows benefit from inline annotation of code (e.g. .cs, .ts, .py) the same way as plans/specs. /plannotator-review exists for code review, but it's a different UX (diff review vs. inline line-by-line annotation). Having annotate accept any text file would unify the experience.

Okay, sounds good. Shouldn't be that much of a problem since you can annotate code files now in any of the plans or annotates.

[NikiforovAll]

thanks, appreciate your work, you are legend man