The repo's own .env contains lines like
CONFIGS_DIR= # Path to workspace-configs-templates/...
where the value is empty + an inline comment. The pre-fix parser:
1. v = " # Path to ..."
2. TrimLeft → "# Path to ..."
3. Inline-comment loop looked for " #" or "\t#" — neither matches
because the leading whitespace is gone.
4. Returned the comment text as the value.
Result: os.Setenv("CONFIGS_DIR", "# Path to ...") clobbered the auto-
discovery fallback. The TemplatesHandler then opened the comment as
a directory, ReadDir errored silently, and GET /templates returned
[]. Canvas's Templates panel showed "No templates found in
workspace-configs-templates/" even though 8 valid templates existed
on disk.
Fix: strip leading whitespace from the value FIRST, then run a
position-aware comment scan that treats `#` as a comment marker iff
it's at the start of the (trimmed) value or preceded by whitespace.
A bare `#` mid-value (e.g. `KEY=token#fragment`) still survives.
Quoted-value handling moved above the comment scan so
`KEY="value # not"` keeps the `#` as part of the value — pulled the
quote-detection into the same TrimLeft-then-check shape as the bare
path. The unterminated-quote case still falls through to bare-value
handling.
Three regression tests added covering the exact .env line that
broke (`CONFIGS_DIR= # ...`), spaces-only with comment, and tab-
only with comment.
Verified end-to-end: GET /templates now returns all 8 templates.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
4014513b94