Add transcript line workflow rules

openspec/changes/archive/2026-06-03-add-transcript-write-workflow-rules/proposal.md

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+# Change: Add transcript write workflow rules
+
+## Why
+Azure Speech can emit masked profanity as `*****`. In markdown transcript files, that token can be interpreted as formatting instead of normal transcript text, which makes the generated transcript harder to read and summarize.
+
+## What Changes
+- Add a workflow trigger for transcript line writes.
+- Expose the formatted transcript line and speaker name to workflow conditions and Razor step templates.
+- Allow workflow rules to set the transcript line before it is appended or rewritten.
+- Add a default local rule that replaces `*****` with `[redacted]`.
+
+## Impact
+- Extends the meeting workflow engine event model.
+- Routes live transcript appends and finished transcript rewrites through the workflow engine before writing lines.
+- Updates workflow documentation and rule validation.