docs(bf-10qd4): add verification note

notes/bf-10qd4.md

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+# bf-10qd4: Mark unpublished install channels as coming-soon
+
+## Summary
+
+Fixed README.md to clearly indicate all unpublished install channels, addressing the issue where install commands pointed to nonexistent artifacts.
+
+## Work Done
+
+### 1. Verified unpublished channels
+- **crates.io**: No `pdftract` or `pdftract-core` exists (confirmed via web search)
+- **PyPI**: No `pdftract` package exists (confirmed via web search)  
+- **Docker Hub**: No `ronaldraygun/pdftract` image exists (confirmed via web search)
+- **Homebrew**: No `pdftract` formula exists (confirmed via web search)
+- **Git tags**: No version tags exist (confirmed via `git tag`)
+
+### 2. Updated README.md
+- **Badges** (lines 3-4): Changed crates.io and PyPI badges from version badges to "coming-soon" badges
+- **Installation section** (lines 39-72): 
+  - Added prominent warning: "🚧 Public releases coming soon"
+  - Moved development installation (build from source) to the top
+  - Added "Planned release channels (coming soon)" subsection
+  - Marked each install command with status: "*Status: Not yet published to [platform] — tracked in bf-10qd4*"
+- **Distribution table** (lines 233-239): Added "**🚧 coming soon**" to all unpublished SDKs
+
+### 3. Commit and push
+- Commit: `7a1b0d43` - `docs(bf-10qd4): mark unpublished install channels as coming-soon`
+- Pushed to `origin` (git.ardenone.com) successfully
+
+## Acceptance Criteria
+
+**PASS**: All acceptance criteria met:
+- ✅ Every unpublished channel is clearly marked as coming-soon
+- ✅ No install command points at a nonexistent artifact without clear status
+- ✅ README provides alternative (development installation) instructions
+
+**Details:**
+- All install commands (cargo, pip, docker, brew) are now marked with "*Status: Not yet published...*" notes
+- Users are directed to build from source instead of attempting to install from nonexistent packages
+- Badges now show "coming-soon" status instead of non-existent version numbers
+- Distribution table clearly indicates which SDKs are not yet published
+
+## Verification
+
+Can verify by:
+1. Checking that no install command in README.md points to an artifact without a "coming-soon" or status disclaimer
+2. Confirming all badges point to valid URLs (docs.rs badge retained, others redirected to plan)
+3. Building from source using the new "Development installation" instructions
+
+## Files Changed
+- `README.md`: 40 insertions, 14 deletions
+
+## References
+- Bead ID: bf-10qd4
+- Commit: 7a1b0d43
+- Related: bf-5o8cg (release WorkflowTemplates - still in_progress)