feat: add trashed notes to demo vault

Added 3 trashed notes with trashed_at dates in frontmatter:
- note-old-meeting-notes.md (trashed 2026-02-10)
- note-deprecated-workflow.md (trashed 2026-01-15)
- experiment-failed-podcast.md (trashed 2026-02-05)

These provide realistic test data for the trash feature in the demo vault.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

demo-vault-v2/experiment/experiment-failed-podcast.md

@@ -0,0 +1,21 @@
+---
+Is A: Experiment
+Status: Dropped
+trashed: true
+trashed_at: "2026-02-05"
+---
+# Failed Podcast Experiment
+
+Tried launching a weekly podcast alongside the newsletter. The production overhead was too high for the audience growth it generated.
+
+## Hypothesis
+A companion podcast would increase newsletter subscribers by 30% within 3 months.
+
+## Results
+- Produced 8 episodes over 2 months
+- Gained only ~200 new subscribers (vs 2000 target)
+- Each episode took 4-6 hours to produce
+- ROI was negative compared to writing time
+
+## Decision
+Dropped the podcast and reallocated time back to writing. The newsletter remains the primary channel.

demo-vault-v2/note/note-deprecated-workflow.md

@@ -0,0 +1,18 @@
+---
+Is A: Note
+trashed: true
+trashed_at: "2026-01-15"
+Topics: ["[[topic-productivity-systems]]"]
+---
+# Deprecated Workflow
+
+An old workflow for managing sponsorship outreach that was replaced by the new CRM-based process. Keeping in trash in case any of the templates are useful later.
+
+## Old Process
+1. Find potential sponsors via LinkedIn
+2. Send cold email using template A
+3. Follow up after 3 days
+4. Schedule call if interested
+
+## Why Deprecated
+The manual process was too slow and error-prone. Switched to automated pipeline with CRM integration.

demo-vault-v2/note/note-old-meeting-notes.md

@@ -0,0 +1,18 @@
+---
+Is A: Note
+trashed: true
+trashed_at: "2026-02-10"
+Topics: ["[[topic-productivity-systems]]"]
+---
+# Old Meeting Notes
+
+These are meeting notes from a brainstorming session that didn't lead anywhere. The project was shelved and these notes are no longer relevant.
+
+## Attendees
+- Luca
+- Matteo
+
+## Discussion
+- Explored potential partnership with a media company
+- Decided not to pursue after evaluating the terms
+- Follow-up was scheduled but never happened