scaffold PKB directories, templates, and Obsidian Bases

Establishes the knowledge-base substrate the Council now sits on top of:
daily/, inbox/ (+ raw/ for AudioPen drops), notes/, projects/,
reading/, reflections/, reviews/, _templates/. Each folder seeded with
a .gitkeep so the structure is committed even when empty.

Six templates under _templates/ define the canonical shape for each
note type (daily, permanent, project, reading, reflection, fleeting).
Frontmatter includes the type: field so the Bases below can filter on
it without collision with the existing council-* vocabulary.

Five new Obsidian Bases at repo root: notes.base, projects.base (with
active / all views), reading.base (to-read / reading / done views),
reflections.base (combined reflections + weekly + monthly reviews),
and inbox.base (fleeting notes awaiting triage).

Expanded .obsidian/app.json userIgnoreFilters to hide _templates and
scripts from the vault index so they don't clutter the graph, search,
or file explorer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

_templates/project-note.md

@@ -0,0 +1,26 @@
+---
+type: project
+title:
+status: active
+started: {{date}}
+tags: []
+---
+
+# {{title}}
+
+## Why
+
+<!-- What is this project for? What outcome defines done? -->
+
+
+## Outcome definition
+
+
+## Constraints
+
+<!-- Time, money, scope, others' involvement, anything binding. -->
+
+
+## Log
+
+See [[log]].