Remove Instructions/Feedback + lp_profiles; sync retry, purge, mobile fixes (v0.1.0:104)

Removals (net -570 lines):
- Delete the Instructions and Feedback (feature_requests) pages + backend.
- Retire lp_profiles + investor_type across server, ingest, and seeds; migration
  0008 drops both empty tables (a sanctioned one-off exception to
  never-hard-delete). 0001's lp_profiles ALTER is removed so a fresh DB doesn't
  break the migration chain (live DBs already applied it).

Fixes:
- Email sync: a transient timeout no longer terminally parks a mailbox; the
  scheduler retries 'retrying' each cycle and re-includes errored accounts on an
  hourly backoff, so stuck mailboxes self-heal.
- Mobile Contacts: page through the full directory (server caps 500/page) -- one
  fetch silently truncated at 720, hiding people from the list and from search.
- Mobile email review: clock icon to set a reminder inline; approval cards show
  date/time.

New:
- Admin-only purge of soft-deleted rows (Settings -> Admin; type-to-confirm,
  refuses any row still linked to live data).

Tests: 45/45 (adds test_sync_ready + test_purge_soft_deleted). Reviewer pass
applied (NULL reminders.contact_id on contact purge). Bumped to v0.1.0:104.

backend/ingest/test_entity_resolution.py

@@ -12,7 +12,7 @@ Asserts the SAFE fix:
   3. a grid contact that can't be PROVABLY matched mints NOTHING (no duplicate
      person, no cross-firm name guess) — the count stays correct,
   4. targeted cleanup soft-deletes a stale grid-only "twin" (person with no
-     contacts link) and a superseded 'lp'/'organization' row, with no enrichment,
+     contacts link), with no enrichment,
   5. cleanup PRESERVES a grid-only person that carries enrichment (guardrail #3),
   6. a re-emitted id is UN-tombstoned (no permanent burial),
   7. re-running is idempotent.
@@ -58,10 +58,9 @@ CREATE TABLE contacts (
 CREATE TABLE organizations (id TEXT PRIMARY KEY, name TEXT, email TEXT);
 CREATE TABLE fundraising_investors (id TEXT PRIMARY KEY, investor_name TEXT);
 CREATE TABLE fundraising_contacts (id TEXT PRIMARY KEY, full_name TEXT, email TEXT, investor_id TEXT, contact_id TEXT);
-CREATE TABLE lp_profiles (id TEXT PRIMARY KEY, contact_id TEXT, deleted_at TEXT);
 """
 
-SEEDED = ("per_TWIN", "per_ENR", "lp_OLD")
+SEEDED = ("per_TWIN", "per_ENR")
 
 
 def seed(db):
@@ -94,16 +93,14 @@ def seed(db):
               "('per_ENR','person','Enriched Orphan','entity_resolution','warm')")
     c.execute("INSERT INTO entity_links (id, canonical_id, source_model, source_id, match_value, match_kind, confidence, created_at) "
               "VALUES ('l_enr','per_ENR','fundraising_contacts','gy','enr','name_org',0.8,'t')")
-    # Superseded pre-:48 kind -> prune
-    c.execute("INSERT INTO canonical_entities (id, entity_kind, display_name, source) VALUES "
-              "('lp_OLD','lp','Old LP Row','entity_resolution')")
     c.commit()
     c.close()
 
 
 def resolved_persons(db):
     c = sqlite3.connect(db)
-    q = "SELECT COUNT(*) FROM canonical_entities WHERE entity_kind='person' AND deleted_at IS NULL AND id NOT IN (?,?,?)"
+    ph = ",".join("?" * len(SEEDED))
+    q = f"SELECT COUNT(*) FROM canonical_entities WHERE entity_kind='person' AND deleted_at IS NULL AND id NOT IN ({ph})"
     n = c.execute(q, SEEDED).fetchone()[0]
     c.close()
     return n
@@ -127,10 +124,11 @@ def grid_match_kinds(db):
 def minted_from_grid(db):
     """Persons minted directly from a grid row (the bug). Should be 0 after the fix."""
     c = sqlite3.connect(db)
-    n = c.execute("""SELECT COUNT(DISTINCT l.canonical_id) FROM entity_links l
+    ph = ",".join("?" * len(SEEDED))
+    n = c.execute(f"""SELECT COUNT(DISTINCT l.canonical_id) FROM entity_links l
                        JOIN canonical_entities ce ON ce.id=l.canonical_id AND ce.deleted_at IS NULL
                       WHERE l.source_model='fundraising_contacts' AND l.match_kind IN ('name_org','exact_email')
-                        AND l.canonical_id NOT IN (?,?,?)""", SEEDED).fetchone()[0]
+                        AND l.canonical_id NOT IN ({ph})""", SEEDED).fetchone()[0]
     c.close()
     return n
 
@@ -162,12 +160,11 @@ def main():
     check(mk.get("grid_assoc", 0) == 2, f"two grid contacts matched back via grid_assoc (got {mk.get('grid_assoc',0)})")
     check(mk.get("grid_link", 0) == 1, f"one grid contact linked via explicit contact_id (grid_link==1, got {mk.get('grid_link',0)})")
 
-    # Targeted cleanup: stale grid-only twin + superseded 'lp' row tombstoned...
+    # Targeted cleanup: stale grid-only twin tombstoned...
     check(deleted_at(db, "per_TWIN") is not None, "stale grid-only twin 'per_TWIN' tombstoned")
-    check(deleted_at(db, "lp_OLD") is not None, "superseded 'lp' row 'lp_OLD' tombstoned")
     # ...enriched grid-only person preserved.
     check(deleted_at(db, "per_ENR") is None, "enriched grid-only person 'per_ENR' PRESERVED (has segment)")
-    check(counts1.get("pruned_stale", 0) == 2, f"exactly 2 stale rows pruned (got {counts1.get('pruned_stale')})")
+    check(counts1.get("pruned_stale", 0) == 1, f"exactly 1 stale row pruned (got {counts1.get('pruned_stale')})")
 
     # Un-tombstone: soft-delete a real contact-person, then re-run -> it comes back.
     alice = er._eid("per", "e|alice@x.com")