feat: standardise recheck availability to JSONL output

- extract_recheck() now writes availability_{date}_recheck_{HH}.jsonl.gz
  (one venue per line with date/captured_at_utc/recheck_hour injected);
  uses compress_jsonl_atomic; removes write_gzip_atomic import
- stg_playtomic_availability: add recheck_jsonl CTE (newline_delimited
  read_json on *.jsonl.gz recheck files); include in all_venues UNION ALL;
  old recheck_blob CTE kept for transition
- init_landing_seeds.py: add JSONL recheck seed alongside blob seed
- Docs: README landing structure + data sources table updated; CHANGELOG
  availability bullets updated; data-sources-inventory paths corrected

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

transform/sqlmesh_padelnomics/models/staging/stg_playtomic_availability.sql

@@ -5,7 +5,8 @@
 -- Reads BOTH morning snapshots and recheck files:
 --   Morning (new):  availability_{date}.jsonl.gz           → snapshot_type = 'morning'
 --   Morning (old):  availability_{date}.json.gz            → snapshot_type = 'morning'
---   Recheck:        availability_{date}_recheck_{HH}.json.gz → snapshot_type = 'recheck'
+--   Recheck (new):  availability_{date}_recheck_{HH}.jsonl.gz → snapshot_type = 'recheck'
+--   Recheck (old):  availability_{date}_recheck_{HH}.json.gz  → snapshot_type = 'recheck'
 --
 -- Only 60-min duration slots are kept (canonical hourly rate + occupancy unit).
 -- Price parsed from strings like "14.56 EUR" or "48 GBP".
@@ -77,7 +78,30 @@ morning_blob AS (
   ) af,
   LATERAL UNNEST(af.venues) AS t(venue_json)
 ),
--- Recheck snapshots (blob format only — small files, no JSONL conversion needed)
+-- Recheck snapshots (new JSONL format — one venue per line)
+recheck_jsonl AS (
+  SELECT
+    date                             AS snapshot_date,
+    captured_at_utc,
+    'recheck'                        AS snapshot_type,
+    TRY_CAST(recheck_hour AS INTEGER) AS recheck_hour,
+    tenant_id,
+    slots                            AS slots_json
+  FROM read_json(
+    @LANDING_DIR || '/playtomic/*/*/availability_*_recheck_*.jsonl.gz',
+    format = 'newline_delimited',
+    columns = {
+      date: 'VARCHAR',
+      captured_at_utc: 'VARCHAR',
+      recheck_hour: 'VARCHAR',
+      tenant_id: 'VARCHAR',
+      slots: 'JSON'
+    },
+    filename = true
+  )
+  WHERE tenant_id IS NOT NULL
+),
+-- Recheck snapshots (old blob format, kept for transition)
 recheck_blob AS (
   SELECT
     rf.date                          AS snapshot_date,
@@ -111,6 +135,8 @@ all_venues AS (
   UNION ALL
   SELECT * FROM morning_blob
   UNION ALL
+  SELECT * FROM recheck_jsonl
+  UNION ALL
   SELECT * FROM recheck_blob
 ),
 raw_resources AS (