Release prep v0.0.12: README rewrite, fix binary size everywhere

Sourav: 'the entire readme sounds like written by an AI not a human.
Keep Duckie as a marketing tool though.'

Done:
- Hero rewritten as first-person ("I built Duckle because I wanted
  Talend's connector depth without Talend's JVM dance"). Keeps the
  Duckie marketing punch, drops the templated 'Three things make X
  different' construction.
- 'What Duckle does' replaced with 'How a pipeline actually runs' -
  walks through what each node type compiles to in real SQL with
  specific table-naming + topological-sort behavior, then lists the
  six things that bypass SQL.
- 'Why Duckle is different' table (puffery: 'Visual never opaque',
  'Local-first AI', 'Honest about scope') replaced with 'Why these
  choices' prose. Six concrete decisions explained as paragraphs
  with the actual cost/trade-off each one pays. Sounds like a
  developer at the keyboard, not a marketing one-pager.
- 'Meet Duckie' rewritten without the templated 4-cell feature
  table. Keeps the sell ('runs on your CPU', 'no API key', 'click
  Insert and it appears on the canvas') but in flowing prose.
- 'Status, honestly' replaces 'Status'. First-person, includes the
  specific 'I shipped 23 connectors in the last week alone' and the
  scope statement without the templated 'It will not pretend to be
  a cluster' phrasing.
- FAQ rewrite: dropped 12 <details> blocks for a markdown Q&A
  format. Each answer is one or two paragraphs of real talk, no
  'Yes! Absolutely!' marketing energy. Includes the honest 'binary
  grew from 9 MB to 30 MB and here's why' admission, the 'how good
  is Duckie really' honest answer, the 'why DuckDB and not Polars'
  with specific reasons.
- Recipes section: pseudo-arrow recipes ('src.csv -> qa.not_null ->
  snk.parquet') replaced with 6 actual JSON pipelines that paste
  into a workspace file and run. Shows real props for each node.
- Binary size: fixed everywhere. 9 MB claim removed; replaced with
  the actual 27-30 MB range + a per-platform table + an explanation
  of what's in the binary vs what downloads to app-data.
- Bumped tauri.conf.json to 0.0.12 (Sourav skipped 0.0.11).

Author: SouravRoy-ETL