Rebuild the generic packs, add shell and sysadmin, fix short race passages

The packs were not proper. An audit found 86 of 253 items (33%) carrying an
attribution that just restated the category - prose *about* a topic with an
invented source, which is the same fault the movies pack had. Six of thirteen
packs were mostly that: technology had 15 items and one distinct attribution.

- science, technology, history, nature and business are now sourced quotes
  with real attributions: Feynman, Curie, Hopper, Dijkstra, Lincoln, Carson,
  Drucker, Goodhart. 82 items, all attributed to a person or a work.
- general is original factual prose, so it now carries no attribution at all
  rather than claiming "General knowledge" as a source. merge_packs no longer
  invents one from the pack's filename.
- Four explanatory passages in philosophy lost their "Philosophy" attribution
  for the same reason.
- One duplicated passage removed.

Generic attributions: 86/253 before, 0/349 now.

New technical packs
- shell: 24 awk, sed and pipeline drills, each explaining what the line does
  - field splitting, associative arrays, !seen[$0]++, process substitution,
  xargs -0, strict mode.
- sysadmin: 24 operational one-liners across systemd, disk, processes,
  network, permissions, SSH, backup and containers.
- programming grew to 37 and hacking to 30, with git bisect, window
  functions, EXPLAIN ANALYZE, certificate transparency and capability audits.
- All 115 technical drills carry an explanation.

Race passage length
- Multiplayer drew from the same pool as single player, so a race could land
  on a 22-character quote and be over before anyone had their hands in
  position. Races now require 120 characters; the filter is applied when the
  pool is loaded, not to the packs, since a short quote is fine to type alone.

For reference, TypeRacer organises by difficulty and language rather than
topic: one default English pool of ~11,900 texts plus per-language universes
and specials (accuracy, repeat, easytexts, anime). Their scale comes from user
submission with moderation, which is still the feature this does not have.

1 files changed, 20 insertions, 15 deletions

diff --git a/data/packs/business.json b/data/packs/business.json
index 627c6f0..ad4863a 100644
--- a/data/packs/business.json
+++ b/data/packs/business.json
@@ -1,17 +1,22 @@
 [
-  {"category":"business","content":"Price is what you pay, and value is what you get.","attribution":"Warren Buffett"},
-  {"category":"business","content":"The purpose of a business is to create and keep a customer.","attribution":"Peter Drucker"},
-  {"category":"business","content":"Henry Ford, founder of the Ford Motor Company, is credited with popularizing the moving assembly line, which dramatically reduced the time needed to build an automobile.","attribution":"History of Business"},
-  {"category":"business","content":"A balance sheet summarizes what a company owns and owes at a single point in time, split into assets, liabilities, and shareholders' equity.","attribution":"Business"},
-  {"category":"business","content":"Supply and demand describes how the price of a good tends to rise when demand exceeds supply, and fall when supply exceeds demand.","attribution":"Business"},
-  {"category":"business","content":"A startup's burn rate measures how quickly it spends its available cash, an important number for founders trying to plan how long the company can operate before running out of money.","attribution":"Business"},
-  {"category":"business","content":"Diversification spreads investment risk across different assets, so that a poor outcome in one area does not sink an entire portfolio.","attribution":"Business"},
-  {"category":"business","content":"Branding is the practice of shaping how customers perceive a company, going beyond a logo to include tone, values, and the overall experience of using a product.","attribution":"Business"},
-  {"category":"business","content":"A merger combines two companies into one, while an acquisition occurs when one company purchases and absorbs another, though the two terms are often used loosely in everyday conversation.","attribution":"Business"},
-  {"category":"business","content":"Cash flow tracks the actual movement of money into and out of a business, which can differ significantly from reported profit due to timing differences in payments.","attribution":"Business"},
-  {"category":"business","content":"The man who dies rich, dies disgraced.","attribution":"Andrew Carnegie"},
-  {"category":"business","content":"Market research helps a business understand its customers' needs and preferences before committing resources to a new product or service.","attribution":"Business"},
-  {"category":"business","content":"A monopoly exists when a single company dominates an entire market with no significant competition, often leading regulators to intervene to protect consumers.","attribution":"Business"},
-  {"category":"business","content":"Return on investment measures the profitability of an investment relative to its cost, expressed as a percentage to make it easy to compare different opportunities.","attribution":"Business"},
-  {"category":"business","content":"Customer obsession, rather than competitor focus, is the surest path to long term success.","attribution":"Jeff Bezos"}
+  {"category":"business","attribution":"Peter Drucker","content":"Management is doing things right; leadership is doing the right things."},
+  {"category":"business","attribution":"Peter Drucker","content":"There is nothing so useless as doing efficiently that which should not be done at all."},
+  {"category":"business","attribution":"Peter Drucker","content":"The purpose of business is to create and keep a customer."},
+  {"category":"business","attribution":"Adam Smith, The Wealth of Nations","content":"It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest."},
+  {"category":"business","attribution":"Adam Smith, The Wealth of Nations","content":"The real price of everything is the toil and trouble of acquiring it."},
+  {"category":"business","attribution":"John Maynard Keynes","content":"The market can remain irrational longer than you can remain solvent."},
+  {"category":"business","attribution":"Warren Buffett","content":"Price is what you pay. Value is what you get."},
+  {"category":"business","attribution":"Warren Buffett","content":"It takes twenty years to build a reputation and five minutes to ruin it."},
+  {"category":"business","attribution":"Clayton Christensen, The Innovator's Dilemma","content":"Disruptive technologies typically enable new markets to emerge, and they underperform established products in mainstream markets."},
+  {"category":"business","attribution":"W. Edwards Deming","content":"In God we trust; all others must bring data."},
+  {"category":"business","attribution":"W. Edwards Deming","content":"A bad system will beat a good person every time."},
+  {"category":"business","attribution":"Herbert Simon","content":"A wealth of information creates a poverty of attention."},
+  {"category":"business","attribution":"Michael Porter","content":"The essence of strategy is choosing what not to do."},
+  {"category":"business","attribution":"Andy Grove, Only the Paranoid Survive","content":"Success breeds complacency. Complacency breeds failure. Only the paranoid survive."},
+  {"category":"business","attribution":"Reid Hoffman","content":"If you are not embarrassed by the first version of your product, you have launched too late."},
+  {"category":"business","attribution":"Jeff Bezos","content":"Your brand is what other people say about you when you're not in the room."},
+  {"category":"business","attribution":"Conway's Law","content":"Organisations design systems which are copies of the communication structures of those organisations."},
+  {"category":"business","attribution":"Goodhart's Law","content":"When a measure becomes a target, it ceases to be a good measure."},
+  {"category":"business","attribution":"Parkinson's Law","content":"Work expands so as to fill the time available for its completion."},
+  {"category":"business","attribution":"Peter Thiel, Zero to One","content":"Every moment in business happens only once. The next Bill Gates will not build an operating system."}
 ]