FORMULA ENGINE
==============

Reactive formula evaluation engine. Parses variable assignments
(addition), evaluates via dependency graph, tracks history,
detects cycles, and surfaces diagnostics.

https://git.bunk3r.dev/c0nrad/runway


HTTP API
--------

  GET  /state               Full state snapshot (all variables)
  GET  /variables/{name}    Single variable detail
  POST /statement           Process a statement (JSON body)
  POST /load                Upload a .txt file of formulas


Examples
--------

  Define variables:
    curl -X POST https://runway.bunk3r.dev/statement \
      -H 'Content-Type: application/json' \
      -d '{"statement": "a = 100"}'

    curl -X POST https://runway.bunk3r.dev/statement \
      -H 'Content-Type: application/json' \
      -d '{"statement": "b = 50"}'

    curl -X POST https://runway.bunk3r.dev/statement \
      -H 'Content-Type: application/json' \
      -d '{"statement": "c = a + b"}'

  Check the full state (c = 150):
    curl https://runway.bunk3r.dev/state

  Update a dependency (c recomputes automatically):
    curl -X POST https://runway.bunk3r.dev/statement \
      -H 'Content-Type: application/json' \
      -d '{"statement": "a = 200"}'

  Look up a single variable (history + diagnostics):
    curl https://runway.bunk3r.dev/variables/c

  Trigger an error (undefined reference):
    curl -X POST https://runway.bunk3r.dev/statement \
      -H 'Content-Type: application/json' \
      -d '{"statement": "x = unknown + 1"}'

  Circular reference:
    curl -X POST https://runway.bunk3r.dev/statement \
      -d '{"statement": "p = q"}'
    curl -X POST https://runway.bunk3r.dev/statement \
      -d '{"statement": "q = p"}'

  Upload a file of formulas:
    curl -X POST https://runway.bunk3r.dev/load \
      -F "file=@formulas.txt"