fix(sustainabot): parse-blocking OCaml-isms and HANDLE-keyword name (Refs #148) (#206)

## Summary

Two hand-port corrections after re-validating sustainabot's
ReScript→AffineScript files against the live `affinescript check`:

1. **OCaml-style float operators** `/.`, `*.`, `+.`, `-.` → AffineScript
`/`, `*`, `+`, `-`. AffineScript uses unified arithmetic operators for
Int and Float (see `examples/lessons/01_hello.affine`: `subtotal *
0.08`), so the OCaml separation was a hand-port artefact. Affected:
`GitHubApp.affine`, `Oikos.affine`, `Report.affine`.

2. **`handle` is a contextual keyword** in AffineScript (HANDLE token,
used in `handle body { handlers }` effect expressions), so it cannot be
a function name. Renamed `Router.affine`'s `pub fn handle(...)` → `pub
fn dispatch(...)`. The function dispatches a request to its matching
route handler — the rename is also more accurate.

## Gate

This PR's parse-time fix is fully effective only once the four parser
PRs gated on the same issue have merged:

- hyperpolymath/affinescript#370 (trailing-comma in fn params + expr
lists + effect-annotated lambda)
- hyperpolymath/affinescript#371 (fn-type with effect arrow in type
position)
- hyperpolymath/affinescript#372 (builtin/lowercase qualified paths +
TOTAL field name)
- hyperpolymath/affinescript#373 (underscore-prefix idents
`_key`/`_unused`)
- hyperpolymath/affinescript#376 (record-update spread at start)

## Test plan

- [x] After landing the 5 affinescript PRs + this PR: `affinescript
check` on all 13 sustainabot `.affine` files reaches at least Resolution
(no parse errors). 12 hit `Resolve.UndefinedModule` (stdlib not loaded
by the check), 1 (`tea/Sub.affine`) hit it from the start.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

bots/sustainabot/bot-integration/src/GitHubApp.affine

@@ -61,7 +61,7 @@ pub fn generate_jwt(
   app_id: ref String,
   private_key_pem: ref String,
 ) -{IO}-> Result<String, String> {
-  let now_seconds = Time::now_millis() /. 1000.0;
+  let now_seconds = Time::now_millis() / 1000.0;
 
   let header = json::encode_object([
     ("alg", json::encode_string("RS256")),
@@ -71,8 +71,8 @@ pub fn generate_jwt(
 
   let payload = json::encode_object([
     ("iss", json::encode_string(app_id)),
-    ("iat", json::encode_float(now_seconds -. 60.0)),
-    ("exp", json::encode_float(now_seconds +. 600.0)),
+    ("iat", json::encode_float(now_seconds - 60.0)),
+    ("exp", json::encode_float(now_seconds + 600.0)),
   ]);
   let payload_b64 = base64_url_encode_string(json::stringify(payload));
 
@@ -111,7 +111,7 @@ pub fn get_installation_token(
 
   match cache_get(cache_key) {
     Some(cached) => {
-      if cached.expiresAt > Time::now_millis() +. 60000.0 {
+      if cached.expiresAt > Time::now_millis() + 60000.0 {
         Ok(cached)
       } else {
         fetch_installation_token(jwt, cache_key)

bots/sustainabot/bot-integration/src/Oikos.affine

@@ -194,9 +194,9 @@ pub fn update(msg: Msg, model: Model) -{IO}-> (Model, Cmd::T<Msg>) {
 
     Tick => {
       let now = Time::now_millis();
-      let one_hour = 60.0 *. 60.0 *. 1000.0;
+      let one_hour = 60.0 * 60.0 * 1000.0;
       let pending = filter(model.pendingAnalyses, fn(a) -> Bool {
-        now -. a.createdAt < one_hour
+        now - a.createdAt < one_hour
       });
       (Model #{ ..model, pendingAnalyses: pending }, Cmd::none())
     },

bots/sustainabot/bot-integration/src/Report.affine

@@ -91,7 +91,7 @@ pub fn generate_pr_comment(analysis: ref AnalysisResult, mode: ref BotMode) -> S
       let top_recs = Array::slice(analysis.recommendations, 0, max_recs);
 
       let rec_lines = map(top_recs, fn(r) -> String {
-        let confidence = Float::to_int(r.confidence *. 100.0);
+        let confidence = Float::to_int(r.confidence * 100.0);
         "- **" ++ r.action ++ "** (" ++ Int::to_string(confidence)
           ++ "% confidence): " ++ r.reason ++ "\n"
       });

bots/sustainabot/bot-integration/src/Router.affine

@@ -125,11 +125,11 @@ pub fn not_found(router: Router, handler: Handler) -> Router {
   Router #{ ..router, notFoundHandler: Some(handler) }
 }
 
-// `handle` walks routes to find a method+path match and invokes its
+// `dispatch` walks routes to find a method+path match and invokes its
 // handler under the middleware chain. The mechanical migrator must
 // re-express this once the canonical Http::Request shape and
 // Array::iter / Array::fold_right externs are bound.
-pub fn handle(router: ref Router, req: Http::Request) -{IO}-> Http::Response {
+pub fn dispatch(router: ref Router, req: Http::Request) -{IO}-> Http::Response {
   // TODO(mechanical-migrator): re-implement against canonical Http::Request
   // shape. Stubbed to a 501 so the file parses.
   Http::not_implemented(req)