feat: scoring and frecency (#37)

Enhance lookup mechanics and priority propagation (`spec/lookup.go`)
Remove the requirement of typing a leading `-` when searching for
options, allowing flag suggestions to surface naturally during input
Accurately forward the `Priority` field from registry specs into the
`Suggestion` struct so the scoring engine evaluates relevance properly

Integrate scoring into the main suggestion pipeline
(`root/suggestions.go`)
Collect context signals using `scoring.CollectSignals(cwd, query,
rootCmd, store)` with the live working directory retrieved from
`spec.GetCWD()`
Pass the entire deduplicated list across spec, history and AI items
through `scoring.Score(deduped, signals)` to compute scores and sort by
descending order before rendering on screen

Record execution history in Frecency Store (`root/wrapper.go`)
Save the last executed command to `lastSubmittedCommand` whenever Enter
is pressed or a suggestion is selected
Trigger `store.Record(...)` asynchronously within the `IRIS_CMD_STOP`
hook using a dedicated goroutine guarded by panic recovery and timeout
limits, preventing blocks on the main shell thread

Optimize workspace identification for AI
(`internal/ai/context_provider.go`)
Use `workspace.DetectCached(cwd)` to instantly fetch ecosystem context
across Git, Node, Go, Rust, Python and Docker alongside active git
branch state
This caching mechanism avoids redundant subprocess execution when
outside git repositories, significantly speeding up prompt context
generation

root/wrapper.go

@@ -22,6 +22,7 @@ import (
 	"github.com/versenilvis/iris/internal/ai"
 	"github.com/versenilvis/iris/internal/config"
 	"github.com/versenilvis/iris/internal/logger"
+	"github.com/versenilvis/iris/internal/scoring"
 	"github.com/versenilvis/iris/spec"
 	"golang.org/x/sys/unix"
 	"golang.org/x/term"
@@ -81,6 +82,7 @@ func restoreTerminal() {
 // coordinates between the shell process and the suggestion overlay
 func runWrapper() {
 	var naiveBuffer string
+	var lastSubmittedCommand string
 	cursorOffset := 0
 	var bufferMu sync.Mutex
 	var userNavigated atomic.Bool
@@ -323,6 +325,25 @@ func runWrapper() {
 			if query == "IRIS_CMD_STOP" {
 				isCommandActive.Store(false)
 				SetCurrentAISuggestion(nil)
+				bufferMu.Lock()
+				cmdToRecord := lastSubmittedCommand
+				lastSubmittedCommand = ""
+				bufferMu.Unlock()
+				if cmdToRecord != "" {
+					cwd := spec.GetCWD()
+					go func(c, d string) {
+						defer func() {
+							if r := recover(); r != nil {
+								WriteCrashLog(r)
+							}
+						}()
+						ctxRecord, cancel := context.WithTimeout(context.Background(), 1500*time.Millisecond)
+						defer cancel()
+						if store, err := scoring.GetFrecencyStore(); err == nil && store != nil {
+							_ = store.Record(ctxRecord, c, d)
+						}
+					}(cmdToRecord, cwd)
+				}
 				// hook: after user executes a command, print the update notice exactly once per session
 				if !updatePrinted {
 					select {
@@ -621,7 +642,7 @@ func runWrapper() {
 										historyList = append(historyList, results[j])
 									}
 								} else {
-									for j := 0; j < limit; j++ {
+									for j := range limit {
 										historyList = append(historyList, results[j])
 									}
 								}
@@ -759,9 +780,11 @@ func runWrapper() {
 				} else if b == 0x0d || b == 0x0a {
 					intercepted = true
 					logger.Debugf("Intercepted Enter key, navigated=%v", overlay.GetUserNavigated())
+					var cmdToSubmit string
 					if overlay.IsVisible() && overlay.GetUserNavigated() {
 						selected := overlay.GetCurrentCmd()
 						if selected != "" {
+							cmdToSubmit = selected
 							activeModeMu.RLock()
 							currentMode := activeMode
 							activeModeMu.RUnlock()
@@ -783,6 +806,10 @@ func runWrapper() {
 					isCommandActive.Store(true)
 					_, _ = ptmx.Write([]byte{b})
 					bufferMu.Lock()
+					if cmdToSubmit == "" {
+						cmdToSubmit = naiveBuffer
+					}
+					lastSubmittedCommand = strings.TrimSpace(cmdToSubmit)
 					naiveBuffer = ""
 					cursorOffset = 0
 					bufferMu.Unlock()