chore: make go.mod the single source of truth for the Go floor

CONTRIBUTING.md

@@ -13,7 +13,9 @@ Thank you for your interest in contributing to celeris!
 
 ### Prerequisites
 
-- Go 1.26.3+ (1.26.3 absorbs stdlib CVEs surfaced by govulncheck on 1.26.2: GO-2026-4971 in `net`, GO-2026-4918 in `net/http`)
+- Go 1.27.0+ — the `go` directive in `go.mod` is the single source of truth for the floor, and
+  CI pins the same version. Quote it from there rather than restating it here, so the two
+  cannot drift apart again.
 - [Mage](https://magefile.org) build tool: `go install github.com/magefile/mage@latest`
 - Linux (for io_uring/epoll engine tests) or macOS (std engine only)
 - [golangci-lint](https://golangci-lint.run/) v2.9+

README.md

@@ -61,7 +61,7 @@ A correctness-focused release. Three concurrency fixes on the WebSocket and engi
 go get github.com/goceleris/celeris@latest
 ```
 
-Requires **Go 1.26.4+**. Linux for the io_uring / epoll / adaptive engines; any OS for the std engine.
+Requires **Go 1.27.0+** (the `go` directive in `go.mod` is the source of truth). Linux for the io_uring / epoll / adaptive engines; any OS for the std engine.
 
 ```go
 package main
@@ -424,7 +424,7 @@ validation/     Runtime invariant assertions + validation hooks (debug builds)
 
 ## Requirements
 
-- **Go 1.26.4+**
+- **Go 1.27.0+** (see the `go` directive in `go.mod`)
 - **Linux** for the io_uring / epoll / adaptive engines (kernel 5.10+ for io_uring; 5.19+ for the multishot / provided-buffers tier)
 - **Any OS** for the std engine
 - Direct runtime dependencies: `golang.org/x/sys` and `golang.org/x/net` only (`golang.org/x/text` is indirect)

driver/memcached/client.go

@@ -30,7 +30,7 @@ type Client struct {
 //
 // addr may optionally include a "memcache://" or "memcached://" scheme
 // prefix; the prefix is stripped and the remaining "host:port" is used
-// verbatim. TLS is not supported in v1.4.0.
+// verbatim. TLS is not supported.
 func NewClient(addr string, opts ...Option) (*Client, error) {
 	addr = strings.TrimPrefix(addr, "memcached://")
 	addr = strings.TrimPrefix(addr, "memcache://")

driver/postgres/dsn.go

@@ -254,7 +254,7 @@ func applyDefaults(d *DSN) {
 // CheckSSL returns ErrSSLNotSupported if the DSN requests a TLS mode this
 // driver version cannot satisfy.
 //
-// In v1.4.0 the driver has no TLS stack. sslmode semantics:
+// The driver has no TLS stack. sslmode semantics:
 //
 //   - "" / "disable"         : plaintext, always allowed.
 //   - "prefer" / "allow"     : the libpq semantics are "try TLS, fall

driver/postgres/protocol/types_numeric.go

@@ -17,7 +17,7 @@ import (
 //   int16  dscale    display scale (number of digits after decimal point)
 //   int16  digits[ndigits]  base-10000 digits, MSD first
 //
-// Implementing a full arbitrary-precision encoder is deferred. For v1.4.0 we
+// Implementing a full arbitrary-precision encoder is deferred. For now we
 // decode into a canonical string form and require callers to pass a string
 // when encoding so the server parses it in text form.
 
@@ -138,7 +138,7 @@ func init() {
 		Name:         "numeric",
 		DecodeBinary: decodeNumericBinary,
 		DecodeText:   decodeNumericText,
-		EncodeBinary: nil, // binary encode not implemented in v1.4.0
+		EncodeBinary: nil, // binary encode not implemented
 		EncodeText:   encodeNumericText,
 		ScanType:     reflect.TypeOf(""),
 	})

driver/postgres/rows.go

@@ -207,7 +207,7 @@ func (r *pgRows) ColumnTypeDatabaseTypeName(i int) string {
 }
 
 // HasNextResultSet reports whether a multi-statement simple query produced
-// another result set after the current one. For v1.4.0 we flatten multi-
+// another result set after the current one. The driver flattens multi-
 // statement results into a single pgRows, so this is always false.
 func (r *pgRows) HasNextResultSet() bool { return false }
 

driver/redis/cluster.go

@@ -56,10 +56,10 @@ type ClusterConfig struct {
 	// error is returned. Default: 3.
 	MaxRedirects int
 	// RouteByLatency, when true, sends reads to the lowest-latency node.
-	// Not implemented in v1.4.0; reserved for future use.
+	// Not implemented; reserved for future use.
 	RouteByLatency bool
 	// ReadOnly, when true, allows reads from replica nodes.
-	// Not implemented in v1.4.0; reserved for future use.
+	// Not implemented; reserved for future use.
 	ReadOnly bool
 
 	Engine eventloop.ServerProvider

test/autobahn/README.md

@@ -27,7 +27,7 @@ each celeris engine.
 
 - Docker (for the Autobahn container — the project no longer ships
   native macOS binaries).
-- Go 1.22+ to build the celeris server.
+- A Go toolchain matching the `go` directive in the root `go.mod` to build the celeris server.
 - On Linux, `make autobahn` runs all three engines (std/epoll/io_uring)
   in parallel. On macOS only `std` is exercised.