fix(scheduler): persist normalized URLs, expand tests, upgrade Go/tooling

[hyp3rd]

• Apply result.NormalizedURL back to request.URL and callback.URL so normalized values are used across scheduling, retries, and callbacks
• Add //nolint:G704 where appropriate

Tests

• Introduce helpers for retrier, TLS scheduler, retry-then-success and callback payload handlers
• Refactor TestRetrier_Validate to table-driven cases (valid, zero/invalid max retries, invalid backoff/interval/timeout, etc.)
• Update retry/timeout expectations and add assertion/wait helpers

Tooling/CI

• Enable golangci-lint tests in .golangci.yaml
• Bump Go to 1.26.0; update Makefile/.project-settings.env accordingly
• Upgrade golangci-lint to v2.10.1 and buf to v1.65.0
• Update pre-commit hooks to v9.7.0

Deps

• go.mod: go 1.26.0; github.com/hyp3rd/sectools v1.2.3; golang.org/x/net v0.50.0; golang.org/x/text v0.34.0
• Refresh go.sum

[Copilot]

Pull request overview

This pull request improves URL handling in the scheduler by persisting normalized URLs, refactors tests with helper functions and table-driven patterns, and upgrades tooling including Go 1.26.0, golangci-lint v2.10.1, and related dependencies. The changes ensure that URL normalization results from validation are consistently used across scheduling, retries, and callbacks.

Changes:

• Core functionality: Apply normalized URLs from validation results back to request.URL and callback.URL fields
• Testing improvements: Introduce reusable test helpers and refactor validation tests to table-driven format
• Tooling upgrades: Update Go to 1.26.0, golangci-lint to v2.10.1, buf to v1.65.0, and pre-commit hooks to v9.7.0

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/scheduler/scheduler.go	Apply NormalizedURL from validation results to request/callback URLs; add nolint directives for gosec
tests/scheduler_test.go	Extract test logic into reusable helpers (retrier, scheduler, handlers, assertions); improve test maintainability
tests/retrier_test.go	Convert validation tests to table-driven format with mutation functions; add timeout constants
go.mod	Update Go version to 1.26.0 and upgrade sectools, golang.org/x/net, golang.org/x/text dependencies
go.sum	Refresh checksums for updated dependencies
Makefile	Update tool versions to match project settings
.project-settings.env	Centralize tool version configuration
.pre-commit/unit-test-hook	Update Go toolchain version reference
.pre-commit/golangci-lint-hook	Update golangci-lint version reference
.pre-commit-config.yaml	Update cspell-cli pre-commit hook to v9.7.0
.pre-commit-ci-config.yaml	Update cspell-cli pre-commit hook to v9.7.0
.golangci.yaml	Enable linting for test files and update Go version

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[Copilot]

The return statement after t.Fatal is unreachable code. The t.Fatal call will stop test execution immediately, so the subsequent return will never be executed. Consider removing this unreachable return statement.

Suggested change

	return scheduler.CallbackPayload{}