Require explicit resource IDs for targeted commands

[leo-notte]

Summary

• require explicit session IDs for session, page, and session-backed file commands
• require explicit function IDs for function resource commands
• remove current-session and current-function inference and persistence
• keep cleanup support for legacy stored resource pointers
• update CLI examples and tests for explicit IDs

Testing

• go test ./...
• go test -c -tags integration -o /tmp/notte-cli-explicit-resource-ids-integration.test ./tests/integration
• golangci-lint pre-commit hook
• missing-ID behavioral smoke tests

[greptile-apps]

Greptile Summary

This PR removes persisted and environment-based session/function targeting in favor of explicit resource ID flags.

• Requires --session-id across session, page, and session-backed file commands.
• Requires --function-id across function resource commands.
• Removes current-resource inference, persistence, and session replacement behavior.
• Retains cleanup for legacy pointer files and updates documentation, unit tests, and integration tests.

Confidence Score: 5/5

The PR appears safe to merge with explicit resource-ID requirements consistently applied across the targeted commands.

The changed command registrations, handler guards, source resolution, legacy cleanup paths, documentation, and tests align with the intentional removal of implicit resource targeting, with no actionable regression identified.

Important Files Changed

Filename	Overview
internal/cmd/sessions.go	Removes implicit session resolution and persistence, marks every session-targeting command's ID flag required, and fetches viewer URLs for the explicitly selected session.
internal/cmd/functions.go	Removes implicit function resolution and persistence while consistently requiring function IDs on targeted commands.
internal/cmd/page.go	Makes the inherited session ID flag required for all page actions and updates command examples.
internal/cmd/files.go	Enforces explicit session IDs only for session-backed list and download operations while preserving uploads behavior.
internal/cmd/clear.go	Consolidates cleanup of all five historical resource-pointer files without changing the prior fail-fast error semantics.
internal/config/config.go	Removes constants for resource ID environment variables and persisted current-resource files that production commands no longer use.
README.md	Updates session, page, function, and file workflows to capture and pass resource IDs explicitly.
tests/integration/functions_test.go	Replaces implicit function-ID integration coverage with explicit missing-flag behavior coverage.
tests/integration/page_commands_test.go	Adds integration coverage verifying page commands reject a missing session ID.

_{Reviews (1): Last reviewed commit: "Require explicit resource IDs" | Re-trigger Greptile}

[leo-notte]

Closing because the intended scope is the agent skills and examples only; the CLI should retain its current inferred-resource behavior.