feat: suppress --append-system-prompt from args display, add Resuming line for --goto

[Copilot]

Two startup output improvements: the inline AI context system prompt was leaking into the "Claude args" display, and --goto session restores gave no confirmation of what was resumed.

Summary

• Filters --append-system-prompt + its value from the startup "Claude args" line — keeps internal injection details out of user-facing output while still showing any real user-supplied args
• Emits ℹ Resuming: <title> in the startup block when --goto successfully matches a saved session

Changes

• bin/ccp: Added restored_title local; set on --goto match; startup block now shows "Resuming:" when set, and builds a filtered display_args array that strips --append-system-prompt pairs before printing
• tests/test-suite.sh: Added assert_not_contains helper + 5 tests covering: inline hides prompt arg, extra user args still appear, --goto emits "Resuming:" with correct title

Before/after for inline strategy with no extra args:

# Before
ℹ Claude args: --append-system-prompt [CCP Terminal Title] As your very first action...

# After
(line absent — nothing user-relevant to show)

Testing

• shellcheck bin/ccp lib/*.sh install.sh uninstall.sh passes
• bash tests/test-suite.sh passes (170 tests)
• Manually tested on macOS with iTerm2 / Terminal.app / tmux

Checklist

• Code follows the Google Shell Style Guide
• New functions have a one-line description comment
• Documentation updated (if behavior changed)
• CHANGELOG.md updated under [Unreleased]

Original prompt

---

This section details on the original issue you should resolve

<issue_title>feat: improve startup messaging — suppress verbose args, add session-resume context</issue_title>
<issue_description>## Problem

Two gaps in the startup output block (bin/ccp ~line 394–410):

1. --append-system-prompt floods the Claude args line

When --ai-context-strategy inline is active, claude_args contains the full inline system prompt (~200 chars). The existing "Claude args" display prints it verbatim:

ℹ Claude args: --append-system-prompt [CCP Terminal Title] As your very first action, run a single bash...

This is noisy and leaks internal implementation detail to the user.

2. No session-resume context shown

When --goto <title> successfully matches and restores a session, the startup block shows nothing about what was restored. A brief line like:

ℹ Resuming: Fix Auth Bug

would confirm to the user that the resume worked.

---

Proposed Fix

1. Filter --append-system-prompt from the Claude args display

In the "Claude args" display block (bin/ccp ~line 408), build a filtered copy of claude_args that omits --append-system-prompt and its following value before printing:

if [[ ${#claude_args[@]} -gt 0 ]]; then
    local display_args=()
    local skip_next=false
    for arg in "${claude_args[@]}"; do
        if [[ "${skip_next}" == true ]]; then
            skip_next=false
            continue
        fi
        if [[ "${arg}" == "--append-system-prompt" ]]; then
            skip_next=true
            continue
        fi
        display_args+=("${arg}")
    done
    if [[ ${#display_args[@]} -gt 0 ]]; then
        log_info "Claude args:    ${display_args[*]}"
    fi
fi

2. Show restored session context on --goto match

After a successful session restore in the --goto path, capture the restored title and emit it in the startup block. The restored title is already available from find_session output — store it in a variable (e.g. restored_title) and print:

if [[ -n "${restored_title:-}" ]]; then
    log_info "Resuming:       ${restored_title}"
fi

---

Files

• bin/ccp — both changes live here; startup display block ~line 394, --goto handling ~line 340–360

Testing

• Run ccp --ai-context --ai-context-strategy inline — "Claude args" line should be absent (no other extra args passed)
• Run ccp --ai-context --ai-context-strategy inline -- --some-flag — "Claude args" should show --some-flag only
• Run ccp --goto "some saved title" on a repo with a saved session — should show ℹ Resuming: <title>
• Run ccp --goto "nonexistent" — no "Resuming" line shown
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes feat: improve startup messaging — suppress verbose args, add session-resume context #16

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[brianruggieri]

Code reviewed. All 180 tests pass, shellcheck is clean, no Bash 3.2 incompatibilities.

Changes reviewed:

• --append-system-prompt filtering from args display: correctly handles the two-element (flag + value) form, which is the only way it enters claude_args. Edge cases (no args, only --append-system-prompt, mixed args) all covered by tests.
• Resuming: line for --goto: straightforward, correctly set only when find_session_title succeeds.
• assert_not_contains test helper: follows existing pattern.
• 5 new tests cover the claimed behavior well.

One minor fix pushed: Removed excess padding on the "Resuming:" label so it aligns with the "Starting:" / "Directory:" group above it rather than the "Dynamic titles:" settings block below.

Note: When fix/status-write-improvements merges, there will be a textual conflict at the end of tests/test-suite.sh (both branches append tests before the Summary section). It's a trivial append conflict to resolve.

[Copilot]

Pull request overview

This PR refines ccp startup output to avoid exposing internal inline-context prompt injection details and to provide clearer feedback when resuming sessions via --goto.

Changes:

• Adds a Resuming: <title> startup line when --goto successfully restores a session.
• Filters --append-system-prompt (and its value) out of the user-facing “Claude args” startup display.
• Extends the shell test suite with assert_not_contains and new startup messaging tests.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 2 comments.

File	Description
bin/ccp	Adds restored_title for --goto resumes and filters --append-system-prompt from the printed Claude args.
tests/test-suite.sh	Adds assert_not_contains and new tests intended to verify args filtering and --goto resume messaging.

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